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University of Wales, Aberyswyth

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1. E Select Your Options TERM1 IT406 JAVAPROGRAMMING v 2003 Update from server Retrieve from server E Analyse Set Grade for Student at Ga 1212PM AStart A a pe loo Rai Mua See PEA SP Acknowledgement for analyzing projects ME JAVA BEE YAMM G crawler dat C PMSery AMMING crawler dat C PMSery d 04 NITA406 JAVA PROGRAMMING crawler dat J4 TT406 in tt Sat 1 r dat C IT406 JAVA PROGRAMMING crawler dat C PHServ AMMING cr awler dat JAVA PROGRAMMINGNcra A dad C NPMSeru N rawler dat ov 14 13 00 39 SGT 2 e from server rieve from server Set Grade for Student Mstart A e A Sidesion nai iava ava Sic Poe Tot ae 1 00PM 83 View Comments TX Ls File Help u Lecturer View Da Lecturer View a Thu Dec 18 23 45 09 SGT 2003 Student Project Details StudentlD StudentName Lecturer ProjectTitle DateSubmitted Grade Comn 123456788 Gulas Mr Frank jProjectManager Dec 18 2003 23456789 iVidgi Mr Frank iDemoMenu Dec 18 2003 345578912 Raji Mr Frank Display Menu Dec 18 2003 Project Summary To add and delete function Select Your Options TERMS v IT406JAVAPROGRAMMING v 2003 Update from server Retrieve from server Analyse SetGrdeforstulen start A e a a Greil mo
2. Second Marker View and New Store grade Levell DFD 50 Appendix 3 Requirement Catalogue ID Description 01 Getting connected to Server 02 Getting acknowledgement from Server 03 Password checking 04 Create login Screen for Student and Lecturer 05 Allow submission of projects for students 06 Validate all field 07 Getting acknowledgement for project submission 08 Validate Reset Field 09 Allow Lecturer to view projects 10 Validation on Lecturer Screen 11 Allow Lecturer to edit grade 12 Allow Lecturer to analyze the projects 13 Pop up screen to indicate analyze is complete 14 Allow Lecturer to update the status 51 Appendix 4 Data Dictionary 4 1 Student Input Specifications Field Format Student ID AlphaNumeric StudentName Alphanumeric no length limit LecturerName Alphanumeric no length limit ProjectTitle Alphanumeric no length limit ProjectSummar y Alphanumeric no length limit Generate examination confirmation list Term Standard selection eg Term1 term2 Term3 Tterm4 Module Standard Selection that is fixed eg IT406 Java Programming IT413 Oracle ProjectFile A single project documentation file in Binary format No size limit All the source files in a source directory inclusive of all directories relative to this b Project Sources directory 4 2 Lecturer Input Specifications
3. class to hold information for each student project SubmitServer StudentName Studentld Lecturer ProjectTitle ProjectSummary Term Module CurDate ProjectFilePath 58 SourceDirectory Connection PassHandler getSourceBaseDirectory getSourceDirectory resetcon submitProjFile senBinFile class that handles the submitting of project from studentscreen to the server Password Relationship ClientPass byte result byte buser byte bpass byte temp Random ranobj Setcon Scramble Cleanup ClientPass class to handle password authentication with the server it extends our base Password class ServerThread 60 Crawler String PATH String classpat Vector myvect Pattern mthp Pattern classp crawlFile 2 new Vector private int crawlent run t buildCrawl getCrawlResults compareCrawl t crawIWriteResults This is our ai class called crawler to actually search through our server data directory It will find all student folders and go into each modules folder in each student folder analyse the source files found in the source folder in each module folder and generate a unique signature for each module Then it will compare such signature files in an attempt to determine whether there is any plaigarism The result
4. Sidesion gava Sarai Bava mai Not Ea hd Gp 11 52 AM Acknowledgement from Server V MS DOS Prompt BENE For Help click Help Topics on the Help Menu Mstat A e A a Sesion Move Sorat Mso scen AAS 11 55am 80 Lecturer Screen __StudentiD StudentName Lecturer ProjectTile DateSubmited Grade Comments 40800020789 TestStudent TestLEcturer Heat Analysis so Nov 14 2003 100Example Comme rt 3808 7 Nov 14 2003 0 93808 Nov 14 2003 0 Nov 14 2003 0 View Projects from Server 81 gt Froject Manager x File Help Lecturer View m3 Lecturer View Fri Nov 14 12 53 06 SGT 2003 Student Project Details l StudentiD StudentName Lecturer ProjectTile DateSubmitted Grade Comments 123456789101 Ravi Raji ProjectManager Nov14 2003 60 123456788102 Guas al To Display Record 03 850 OCP Server 123456789103 Vignesh Raji To add record Nov 14 2003 0 1 0CAPMServert Project Summary Edit recorsEdit recors Select Your Options TERM1 IT406 JAVAPROGRAMMING 2003 v Update from server Retrieve from server Analyse Set Grade for Student Astr A e A Desin CyRai dave igava Sito Si Proi
5. Client receive message error e 66 j return msg method to send an array of binary data public boolean send byte dat try out write dat 0 dat length out flush catch IOException e System err printIn Client Send binary dat IOException e return false return true method to close the input and output socket streams public void reset try out close in close catch IOException e j System err printIn Client connection closing error e y 67 method to receive binary array public int receive byte buf int stat 0 try stat in read buf catch IOException e System err printIn Error receiving binary file e return 0 j return stat method to close and to cleanup the connection public void cleanup try out close in close catch IOException e System err printIn Client Socket cleanup error e j A finalize method for Clientconnection protected void finalize throws Throwable cleanup 68 Code for Server connection our main server class used for listening for incoming connection ProjectManager Copyright Raji 2003 package projectmanager import java io import java net import java util Date public class Server private int port 5001 Default port will be set at 5001 private ServerSocket serversock private Str
6. Rast nta Td Gp 1254 PM Retrieve Projects from Server E File Help Lecturer View 1 Lecturer View amp Open x Lookin PMServer ce c B8 123456789101 Vigi CI 123456789101 134567092098 Gul 156789023486 Ra 13456789201 12 9101 Vigi C 134567892098 13456789201 Ra 156789023456 72003 Fri Nov 14 12 06 24 SGT StudentlD H Comments 60 70 1 OCAPMServent 801 0C PMServeri1 0 mange projecs File Name C1PMServer ME Files of Type All Files Update from server Retrieve from server Set Grade for Student F Analyse Aser A Sa a de Mia cuni Ma S09 Miser f Se Not GES ea FS 12 1 PM Analyse Projects File Help Lecturer View Wil ecturer View Fri Nov 14 12 06 24 SGT 2003 Student Project Details StudentlD StudentName Lecturer SABES egestas iS Grade Comments 12345F 200404 rianan nas Tien aah a PEET cn 134567 Bas Ad odd Sher c i soree fi Analyse Command has been sent to the server ent 134567 Please click on update after some time has elapse and look at the comments field for results of the analysis Please note that there are large amount of projects and it will take some time before results are generated You are only allowed to start this analyse process once per session oman
7. 23 23 23 24 3 6 Password Encryption Scheme 3 6 1 Password and userid File Storage 3 6 2 Password and userid transmission CHAPTER 4 Coding and Testing 4 1 Coding 4 2 Testing CHAPTER 5 Evaluation and conclusions 5 1 System Evaluation 5 1 1 Evaluation against Requirements Specification 5 1 2 Evaluation against Original System a2 Known bugs and issues not resolved in this release 5 3 Strengths and weaknesses of the system 5 3 1 Strengths 5 3 2 Weaknesses 5 4 The development method References Appendices Appendix 1 Sample Questions Appendix 2 DFD Appendix 3 Requirement Catalogue Appendix 4 Data Dictionary Appendix 5 Class Diagram Appendix 6 Sample Source Code Appendix 7 Test Cases 25 25 25 30 30 42 42 43 43 43 43 44 44 45 46 48 51 52 53 66 77 vi 1 Introduction 1 1 Introduction The Institute for Computer Studies later Informatics was established in 1983 in recognition of Asia s economic growth fostering tremendous demand for skilled Information Technology IT manpower and knowledge based workers to build and sustain the rapid economic development in the region In 1995 The Institute became an independent company and has since formed strategic training alliances with major software vendors including Microsoft Lotus Oracle Corporation and Sun Microsystems Informatics started in 1983 from humble beginnings with only one Informatics Computer School in Singa
8. Data Dictionary A mixture of tools was used because each has their own strength and weaknesses DFD model both the flow of data and external information while sequence diagram provide more detailed analysis of how external sources interact within the system Following these two stages a set of requirements can be drawn up depicting the desired functionality of new system The following two subsections outline the main functional and non functional requirements 2 5 1 Functional requirements Students will be able to 1 login the system as a student with respective password 2 identify themselves with their names and 12 digit ID and the lecturer name 3 select the module for which they are submitting their project 4 submit their project as a single folder This folder can have any number of files 5 getthe confirmation that the project has been correctly submitted Lecturers will be able to 6 login to the system as a lecturer with respective password 7 view the lecturer screen 8 retrieve students projects for a particular module term and year 9 grade the project 10 analyse the project for plagiarism 11 receive comments for the particular project from the server Security All users are required to log into the system with password Data store A mechanism for bulk inputting user data must be provided 2 5 2 Non Functional Requirement All applications are stored in text files Upload time must be reasonable Informatio
9. Test that the JfileChooser will pop up with the message asking for a place to store the student projects when a lecturer selects a particular project to be retrieved 21 Lecturer Screen Test that the lecturer can edit the grade column and the comments 22 Lecturer Screen Test that when the Lecturer click on the set grade button the student s grade will be updated on the server 23 Test that when the Lecturer clicks on the analyse button AI crawler is started on the Server 24 Lecturer Screen Test that a pop up message will be appeared saying to wait and also informs that only one analysis can be made per session 25 Lecturer Screen After analysis when the lecturer clicks on update again the comments column will show the analysis result The main test cases are shown below The detailed test cases can be referred appendix 7 33 Login Screen E File Hel Auto nf Welcome to Project Manager Projects Submission Login Username Password Login Exit Asaj A e c es wo Sm em cun g Sm Ble Te gaa 121900 34 Student Screen 35 Lecturer Screen StudentD StudentName Lecturer ProjecTile DateSubmited Grade Comments 010800020789 TestStudent TestLEcturer HeatAnalysissoft Dec19 2003 100Example Comme Eoo poll ee amp 203 1 1 0
10. public ClientConnection ReadConfig rcfg new ReadConfig client cfg rcfg readCFile read the port and host from the client configuration file hostname rcfg getHost get the host port rcfg getPort get the port try clientsock new Socket hostname port create a new socket with host and port out new DataOutputStream clientsock getOutputStream get an output stream from the socket in new DataInputStream clientsock getInputStream get an input stream from the socket catch IOException e System err printIn Client connection initialization error e Second Constructor that takes a setting for hostname and port number public ClientConnection String host int port 65 hostname host this port port try clientsock new Socket hostname port out new DataOutputStream clientsock getOutputStream in new DataInputStream clientsock getInputStream catch IOException e System err printIn Client connection initialization error e method to send a message to server public boolean send String message try out writeUTF message catch IOException e System err printIn Client Send message IOException e return false return true method to receive a message from the server public String receive String msg null try msg in readUTF catch IOException e System err printIn
11. 2 4 1 Requirements Catalogue amp Data Dictionary For the developer to begin the production of the final artefact a comprehensive list of all the data items including structure type length etc was required as well as a list of processes to be carried out by the system From reading around various development methodologies the developer has sought to employ a variety of techniques to record this vital information As ongoing almost running list I have used the idea of the requirements catalogue to record requirements as they were identified which as well as a textual description of the catalogue entry will have a defined priority as well Weaver et al 1998 and can be seen in appendix 3 The data items themselves have been documented and will be stored in the data dictionary Appendix 4 which has been carried by building on the concept of the Gane amp Sarson style owing to the developers previous academic experience on the work of Garry Griffiths 1998 2 4 2 New System Requirements My application Project Manager is based on the client server model Currently one of our online education Purpletrain using this technique Purpletrain is purely an online education system The student is taught online and they will be submitting their project online The Purpletrain system can support the requirement of central repository for the new system project Manager The first option was to get the support from Purpletrain for the submiss
12. Function ReadConfig For parsing the configuration files of client and server Password For providing the basic pass encryption features StudentProject A class for holding the details of a single student project Besides these three main group of classes I have also included a utility called PasswordCreator This is a java program that allows the creation of encrypted userid and password file This can be used to generate the serverpass cfg file 3 2 Input Specifications The following table shows the input data that a student can enter at the student screen front end 20 3 2 Student Input Specifications Field Format StudentID 12 numeric digits StudentName Alphanumeric no length limit LecturerName Alphanumeric no length limit ProjectTitle Alphanumeric no length limit Alphanumeric no length limit Generate examination ProjectSummary i ye confirmation list Term Standard selection eg Term1 term2 Term3 Tterm4 Module Standard Selection that is fixed eg IT406 Java Programming IT413 Oracle ProjectFile A single project documentation file in Binary format No size limit f All the source files in a source directory inclusive of all Project Sources E E directories relative to this base source directory 3 2 2 Lecturer Input Specifications Field Format Grade Integer Comments Alphanumeric Unlimited length An auto generated data field that
13. Server Processing For the server processing of project Manager there will be a default data directory where all the student projects will be stored When the server starts up it will read its configuration file getting the port number that it listens as well as the path for the data directory to use If the directory doesn t exist it will be created The default name that I use for this directory is PMServer When a student submits project a folder will be created for this student under the data directory The name of this student folder will be 12 digit studentid that the student has entered Hence it is very important for the front end GUI to check this 12 digits input to prevent malicious attempts to overwrite important system folders and files Within this 12 digit student folder a module folder will be created to store project that the student is submitting Besides creating these data folders the server also needs an index So that again makes use of the OS file hierarchy system The Server would get the data and time which the project is submitted This date is actually entered when a student connects to the server Hence the student can t cheat on the project submission date by modifying the system clock from which PC he is submitting When student submits a project it would send the time back to the user The server would extract 4 digit year from this timestamp and use it to create a year folder under the top level data folder T
14. be broken down into two sections One is the secured storage of userid and password file Second is the transmission of secured userid and password through network The linux and Unix System influences the first section The second is influenced by Yahoo com 3 6 1 Password and userid File Storage In Linux the userid and password are stored in etc password file These files are secured and only can be read and written by the root user Modern Linux and Unix offers additional password protection scheme called Shadow Password Which I am not going to go in detail In the etc password file the userid is plainly visible but the password is encrypted This is what I would do for my password file Also the server should be running in an operating system that offers file and directory level security This will allow access permissions to be set on the server password file providing added security But for demonstration purpose Windows 98 95 would be sufficient Here I have chosen Message Digest 5 as the encryption mechanism for passwords Message digest 5 simply processes an input stream of bytes can be text or binary and generates a unique 16 byte signature digest for the given input It is believed that there are no two inputs with the same digest much like our finger prints no two human having the same prints Another characteristics md5 is that given a digest it is not possible to know what input generated the digest The meaning of thi
15. class match followed by method match forms a single line but as an example I have included some from each class to give a mini view or what Crawler dat is really about 27 PassWordCreator java Class PassWordCreator PassWordCreator java Class to PassWordCreator java Method PassWordCreator PassWordCreator java Method catch PassWordCreator java Method catch MyTableModel java Class MyTableModel MyTableModel java Method MyTableModel MyTableModel java Method MyTableModel MyTableModel java Method for MyTableModel java Method getColumnCount MyTableModel java Method getRowCount MyTableModel java Method getColumnName StudentScreen java Class StudAction StudentScreen java Method StudentScreen StudentScreen java Method actionPerformed StudentScreen java Method if StudentScreen java Method if SubmitServer java Method submitsourcefile SubmitServer java Method for SubmitServer java Method resetcon SubmitServer java Method submitprojectfile SubmitServer java Method for SubmitServer java Method sendBinFile SubmitServer java Method while SubmitServer java Method if SubmitServer java Method while SubmitServer java Method LecturerScreen java Method browseSave LecturerScreen java Method if LecturerScreen java Method show Warning LecturerScreen java Method valueChanged LecturerScreen java Method if This is the unique signature of some sources of project manager It is highly unlikely that someone else could have the same exact signature file unl
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17. entities The evolution of ERD typically progresses either from scratch or it is reverse engineered from existing database schema It supports various stages of development beginning with support various stages of development beginning with a user readable form that allows validation of design and is used by developers to validate a design at summary levels Many developers and CASE tools still use Bachman s crowfoot notation to indicate the cardinality of relationship The relationship type is written on or near the line that represents a relationship 2 4 Data Flow Diagram DFD assists in the functional decomposition process There are different notations and standards are available For my project I am using Yourdon notation and standard The attributes of Yourdon notation is as follows Two parallel horizontal lines represent a data store Processes are represented by a circle 1 2 3 Rectangular or square boxes to represent Input 4 Directed arrow to represent data flow 48 Student Acknowledg ement Hardcopy project Results Moderator Final Grade Project Manager Hardcopy project v Lecturer Project Grade Hardcopy project Comments Second Marker Project grade Level0 DFD 49 Submit project Project Final Grade Hardcopy store View and grade Exam division
18. in my Introduction I have done the coding by using Java Jdk 1 4 1 The main reason for using Java is I am more familiar and comfortable with Java other than any other language And also I was able to integrate AI with Java I have done the Design and coding concurrently The language is chosen based on the following characteristics Ease of design to code translation Compiler efficiency Source code portability Maintainability Although there are many new and better programming languages sometimes it could also be better to choose a weaker old language that has solid documentation and support software is familiar to everyone on the software development team and has been successfully applied in the past It is true in my case since I have done a small project on Java for my CSM1020 module that gave me the confidence to use Java 4 2 Testing Testing the artefact of systems development whether it is hardware or software is always an important activity however it is often squeezed to the end of the project due to the enforced pressures of time upon a project Cheffey et al 2003 It is a renowned fact that no system is built without containing few bugs but if the identification of these errors goes unnoticed then the chances of successful project will have been severely hindered Jordan et al 1990 As I am aware of the importance of testing the artefact from the very start of the project and one of the main reasons for adapting the Li
19. to 50 participating students and lecturers Open and closed questions were used Questionnaire research design proceeds in an orderly and specific manner Each item in the flow chart depends upon the successful completion of all the previous items Therefore it is important not to skip a single step Notice that there are two feedback loops in the flow chart to allow revisions to the methodology and the instruments Define Goals and Objectives Design Methodology Determine feasibility Develop Instruments Select Samnle Conduct Pilot Test Revise Instruments Conduct Research Analyze Data Prepare Report 2 3 1 Things to take note of when using Questionnaires Too much often some people are using the questionnaire as a means to gather ideas In doing so they hope to find clues which will enable them to go further down the road Such a perspective is a total loss of time and energy It will never be repeated enough if you do not have any measure the construction of the tool is premature Many researchers underestimate the time required to complete a research project The following form can be used as an initial checklist in developing time estimates The best advice is to be generous with your time estimates Things always take longer than we think they should Task Hours Used Goal Clarification 2 Overall Study design 2 Selecting Sample N A Write the cover Letter 0 5 Conduct Pilot T
20. when Each document comes with a floppy or a CD that contains the sources Floppies are easily damaged and not a reliable storage Both floppies and CD ROMs can also be misplaced If each project needs to be reviewed by a second marker there will be the problem of transporting the stacks of documentation to the reviewer As it is a modular based programme it is possible for someone who has completed a module to pass on a copy to his fellow classmate who has not done the module There is nothing wrong with such exchanges if proper recognition is given to the work of others In fact such exchanges of ideas and information could improve the overall academic standard However the problem arises when the student misuses it Rather than using such material as references someone could possibly copy much of the materials and pass it off as his or her work The above points highlight some of the problems with the current system My project will attempt to build a Java based application that could offer a solution to some of the points above I call my application Project Manager And henceforth all references to my application will use this name Acknowledg eiarit Hardcopy Student project Lecturer Project Grade Project Manager Hardcopy project Second Marker Hardcopy project Final Grade Moderator Comments Project grade Context data flow diagram Fig 2 1
21. C PHServer 23456 789 1T406 JAVA PROGRAMMING crawler dat C PMServer 1 23456 789 IT406 JAVA PROGRAMMING crawler dat First module is C PMServer 23456 789 1IT406 JAVA PROGRAMMING Second module is C PMServer 3456 78912 1T406 JAVA PROGRAMMING Comparing C PHServer 23456 89 1T406 JAVA PROGRAMMING crawler dat C PMServer 456 78912 1IT406 JAVA PROGRAMMING crawler dat Current in is C PMServer 3456 78912 1T406 JAYA PROGRAMMING crawler dat crawlFile size is 3 First module is C PMServer 3456 78912 1T406 JAYA PROGRAMMING Second module is C PMServer 123456 789 IT406 JAVA PROGRAMMING omparing C PMServer 3456 78912 11T406 JAVA PROGRAMMING crawler dat C PHServer 123456 789 1T406 JAVA PROGRAMMING crawler dat First module is C PMServer 3456 78912 1T406 JAVA PROGRAMMING Second module is C PMServer 23456 789 1T406 JAYA PROGRAMMING Comparing C PMServer 3456 78912 1TT406 JAVA PROGRAMMING crawler dat C PHServer 23456 789 IT406 JAVA PROGRAMMING crawler dat Thread 9 Crawling completed at Thu Dec 18 23 46 04 SGT 2003 pdate trom server reve trom Server Set Grade for Student Start A eg Gai M Do SmMs Tes MB JA aval E gt Proj PIARA T 11 46PM 39 View comments a File Help Lecturer View H3 Lecturer View M Thu Dec 18 23 45 09 SGT 2003 Student Project Details StudentlD StudentName Lecturer ProjectTitle DateSubmitted Grade Comn 123456789 Gul
22. Crawler It search all the different folders of each student looking at the sources and generating a signature file called crawler dat To make it simple I took only class and method signature I have used two patterns for matching one for class and the other for method The code snippets is from Crawler class and shows the regular expressions patterns for the class and method private String classpat class s a zA Z0 9 s pattern for class private String method _a zA Z _a zA Z0 9 s C s pattern for method The pattern for searching for class is any string that contains the word class followed by at least one white space or more and then any alphanumeric characters one or more times I found that this pattern allows to pick up classes easily Next is pattern for matching method Any alphabets underscore dollar sign followed by any alphanumeric or underscore or dollar sign zero or more times followed by a white space zero or more times followed by an open bracket and any characters in between followed by closed bracket followed by a white space zero or more times followed by curly bracket eu While the first class pattern 1s able to pick up classes nicely but this second pattern for method doesn t pick up method as clean as class The reason is things like IOException e while true System out printIn Kdofa etc do appear sometimes However since I am using both patterns together
23. Default Login for Student is username Student password password Default Login for Lecturer is username Lecturer password password By using password creator utility the default password could be changed to any password But the user name should be Student or Lecturer A mini AI engine that allows the system to warn the lecturers of possible plagiarism Based on the hit rate the lecturer could conclude the possible plagiarism For lower figures like 10 to 20 it should be reasonable This is because of the way the AI engine works As explained in the previous section the crawler dat signature could have some common lines such as try catch etc Non Functional requirements Every non functional requirement that was set in the requirements specification was achieved in the final system As per requirement the upload time was reasonable and information was viewable by Lecturers 42 From the beta testing that was carried out after the system has been installed each member of the team agreed that the system was simple and quick to use The only drawback was the time taken to analyse the projects when the number of project is increased It allows the lecturer to keep track of the information such as name id submission date etc All the information was stored in a text file which was created under different userid 5 1 2 Evaluation against Original System The original system or the manual system that were used to manage project su
24. ER J A GEORGE J F and VALACICH J S 2002 Modern System Analysis amp Design 3 ed Prentice Hall 8 IVOR HORTON 2000 Beginning Java 2 Work Press 9 JOSEPH P BIGUS and JENNIFER BIGUS 2001 Constructing intelligent agents with Java 10 PRESSMAN R S 2000 Software Engineering A practitioners approach 5 ed McGraw Hill 11 WEAVER P L LAMBROU N and WALKLEY M 1998 Practical SSADM Version 4 A complete Tutorial guide 2 ed Pitman Publishing Web References www pajhome org uk crypt md5 Concepts in encryption http www 106 ibm com developerworks java Java Socket programming www javasoft com Official Sun Microsystems Java Site 45 Appendix Appendix1 Sample Questions Questionnaires Form Name Class Date Questionnaires Lecturers only 1 How would you grade your IT skills Software Not Good Can Do Good Very Good 2 Do you find current Project submission system taxing Very Taxing Taxing O k What do you dislike most about the current system Nothing Time consuming Problem to keep track of the project Conflict in results How comfortable are you about the new idea of online submission Not comfortable O K Would like to try Very comfortable Are you prepared to have online Submission system NO Maybe Would Like to try Yes Definitely What features would you
25. Field Format Grade Integer Comments Alphanumeric Unlimited length 52 Appendix 5 Class Diagram ClientConnection ClientSock hostname port in out Client Connection t Send Receive 4 Reset Cleanup Finalize clientConnection class to enable the client to get a socket to link to the server 53 Lect Get Student Module Term Year Amay Update Student Tables Get Student Objects LectGetStudent class to handle the connection between the Lecturer and the Server Gets the student details from the server Lect Retrieve Client Connection Save Dir Std Retrieve LectRetrieve class to handle retrieving the project files belonging to a student project from the server to the client My Protocol Start Pass Date Send Project Request Project Analyze Quit State Security Clear Response Set Security Clear MyProtocol class to handle the protocol states between the Client and Server 55 Read Config Host Port Read Config Read File Parse Key Get Host ReadConfig class to read the configuration files for server and client 56 Lect Set Grade Client Connection Student Project Set Grade LectSetGrade class to set the student grade Password Usern
26. GEMENT ii CONTENTS iii CHAPTER 1 Introduction 1 1 Introduction 1 1 2 Sort of Business 1 1 3 Testing and Certification 1 1 4 Informatics Certified Professional Programmes ICP 2 1 5 PurpleTrain com 2 1 6 Current System 3 1 6 1 Overview 3 1 7 New Proposed System 3 1 8 Life Cycle Model Used 4 1 8 1 Fact Finding Techniques 4 1 8 2 Design Technique 4 1 8 3 System Modelling 4 1 8 4 Process Modelling Data Flow Diagram 4 1 8 4 1 Class Diagram 5 1 8 5 Coding 6 1 8 6 Testing 6 1 9 Technical Environment 6 1 9 1 CHAPTER 2 2 1 2 2 2 3 2 3 1 2 3 2 2 3 3 2 4 2 4 1 2 4 2 2 5 2 5 1 2 4 2 2 6 2 7 New system requirement Analysis Introduction Fact finding techniques used Questionnaires Things to take note of when using Questionnaires Advantages of Questionnaire Disadvantages of questionnaires Description of current system Requirements Catalogue amp Data Dictionary New System Requirements Requirement Analysis Functional requirements Non Functional Requirement System Architecture Summary CHAPTER3 Design 3 1 3 1 1 241 2 3 2 3 2 1 CRUS 3 3 3 3 1 3 3 2 3 3 3 3 4 3 4 1 3 5 Introduction Server Group Client Group Input Specifications Student Input Specifications Lecturer Input Specifications File Specification Configuration File Format Configuration Files Index Files Program Validations and Processing GUI validation and Security Server Processing 16 17 19 20 21 21 21 22 22
27. Project Manager R Rajalakshmi A dissertation submitted in partial fulfillment of the requirements for the degree of Master of Science in Computer Science in the University of Wales Supervisor Professor Frank Bott University of Wales Aberystwyth 17 March 2004 ACKNOWLEDGEMENT I am indebted to my supervisor Professor Frank Bott for the invaluable support during the time I have spent working on this project Professor Frank Bott gave his time very generously in supervising my work and he made innumerable insightful comments and suggestions on each of the drafts he reviewed I owe a great intellectual debt and count it as a privilege to have worked with him Without his assistance this dissertation would not have been completed I am also indebted to my friends who had discussed commented and made suggestions on the draft I would like to thank my husband Mr Ravichandran and my son Vignesh for supporting me throughout the duration of writing this thesis Abstract This dissertation describes a system to facilitate the on line submission of student projects at the educational institution where I teach The system includes some facilities for detecting cases of possible collusion The dissertation covers the background of to the project the requirement analysis design and implementation of the system in Java A prototype is now in operation and a critical evaluation of this is included iii CONTENTS Page ACKNOWLED
28. StudentGrade 0 browseSave 0 valueChanged buildHeading getDate buildTop buildMiddle buildBottom This class creates the Graphic User Interface for the user LoginScreen MainClientWindow win ClientConnection con ClientPass passhandler JPasswordField passfield JTextField userfield JButton blogin bexit byte password String username Box ubox pbox bbox getPassword Scramble LoginScreen for the user to enter password MainClientWindow MyMenuBar mymbar ClientConnection con LoginScreen mylogin WindowClosing dispose cleanup MainClient Screen to launch the client GUI MyMenuBar JMenu fmenu JMenu hmenu ClientConnection con MainClientWindow win buildMenu showAbout showHelp MyMenuBar Class to build the GUI menubar 64 Appendix 6 Sample code clientConnection class to enable the client to get a socket to link to the server ProjectManager copyright Raji nov 2003 package projectmanager import java net import java io public class ClientConnection private Socket clientsock private String hostname 127 0 0 1 default localhost private int port 5001 default portnumber private DataInputStream in private DataOutputStream out Default constructor will read from configuration file and set the host and port
29. act is tested in the operating environment where it will eventually be used Hoffer et al 2002 Owing to the fact that the users were involved throughout the development the developer had already been testing the artefact using simulated test data Alpha testing and was confident that the system was producing the correct and desired results So the final stage is to employ Beta testing strategy where the members of Project Manger used the system in their working environment For testing I have used AMD K6 III 500Mhz pc running Windows 98 second edition Although my main testing was using Windows 98 Project Manager should also be able to run effectively under Linux or Unix In fact project Manager should be able to run pretty much the same on any machines that supports the Sun JRE 1 4 31 Test Case Test Plan l Test That the Server is able to read its configuration server cfg properly 2 Test that the client is able to read its configuration file client cfg properly 3 Test that the userid and password are sent as a different random stream of bytes for each connection 4 Test that when wrong userid and password is entered the login screen will prompt the user and exits 5 Test that when the correct userid and password is entered the student can proceed to the student screen 6 Test that when the correct lecturer id and password is entered the lecturer can procee
30. ad A new thread will handle each incoming connections This class is the ServerThread that will start to handle a Client connection MyProtocol This class defines the six stages that each single ServerThread can handle Spassword extends Password This handles the password and userid decryption and verification process IDToken The class that store a single authorization token This is make up of username and their corresponding encrypted password ServerThreadFile The class that handles the incoming student project files and details storing these in appropriate places Also responsible for creating the index file that allows the student details to be found later ServerGetProjects Class to handle request student projects it will handle finding and sending the right details and files to the client Crawler extends Thread This class generates signature files for module sources and comparing them to check for plagiarism It is a small AI engine The following diagram illustrates how the classes are related Server Class ServerGetProjects ServerThread extends Thread MyProtocol SPassword ServerThreadFile 3 1 2 Client Group Class Function MainClientWindow extends JFrame This is the main class from which all the other client GUI classes will be launched MyMenuBar extends JMenuBar The class that implements the menu bar for all our client GUI screen Cli
31. ame Password Digest Random Password Encrypt Merge Array Finalize Trace Our top level password class password and username will be protected through the use of message digest 5 It will be provided by the java security package Server Port Server Socket Server Config File Read Config Path t Server Init Listen Finalize Main server class used for listening for incoming connection Server Get Projects Year Term Module Path Input Output My Array Compare 57 t Unit Request Set Grade Send Proj File Construct Rel Path Send Student Objs Find Project Construct Stud Objs Read Student File ServerGetProjects class to handle request for incoming student projects This single server class will handle all request for student projects Its client counterparts are LectRetrieve class client class which handles the client retrievingof files from server LectSetGrade class client class which handles the client setting of grade LectGetStudent class client class which handles the getting of student details to be display on client JTable from server StudentProject StudentlId StudentName Lecturer ProjectTitle Term Module Year Grade Comments SubmittedDate setStudentid setStudentName toString
32. as Mr Frank ProjectManager Dec 18 2003 60 23456789 Viggi Mr Frank DemoMenu Dec 18 2003 7T0 1 0CAPME 345678912 Raji Mr Frank Display Menu Dec 18 2003 oo Project Summary To add and delete function Select Your Options TERM3 IT406 JAVAPROGRAMMING v 2003 v Update from server Retrieve from server Asaj Ae A a rail Mo S r gaar ReaD 11 The comments stated 1 0 means it is of 100 similar code As I have uploaded the same source code for the user Viggi and Raji it is able to detect the similarities 40 hu Dec 18 23 53 54 SGT 2003 Student Project Details StudentID StudentName Lecturer Projectrile DateSubmitted Grade Comments 123456789 Gulas Mr Frank ProjectManager Dec 18 2003 60 23456789 Viggi Mr Frank DemoMenu Dec 18 2003 701 0CAPMServera 345678912 Raji Mr Frank Display Menu Dec 18 2003 01 0CAPMServera 456789123 John Mr Frank Display Main menu Dec 18 2003 50 01CaPMServen2 Project Summary 4in Menu and to do changesTo display and editTo add and delete functionTo display and editTo add and delete functionTo display and edit Select Your Options TERM3 IT406JAVAPROGRAMMING v 2003 v Update from server Retrieve from server Set Grade for Student ssepe ne mf mo cm wr af Bel eI A ew The user John s code is 10 si
33. bmission fall a long way short of meeting any of the functionality that is offered by the new system The greatest problem with the way in which submission was previously managed was the lack of standardized and centralized approach In a manual system all lecturers worked independently and in an unstructured way The new system that has been developed solves all problems and drawbacks with the previous system and has been built in a scalable fashion for any future enhancement 5 2 Known bugs and issues not resolved in this release As we know no software is perfect and any user manual would be incomplete without warning about the current known bugs and unsolved issues I shall highlight few possible bugs and security loopholes Multiple submissions of projects when a student submits a project multiple times the lecturer screen will show multiple rows of the same student However when the lecturer retrieves only the latest file would be retrieved Overwriting other students project A malicious student could easily overwrite another students project if he or she knows the student id This is a major security loophole which needs to be solved for any real system For this release my goal was to demonstrate a working prototype with all the features I have stated 5 3 Strengths and weaknesses of the system 5 3 Strengths By using a Client Server model Project manager allows a centralized method of organizing and storing student project
34. cannot be amended is the date It is stored internally as a long type representing milliseconds since 1 Jan 1970 3 3 File Specification Project manager currently doesn t use any database It stores everything a plain text file and uses the file system hierarchy provided by the operating system to manage all the text files Each module that a student take can have a total of seven data files The following table shows these files and their respective uses File Name Uses Explanation Index dat The main index file containing the student id student name lecturer name Project Title Term Module Project file path Project filename Source directory submission date Each field is stored in a single line Summary dat Stores project summary Grade dat Stores the grade for this module as well as many comments The grade field is always stored in the first line All subsequent lines are comments 21 Grade old Backup file for our original grade file when AI engine kicks in it may modify the comments in the grade file Crawler dat Unique signature file consists of multiple lines that are extracted form the source files Ai dat Stores the number of Ai hits as a percentage tmp A temporary working file used by AI engine In all these files each unique field is stored in a single line in the order listed in the table The summary dat contains multiple lines but it stores only a single data
35. cation From the system analysis that has previously been carried out Chapter 2 the developer has indicated a list of user requirements that were the required functionality for the new system To judge whether or not the developer has attained these targets each of the requirements has been evaluated and discussed To provide a single repository to hold project submission The main purpose of this project was to solve the problem of manual storage of projects and to keep track of the students who have submitted their projects which have been achieved by the developer By adopting client server architecture students are able to submit their project as softcopy A GUI front end to enable student to submit projects The system was not only required with central repository but also to provide good user Interface This requirement was achieved by creating a central interface on the main application window that showed the login screen Its main difficulty lies in the fact that the developer comes from a technical background and has little practical experience in dealing with Java environments Although Java is one of the module in M Sc course GUI concept is totally new to the developer and substantial time has been spent on understanding the concepts Access Control facilities to prevent unauthorized access Following on the previous requirement this next item of functionality was also achieved Currently the default accounts are set as follows
36. d Professional learning road maps focus on evolving job role in complex IT environment 1 5 PurpleTrain com PurpleTrain com is Asia s first e learning service provider offering a one stop service for Business and IT education programmes corporate training courses and education related services By combining innovative technology with world class training content www purpletrain com delivers anytime anywhere learning It offers both companies and individuals a high value quality and effective online training solution Over 300 online courses are available ranging from Certificate Diploma Degree to Master programmes in business and Information technology Iinformatics has ten different centers in Singapore The main courses conducted in Woolands centre are DCS ADCS DIT and ADIT The system which I am developing is for the centre where I am working Woodlands Singapore The system mainly focuses on DIT and ADIT courses which follows project based assessment B 1 6 Current System 1 6 1 Overview For exam based programmes Informatics uses the traditional method All students assemble in a common place to write their exam and the scripts will be marked and moderated by a group of lecturers There is no problem with the exam based programmes For coursework based programmes such as DIT Diploma in Information Technology the students are assessed on projects which they submit at the end of their individual modules 14 weeks The curre
37. d to debug errors Such traces are also useful in verifying that things are working the way that I intended Some of them can be removed for production version of application Design Layout This section describes how the various classes are organised At the top most level I have organised all the classes under the same package called Project Manager package Projectmanager class hierarchy ProjectmanagerPackage Server Classes Common Client Classes Classes The figure above illustrates the top level design that consists of three sub groups namely Server class Common class and the Client class The server group mainly deals with the incoming client connections they are also responsible for carrying out the tasks that the client requests keeping track of and maintaining the storage of student projects Another example is the configuration file both the server and the client uses the same configuration files The client file contains all GUI Graphic User Interface classes the connection to the server and the instructions protocol to be sent to the server Now we will move on to the details of sub groups The following table shows the classes that are in the server group and a summary of what they do Detail of classes and methods can be referred at appendix 4 3 1 1 Server Group Class Function Server The main server class that starts the server and listen for incoming client connections ServerThread Extends Thre
38. d to the lecturer screen T7 Test that the Exit on the menu bar is working 8 Test that the help on the menu bar is working 9 Test that the about on the menu bar is working 10 Student screen Test that when essential fields are not filled in a error prompt will come up 11 Student Screen Test that when a student enters illegal characters for StudentID a error prompt will come up 12 Student Screen Test that when the student selects the term and module the right data is sent to the Server 13 Student Screen Check that when the student clicks on the browse source directory button the JFileChooser dialog for selecting directory will pop up 14 Student Screen Check that when a student clicks on the browse project documentation button The JfileChooser for selecting a single file will come up 15 Student Screen Check that when the submit button is clicked the project details source files and documentation will be sent to the Server 16 Student Screen test that after submission a dialog box will pop up saying that submission is successful 17 Student Screen Test that when the reset button is clicked all the fields will be emptied 18 Lecturer screen When the lecturer clicks on update the 32 application will fetch the project details from the server and update the JTable 19 Lecturer Screen Test to prompt a message when there is no match of the selected criteria 20 Lecturer screen
39. e reusability When we look at stdlib that we are using today we all use scanf printf etc This is use of other s work But it is not plagiarism Object Oriented language provides a greater challenge there are many prebuilt classes and libraries with much data and code abstraction indeed it is very difficult to identify which is original In education and teaching it could even be harder Normally how the students copy code The stupidest method is just to simply grab all the sources without modifications and call it their own A more intelligent approach is to get source and modify some of the parameters like the text message data and some information to suite their purpose The above two methods does not require much knowledge about programming language So if we strip away the white spaces strip away the parameters data and comments the digest of this would be the same as original The difficulty is when the copier knows the programming language and is able to modify not just parameters but also methods and classes Here comes our AI engine Now we will how it works In Java package is also related to directory and class can be related to file names For example if the class contain a method that has the same name as another method in some other class of other student In some other cases no same method but parameters are the same It indicates a strong possibility of copying The class which is used to find such similarities is
40. e saved Aligning with the analysis phase of waterfall model this requirements elicitation and analysis process is an integral part of the lifecycle and will be addressed by the developer using some of the more traditional methods in order to maintain a clear understanding of the current system and its environment Currently there is a manual system more individual ways of doing things The next part of this analysis section will put the problem in context before going onto the requirements determination process determining what people do how they do it and the volumes of works involved The existing system has then been modelled to gain a better understanding for the flows of information before the section concludes with the full set of documented user requirements 2 2 Fact finding techniques used A survey was conducted on the intended users to find out functional requirements of the Project Manager Another purpose of the survey is to find out how I can re engineer the Work process so that extra features can be produced when designing the software Questionnaires method was used as part of fact finding procedures Questionnaires were completed by a total of 50 students and Lecturers The Questionnaires were given to the appropriate individuals to fill up Specific set of questions was used in the Questionnaires Arrangement was made for the participant to complete the questionnaire 2 3 Questionnaires Questionnaires were distributed
41. echnique which I am using for analysing the current system and to find the users requirement is the questionnaire Questionnaires are very cost effective when compared to face to face interviews This is especially true for studies involving large sample sizes and large geographic areas Written questionnaires become even more cost effective as the number of research question increases 1 8 2 Design Technique Although most modern days computer systems are developed using a defined methodology this has been always not the case in fact many early computer applications were implemented without the aid of an explicit information systems development methodology Avison et al 2003 Early information system projects would be developed in the way that the programmers saw first which would often result in the requirements of the users not being fulfilled 1 8 3 System Modelling Throughout the requirements determination process a colossal amount of information has been discovered that has indicated current processes and certain future requirements in addition to what data items need to be recorded and the processes that must take place in the new system so far none of it has been recorded in appropriate manner Having completed requirements determination process the developer recognised the importance of documenting the process of the system she had just investigated In order to gain a better feel and understanding of the system the developer has cho
42. ed to the development and maintenance of academic quality relating to the conduct of courses examination processes curriculum development and many more Programmes conducted by Informatics IT programmes Informatics Computer School Diploma in Computer Studies Advanced Diploma in Computer Studies Diploma in Information Technology Advanced Diploma in Information Technology Diploma in Computer Engineering Advanced Diploma in Computer Engineering Short Courses Information Technology Training Business Programmes Thames Business School Certificate Diploma and Advanced Diploma in Business Certificate Diploma and Advanced Diploma in Administration Certificate Diploma and Advanced Diploma in Accounting IT Knowledge Programmes Desktop application courses Web amp application development courses Systems amp Network courses Database Development CompTIA courses E Business Courses Intel Course Over the past 12 years over 6 000 professionals have graduated from the Institute s Diploma and Advance Diploma programs Historically 91 of the graduates have found positions related to their studies within six months and over 70 within three months of course completion 1 4 Informatics Certified Professional Programmes ICP ICP provides the training assessment tools and credentials that help keep the student technically current personally motivated and professionally challenged Unlike other certification programmes Informatics Certifie
43. ent corner which consists of few numbers of PC s for student s use 1 9 1 New system requirement My application Project manager is based on client server model It will use java sockets for network communication The server portion will do the actual storing and maintaining of student s project files The client GUI front end is based on Swing It will allow students to submit their projects and lecturers to view grade retrieve and analyse projects By using client server model a single repository is possible 2 Analysis 2 1 Introduction The overall aim of the systems analysis section is to gain a thorough understanding of the current system the environment in which it operates in and to ascertain the future requirements of the proposed system Although Yourdon 1989 argues that a great deal of time will be wasted modelling the current system in detail Bennet et al 1999 the developers view on this stage of the project is a mixed one Whilst recognising that it is important to gain a clear understanding of the problem domain and to elicit the users requirements as precisely as possible it is also recognised that this stage is one that could be possibly be iterative as users needs and options develop over time However given the developers recent history with the company in question she feels that she already has a good insight into the current process and procedures in place and as a result a considerable amount of time will b
44. ent version doesn t do any input checks In fact it does some very essential input validation Based on input specification the studentid is limited to 12 digits This is the single important check to prevent malicious attempt that will overwrite critical system files or folders My program makes use of the OS file hierarchy system for storing of student data and details rather than using a database It is critical to prevent system path or filename to be entered here The use of Swing components like Jcombo boxes which offers a selection list which helps to prevent user from entering unwanted information JfileChooser limits the user to select either a file or directory And for the Jtable that I used in the lecturer screen the TableModel allows me to specify the type of columns Only two columns are set editable all other columns are simply for viewing only The editable column is grade and comments Grade column is designed to have an integer object and the Jtable will be able to handle the check And the comment is String so any editable characters can be entered Again Jtable and Java handles the checking This is one of the most useful features of Java language the system takes care of many minor details of programming like memory sizing and data representation However relying too much on the language itself to handle checks will definitely impact security I will highlight the possible weakness of my program in later chapter 23 3 5
45. entConnection This is the class that provides the socket connection to our server ClientPassword extends Password The client password class is responsible for encrypting the userid and password LoginScreen extends JPanel The first GUI screen that user will see It contains field for userid and password StudentScreen extends JPanel This is the class for the student GUI screen this is where the student can submit their projects SubmitServer This is the class used by the StudentScreen class for submitting the projects to the server LecturerScreen extends JPanel This id the class for lecturer GUI screen whether the lecturer can view retrieve and analyse students projects LectGetStudent This is the class will handle getting student project details from the server LectRetrieve This is the class that enables the setting of grade and comments for a particular student MyTableModel extends AbstractTableModel Thus handles the data being shown by the lecturer screen student project table Help extends JDialog The help class that displays help information Relationship of Client group MainClientWindow extends JFrame Client Connection LoginScreen StudentScreen LectScreen MyMenuBar JPanel Jpanel JPanel JMenuBar There are classes that are used both by Server and Client The following table shows the classes and their functions Class
46. er identity 5 4 The development method It would have been better to use Visual Basic than Java and instead of using text files for storage to have used database Although the back end is non transparent to the users it could have been easier to manage and control data if it were database oriented But the Visual Basic is very much new to me and the developer I am familiar with Java and was able to achieve the required specification As I have stated earlier each centre has its own server for storage Currently the system was implemented in one centre as Pilot approach If it is successful then it will be implemented in the remaining centres Meanwhile the bugs and security loopholes will be rectified before the release of second version 44 References 1 AVISON D AND FITZGERALD G 2003 Information Systems Development Methodologies Techniques and Tools 3 ed McGraw Hill 2 BENNETT S MCROBB S and FARMER R 1999 Object Oriented Systems Analysis and Design using UML McGraw Hill 3 BRUCE ECKEL Thinking in Java 2 http www mindview net Books 4 CHEFFEY D BOCIJ P GREASLEY A and HICKIE S 2003 Business Information Systems Technology Development and Management for the e business 2 ed Prentice Hall 5 DON YEATES JAMES GDLE MAURA SHIELDS DAVID HELMY System Analysis and Design Prentice Hall 1994 6 GRIFFITHS G 1998 The essence of structured Systems Analysis Techniques Prentice Hall 7 HOFF
47. erver is started System out printIn ServerSocket created serversock n Copyright Raji 2002 System out printIn Server started at new Date lloop continously waiting for client connections while true Socket incoming serversock accept System out printIn Connection from incoming spawn a new thread to handle the client connection new ServerThread incoming PATH catch IOException e System err printIn Server IOException e System exit 1 j j A finalize method for the class protected void finalize throws Throwable serversock close Main Method To launch our Server daemon public static void main String args Server myserver new Server 75 Appendix 7 Test Cases Server connection A gt cd src Msrc javac d c rojectmanager V f Note projectmanager rlhreadFile java t or overric a deprecated API lote Recompile with deprecation for details fl Nsrc cd class projectmanager Server verSocket addr 0 0 0 0 0 port 0 localport 5001 1 Astan Ae a a Desin iava Raj K msD05 Pro 76 Login Screen Login Screen For Lecturer and Student File Hel Auto E p g Welcome to Project Manager Projects Submission Login Username Password Login Exit Asaj A e c es wo Sm err cun g Si Ble Te gaa 1219 TI Student Submissi
48. ess they copy project manager sources exactly After crawler crawls through all the source directories generating crawler dat for each set of students sources it will then start comparing crawler dat files that belongs to the same module In this case it will compare Project Manager signature file with other signature files from other projects in Java Programming module In this way it detects hits similar lines Suppose we have a crawler dat A and second crawler file B The first line of A is read and it is compared to all the lines in B Once it finds a match a counter is incremented and the second line of A is read This process is repeated until all the line in A has been compared The counter would hold the number of hits This value divide by the total number of lines in A will yield the percentage of A s signature that is similar with B s The percentage result is stored in ai dat and also uploaded into grade dat Furthermore the directory string of B will 28 be stored into the comments of grade dat This allows the lecturer to know both the percentage of similarity as well as with whom it is similar How well does this heuristic work Frankly I don t really know It takes lot of testing with the large sample of diverse sources before knowing the result I find it works moderately well For blatant and outright copying this method should be able to pick them out easily 29 4 Coding and Testing 4 1 Coding As I have stated
49. est 1 Revise Questionnaire If necessary 0 5 Data Entry and verification 1 5 Coding open ended response 1 Analyzing data 1 Preparing the report 1 Printing and distribution of the report 1 5 Total Hours 12 Hours 2 3 2 Advantages of Questionnaire Questionnaires are cost effective compared to face to face interviews They are easy to analyse Data entry and tabulation can be easily done by computer software packages It reduces bias There is uniform question presentation and no middleman bias The researcher s own opinions will not influence the way respondents answer questions 2 3 3 Disadvantages of questionnaires The main disadvantage with a written questionnaire is the possibility of low response rate Sometimes it is simply not suitable for some people The sample questions distributed to the students and lecturers can be seen at Appendix 1 2 4 Description of current system In Informatics student projects are submitted manually as a bound document with accompanying floppy disks and a CDROM holding the source files The following problems are identified from the analysis phase A serious problem is in maintaining and handling the mass of student projects For a class of 35 to 40 students a lecturer will end up receiving a stack of project documentation There is difficulty in handling and keep track of projects While space is one problem of the current system it is also difficult to keep track of who submitted what and
50. f ee eS G OE mW Eo polo eef amp 203 1 1 0 fk Eo poll ee 8 amp 203 1 1 0 f ec19 2003 1 0 0 0 LES 36 Student s project submission Enter Student Details Student Name John Student ID 456789123 Lecturer Name Mr F rank Project Submitted x go Project has been submitted TERMS 4 Click Ok to exit Project Summary Project Title Disp To display and edit Select your Source Files and Project Documentation D iRajiJavaFile1 cAM sc ProjectiConclusion doc Browse Source Directory Browse File Submit Reset 5 amp Pail eo Som r ioo Ma Han Sr at R8 b 11 51PM Lecturer View project Studen D StudentName Lecturer ProjecTile DateSubmited Grade Comments ccena 23456789 Viggi MrFrank DemoMenu Dec 18 2003 FO 4 gt 38 Once Analyse button is pressed Me JAVA BEE e A ese Ex efe Al Second module is C PMServer 3456 78912 17T406 JAVA PROGRAMMING Comparing C PMServer 123456 789 17T406 JAVA PROGRAMMING crawler dat C PHServer 3456 78912 1T406 JAVA PROGRAMMING crawler dat Current in is C PMServer 23456 789 1IT4 6 JAVA PROGRAMMING crawler dat crawlFile size is 3 First module is C MPMServer 23456 789 1IT406 JAVA PROGRAMMING Second module is C PMServer 123456 789 1T406 JAVA PROGRAMMING Comparing
51. fe Cycle Model approach Owing to previous development experience whilst working for small project I am very much accustomed to the approach of integrated testing throughout the software development process In addition to my experience the principle of the adapted methodology states that testing should be integrated throughout the development life cycle Bearing this point in mind the majority of the testing has been already carried out in the iterative design and build phase of the project When writing each class and method the developer tested to see that the correct results were being obtained For example the class used to detect plagiarism and write the comment into grade dat was tested to ensure that the similarities are detected and it is saved into grade dat Having stated that the majority of testing has already been accomplished by integrating it throughout the life cycle there is still some final testing to be carried out By looking at the V Model for systems development figure source Adapted from Life Cycle Models Allan 2003b it can be seen that having adopted the integrated testing approach the developer has 30 already considered the majority of testing that takes place within the system with the exception of User Acceptance Testing IEEE User Us eun ING CSO SNCS Requirement System Design System Testing E Program Design Testing Code The final stage of user acceptance testing is where the final artef
52. field project summary 3 3 1 Configuration File Format Besides these seven data files used to store information Project Manager utilizes two configuration files and a password file The client portion GUI front end of Project Manager uses client cfg as the default configuration file The Server portion of Project Manager uses Server cfg as its default configuration file and it uses serverpass cfg as the password file where all the userids and passwords are stored The format of these files is simple In client cfg there are two lines host 127 0 0 1 and port 5001 In server cfg there are port 5001 and path C PMServer The path specifies the server data directory where all the student data are stored 3 3 2 Configuration Files FileNme Uses Explanation Client cfg Contains the client GUI front end configuration in name value pairs Host 127 0 0 1 Port 5001 Server cfg Contains the server configuration Example PATH G PMServer Port 5001 Serverpass cfg Contains the username and their corresponding passwords The password is encrypted and this entire file is written using DataOutputStream treating everything as a binary byte MypassWordCreator class program is a utility that can be used to create such files 22 3 3 3 Index Files Addition to this Project Manager also uses an index files to help it find and track the student projects that are submitted These index files are named index da
53. h Activities are represented in a page from top to the bottom and from left to right There must be a start point and an end point Activities are commonly ordered in a determinable sequence 1 8 5 Coding The design will be converted into workable solution by using Java programming Java byte codes require a virtual machine to interpret them and execute the instructions natively For this new system I will be using Sun s JDK 1 4 1 and the GUI design will be used based on Swing components I have chosen to implement an intelligence to detect plagiarism The book Constructing Intelligent agents with Java provides a good introduction to some AI artificial Intelligence concept and implementation My initial plan is to create a rule based reasoning system to analyse ASCII source files According to this AI rule set will be configured to recognise java language and be able to pick out plagiarism based on rules and this component should also be expandable to accommodate other languages like C JavaScript etc This proves to be too daunting task to be accomplished within the time frame that I have So instead of using rule based method I have implemented a signature based method Regular expressions are used to match patterns As of Jdk1 4 1 Java supports regular expression When creating application in Java I have decided to use Swing components This is to create consistent look and feel but also to take advantage of functiona
54. hecks complete successfully private void listen int port Create the ServerSocket try serversock new ServerSocket port print out the success status and time the server is started System out printIn ServerSocket created serversock n Copyright Raji 2002 System out printIn Server started at new Date lloop continously waiting for client connections while true Socket incoming serversock accept System out printIn Connection from incoming spawn a new thread to handle the client connection new ServerThread incoming PATH catch IOException e System err printIn Server IOException e 71 System exit 1 A finalize method for the class protected void finalize throws Throwable serversock close Main Method To launch our Server daemon public static void main String args Server myserver new Server To create Table Menu our main server class used for listening for incoming connection ProjectManager Copyright Raji 2003 ui package projectmanager import java io import java net import java util Date public class Server private int port 5001 Default port will be set at 5001 private ServerSocket serversock 72 private String serverconfigfile server cfg private ReadConfig readconfig class to read the server configuration private String PATH C PMServer default data directo
55. hen it would create a module folder under this year folder based on the module for which the student is submitting Within the module folder a Term folder would be created based on the Term the student has selected Within this Term folder there would be an index file called index dat This will holds the information such as studentid module Term and year This allows the server to keep track of the time and date on which the student submits the project The actual project details are stored in the module folder of the particular student folder The index dat file in this module folder contains the various fields which the student has entered during project submission I understand it sounds a bit confusing Please do not confuse between the student index file and server index file The student index file simply stores students project details for the module the student has submitted project The server for finding and locating student projects uses the server index file The server would also create grade file that stores the grade and comments that the lecturer has sent It will be in the same folder as the student s index file An example would be BaseServerDataFolder StudentId ModuleName index dat and BaseServerDataFolder StudentId ModuleName grade dat I hope this sums up how the OS file system hierarchy is used 24 3 6 Password Encryption Scheme The userid and password encryption scheme that I used can
56. idea is the same The following code taken from ClientPass shows the encryption process result Encrypt bpass temp merge buser result result Encrypt temp temp merge result getRandbyte result Encrypt temp result is a byte array that will be the final digest sent across the network buser is a byte array contains username or userid bpass is the byte array contains the password GetRandbyte will retrieve an array of 64 bytes of random data Merge is a join method for joining two byte arrays together to give a single byte array The password is encrypted first and joined to the username and they are encrypted and this is joined to the random bytes and encrypted to give the final digest This far more secured than the yahoo com method as the username just a stream of bytes that is different each time Crawler and AI engine Plagiarism what does it mean exactly Here is the definition The act of taking the writings of another person and passing them of as one s own The fraudulence is closely related to forgery and piracy practices generally in violation of copyright laws The above definition applies to writings and violations of copyright what about software sources are these considered writings They are definitely a form of expression and protected by copyright laws The software sources can also be plagiarized 26 In software there is a saying why reinvent the wheel the actual meaning of this is cod
57. ing serverconfigfile server cfg private ReadConfig readconfig class to read the server configuration private String PATH C PMServer default data directory for server Default constructor will use the default port number public Server read the server config file and get our port and data path settings readconfig new ReadConfig serverconfigfile try port Integer parseInt readconfig parseKey PORT catch NumberFormatException e System err printIn Wrong server config format at port server cfg System err printIn Unable to get port number System exit 1 PATH readconfig parseKey DATPATH 69 if PATH null System err printIn Wrong server config format at DATPATH server cfg System err printIn Unable to get DATA PATH System exit 1 start the server initialization process serverInit listen port start listening for incoming connections public void serverInit File myfile new File PATH check if PATH exists if myfile exists if directory doesn t exists create it if myfile mkdirs hf creation failed System err println Unable to create data directory PATH n Terminating System exit 1 now PATH exists check if PATH is a directory if myfile isDirectory System err printIn Error DAT PATH is a file PATH n 70 Terminating System exit 1 c
58. ion of taught course project online According to the management as the Purpletrain operates worldwide and currently the server is loaded heavily And the management of Purpletrain is not ready to support Project Manger The second option was to make use of the service of plagiserve com Plagiserve com works as follows The student needs to register and become a member of plagiserve com It is mandatory that the student needs to check for plagiarism by using Plagiserve com and submit the plagiarism report together with their final document Based on the percentage hit rate the student can be assessed Here the responsibility goes to individual student The problem with this system is this service can detect the plagiarism for the information taken from Internet only This system is more suitable for research based projects The requirements for the new system are client and server All centres are equipped with a servers and clients The objective of the project is to create a prototype using Java This prototype includes an interface for student to submit their project and an interface for lecturers to view and grade students projects Simple plagiarism identification is also included in the server portion The system Project Manager is initiated due to increase in costs and the limitations of the available system In order to reduce the cost management consider the option of replacing the project manager with the current manual system Based o
59. like to have in the new system Central Repository Check for plagiarism Both Nothing Please put you thoughts on having online Project submission system 46 Questionnaire Students l How do you grade your IT skill Not Good Can do Good Very Good 2 Will you feel comfortable to have online project submission system Not Comfortable O K Would like to try Yes Definitely What features would you like to have in the new system Plagiarism check Central repository Both Nothing 47 Appendix 2 Design Tools considered 2 1 Logic flow chart Flow charts are no longer considered as modern technology Flow charts focus mostly on decisions a special type of process that now appears in DFD and object diagrams A summary of flow charting technique is as follows Functions or processes are represented by rectangles 2 Decisions are represented by diamonds 3 Inputs are represented by parallelograms 4 Outputs are represented by a hardcopy symbol a rectangle symbol with a wavy bottom edge 2 2 Nassi Sceneiderman Diagram It is a modern alternative to flow charts 1 Can be drawn using text and line 2 Shows process by series by selection or iteration 3 More structured than flow charting 2 3 E R Diagram It is used to model the entities that a computer system records information about and the relationships between those
60. lity more advanced than that provided by native platform equivalents such as AWT Abstract Windows Toolkit The basic difference between Swing and AWT is that Swing is implemented with no native code and therefore known as a lightweight component in contrast to heavyweight AWT native platform component 1 8 6 Testing Testing any artefact of systems development whether it is hardware or software is always an important activity however it is often squeezed to the end of a project As I am aware of the importance of testing the artefact from the very start of the project I have decided to use the approach of integrated testing throughout the software development process 1 9 Technical Environment Currently all Informatics centres are equipped with individual servet server used in the centre is a File server A File server network is made up of Pc s as as a Server computer The server is usually responsible for the applications and the information storage whereas the Pc s carry out most of the processing The server uses Windows 2000 operating system and all users Pc s are running with Windows 98 operating system All stand alone Pcs are loaded with compilers such as Java Ski 1 4 1 C programming and Visual Basic 6 0 This server is connected with all the labs in the particular centre All labs have standalone PCs that are connected to the server All lecturers are equipped with Desktop Pc for their individual use Each centre has a stud
61. milar to Viggi as the developer discussed in the earlier section up to 20 of similarities are acceptable because of code reusability The result from the Beta Test scenario were extremely positive appendix 7 although there were some recommendations and system imperfections reported Every member of the Project Manager was able to log into the system and able to upload their project A negative aspect that came back from the beta testing was that as the number of student increases it was taking longer time to do the search For one student approximately it takes 30 seconds to do a search For a class of 40 students it may take more than an hour But it is worth spending one hour to detect the similarity of coding Although the volumes of projects this was something I have considered when designing the system it was not anticipated that the search would take so long to display results and it is an unfortunate drawback Still it is much better than the manual search 41 5 Evaluation and conclusions 5 1 System Evaluation This chapter of the report looks into the overall success of the project Manager that has been developed for the submission of projects To prove the overall success of the final system the developer has utilized two different evaluation methods which were e to evaluate the system against the user requirements and e to evaluate the system against the system previously used 5 1 1 Evaluation against Requirements Specifi
62. n must be viewable for Lecturers The remainder of this chapter discusses the main considerations made during the design phase of this project Design is best described as implementing independent models to represent information flows how users interact with the system and how certain mechanism will operate in a new system 2 6 System Architecture The system architecture used in this project is Client Server based model This project uses communication mechanism linking some sub processes The sub processes in this system are User Interface Processing Management Storage Management The client handles the Interface layer and the Server handles both processing and storage management Informatics File Server Student Workstation Lecturer Workstation 2 7 Summary This chapter has demonstrated to the readers the way in which the developer has gone about eliciting the requirements from current manual system By investigating the current practices of the project manager has been able to learn in more detail what data and processes are in the current system and what information needs to be stored in the new system The list of functional and non functional requirements will now provide the input to the Design chapter which will look into how these requirements will be implemented into the new system 3 Design 3 1 Introduction Project Manager is built using Java an Object Oriented language I
63. n the findings above it can be concluded that the school needs a better online submission for projects The students and the lecturers support this system unanimously 2 5 Requirement Analysis This section discusses tasks carried out during the analysis phase of the project Analysis defined by Hoffer et al as fundamentally an intelligent activity in which analysts capture and structure information This information captured relates to the project domain and its origins objective of the process and current system utilised When performing analysis information should be obtained from a wide range of sources to maximise the analysts understanding This concept was utilised when determining the requirements for the project Questionnaires were used to obtain information from various sources The information gathered identified that there were two different categories of user who have dissimilar needs for the system and data Student Users Lecturer Users Once this information had been gathered the next step was to structure it in a manner that is unambiguous concise and accessible to others including non technical personnel Yeates et al 1994 ljirocturea techniques are typically produced to model existing processes however these can be extended to encompass models of the required system Within this project various techniques were used to document information following Data Flow Diagram DFDs Sequence Diagram Process Tools
64. nt procedure is as follows Individual lecturers collect the projects for their own modules and mark the project and check the program manually If the class size is more than 35 two lecturers will teach the same module Then the projects will be sent out to HQ headquarters for moderation For a class of 40 students each lecturer will receive a stack of documents It is very difficult for lecturers to keep track of all the projects Each project softcopy needs to be checked for its functionality Each lecturer teaches a minimum of two to three DIT classes and end up with large number of documents to store The major problem with the current system is there is no central repository and it is very difficult to identify plagiarism in coding 1 7 New Proposed System The new system will help to eliminate the problems and limitations caused by the manual system The objectives of the new system are to reduce the number of complaints from students by providing value added services with the help of the system and increasing the staff productivity by computerising the manual processes The system must also be user friendly All these will help the centre save enormous amounts of time money and resources as well as increase staff job satisfaction With the above objectives in mind we propose the following requirements for the new system e to provide a single repository to hold project submissions e a GUI front end to enable student to submit thei
65. on Screen on successful entry of student and password 78 File selection Screen Q E Raji File Help Student Submission Window M submit your projects here Fri Nov 14 11 46 51 SGT 2003 Lookin C gt cea le c B8 8 Auto Cist Cf PokeDavid Cf Screensavers Pokemon Sega Program Files Ci serverpackage C projectmanager 4 Sierra C Raji Ci Slot ravi Snes Recursion C sre File Name Cisre Files of Type All Files 0 by qi Open Cancel Ihread 1 1 port oUpasss Browse Source Directory Browse File Submit Reset TESA Mstat A e pO Desio seva cnai iava S ioi ke Bie 11 504m Project Acknowledgement Screen File Help Student Submission Window M submit your projects here Fri Nov 14 11 46 51 SGT 2003 Enter Student Details Student Name Vignesh Student ID 123456789101 Lecturer Name Raji Project Submitted x Projecthas been submitted TERM1 L Glick Okto exit Project Title Proje Project Summary This to provide central repository and detect possible plagiarism in the java code EE Lh m Select your Source Files and Project Documentation CAsre CAMy DocumentsiTeacher doc Browse Source Directory Browse File Submit Reset tart A 2 2
66. one PC I can simply use the local loop back and run both the server and client locally They still communicate through sockets like what they will do across an actual network It uses socket locally as well as within a network for graphical display 25 Yahoo com influenced my userid and password mechanism Normally when log into Yahoo account Yahoo uses a JavaScript MD5 implementation to encrypt password before sending it through the network No plain text transmission is allowed I came to know about this mechanism when I was teaching the module html and JavaScript WL1 Yahoo did not create the JavaScript MD5 implementation rather it was written by a British youth who made his script available WL2 The yahoo server will generate a random number and embed it within the password form at its login page when a user requests for a page via a browser After the user keyed in his id and password and hit the submit button several things happen Firstly there will be a browser compatibility check If this passes then the JavaScript MDS is invoked It will take the password and message digest to generate 16 bytes digest This digest joined to the random number and generate new digest This is the first level of security no hackers will be able to infer the password from the digest unless they have limitless computing power at their disposal to try a brute force cracking I did it slightly different way from the Yahoo model But basically the
67. pore Today Informatics has grown into a worldwide network with global operations in over 400 training and education centres spanning across 33 countries Informatics aims to continuously provide its students with the best educational programs through academic partnerships with world renowned Universities and global technology holders Informatics had trained over 450 000 students worldwide In terms of turnover Informatics is now comparable to the top 20 Nasdaq listed training and education companies Today due to its strong focus on delivering customer required products and services Informatics has become a multi national corporation with the worldwide reputation for providing high standards of training and educational services to delight all its partners and customers 1 2 Sort of Business Informatics core business activities are IT training and education business training education and IT related services and franchise operations These are delivered through its five franchise products namely Informatics Computer School Thames Business school Computer Assisted Learning CAL IT centre Regional Applied Computing RACC and also Cambridge Child Development Centre CCDC Informatics recently launched online learning and educational program and cyber campuses to complement course deliveries to students to reach out to the world market through the Internet by the name of Purpletrain com 1 3 Testing and Certification Informatics is dedicat
68. r projects e a GUI front end to enable lecturers to view grade retrieve and analyse projects e adequate access control facilities to protect against unauthorised access e amini Al engine that allows the system to warn the lecturers of possible plagiarism The new system will overcome the problems identified in our current system as follows By providing a central repository all students will be allowed submit their program and document online This will eliminate loss of documents and make it easy to keep track of their submission to check the program to transport projects electronically to HQ Students can upload their project electronically and this will reduce the time taken to keep track of the project by the admin staff Lecturers can view the project electronically and grade it and analyse the project code for plagiarism All students will be given an id and password to login to the Project Manager to prevent unauthorised access By using the new system it avoids physical storage of large number of projects and able to identify the plagiarism in coding 1 8 Life Cycle Model Used It is important to understand how the system will be useful for the users and how the current system is functioning To do the detailed analysis and design and develop the new system I am using the Waterfall Model to develop the system The waterfall consists of analysis design code test phases 1 8 1 Fact Finding Techniques The fact finding t
69. ry for server Default constructor will use the default port number public Server read the server config file and get our port and data path settings readconfig new ReadConfig serverconfigfile try port Integer parseInt readconfig parseKey PORT catch NumberFormatException e System err printIn Wrong server config format at port server cfg System err printIn Unable to get port number System exit 1 PATH readconfig parseKey DATPATH if PATH null System err printIn Wrong server config format at DATPATH server cfg System err printIn Unable to get DATA PATH System exit 1 start the server initialization process serverInit listen port start listening for incoming connections 73 public void serverInit File myfile new File PATH check if PATH exists if myfile exists if directory doesn t exists create it if myfile mkdirs hf creation failed System err printIn Unable to create data directory PATH n Terminating D System exit 1 now PATH exists check if PATH is a directory if myfile isDirectory f System err printIn Error DAT PATH is a file PATH n Terminating DUE System exit 1 checks complete successfully private void listen int port Create the ServerSocket try 74 serversock new ServerSocket port print out the success status and time the s
70. s Another advantage of the system is password encryption scheme Rather than hard coding userids and password into the program code a separate password file is used And the passwords in this file were encrypted The use of configuration file for both client and server is another strength of project manager Finally Project Manger is designed as modular base For instance the student screen functions could be changed without affecting the lecturer screen Such modular design allows parts to be changed easily and new features to be added It is also easy to debug and maintain 5 3 2 Weaknesses As highlighted earlier the bugs identified in the previous section can definitely be considered as weakness of Project Manager The other aspects of Project Manager is when I strive to build a component based and an Object Oriented design that can enable code reusability the developer admits that some parts of the coding were really quick hacks to get the application going 43 Furthermore the communication protocol between the server and the client was delicate and it was not perfect in some places Better planning and clean separation of communication protocol from the components would provide a better design Project Manager utilizes the Operating System hierarchy to organize and store student s projects instead of using a database The weakness is that there is no concurrency protection in this release Also there were insufficient checks for us
71. s is we can t reverse the md5 process on a given digest and get the input MDS is one way hashing code This enables it to encrypt a given text or password and generate unique digest that can t be reversed back to the original text or password So only the original user knows what password it is MD5 is widely used in the open source community as a checksum for the source files and binary packages that are distributed Java 1 4 has a security package Java Security which contains a message digest class that implements MDS I am using this message digest class request a provider for MD5 and then uses the requested MD5 object to do encryption For userid and password storage they are stored as binary bytes using a DataOutputStream The format is userzencryptedpassword One such entry per line I have written a Java utility MyPasswordCreator which can create such a password file The password portion will be of gibberish of characters The plain text password is first encrypted with MD5 to generate a first digest This first digest 16 bytes is then appended to username and MD5 encrypts the resulting bytes again This final output is stored as password portion 3 6 2 Password and userid transmission This section deals with the transmission of userid and password through the network Project manager is a client Server model and the information need to travel through a network which is inherent For demonstration I am going to use a stand al
72. sen to coherently represent the information gathered as part of the requirements determination using a variety of modelling tools including process modelling requirements catalogue data dictionary and class diagrams When it comes to recording the result of analysis it was very difficult to decide which design tool to use I compared the tools such as Flow charts E R diagrams Data Flow Diagram Object Oriented Diagrams And I have concluded that DFD is more suitable for the current system Analysis and Class diagram is more suitable for my proposed system Design as I am using Java as my developing tool Appendix 2 The design technique which I am using for both current and new system is levelled DFDs data flow diagrams Bp is a process oriented It can be used to describe both existing and planned system Leve FD shows how the system is made up from processes data stores and data flows The level 2 DFD describes how the individual processes are made up from sub processes data stores and data flows 1 8 4 Process Modelling Data Flow Diagram Hoffer 2 describes process modelling as graphically representing the functions or processes which capture manipulate store and distribute data between a system and its environment The most standard and almost common way of carrying out this process has been to develop Data Flow Diagram for the current system Data Flow Diagrams DFD are crucial elements in the system analysis process as many o
73. strive to build Project Manager in an object oriented and modular way so that each component can be updated and changed independently of others My approach is slightly different from the normal system development life cycle First I analyse the problems and come up with the solution Project Manager with the set of features that I want it to have Then I started building the application component by component Then I review my overall design and plan along the way I started small module build up a component that works then go on to the next and so on At each stage I will plan how the components will tie in together and work as a whole Some rewriting of code may be necessary but my design will be modular and component based Building component by component make a difficult task easier to understand and implement Since each component is tested along the way the final test will not throw up too many bugs as most would have been eliminated earlier Once I have the entire application working then I look at its overall design and do some cleanup and optimisation recoding components and modules if necessary Reviewing the design and recoding will lead to more efficient and elegant design application As Project Manager is client server based a lot of trace information is needed For each component and class that I build I have sprinkled System out printIn to print out variables etc This allows me to trace the progress of the program an
74. t They exist in folders named years like 2003 Within year folders there are further folders based on module names like IT 406 JAV APROGRAMMING and within these module folders are the term folders like TERMI TERM2 Index files are located within term folders Each index will simply contain lines of studentids The OS file system hierarchy is fully utilized by Project Manager to enable it to track who has submitted in which year and term 3 4 Program Validations and Processing This section deals with some of the validation of user input done by the GUI front end as well as how the password mechanism work and how the AI engine generates the signature files and determines hits 3 4 GUI validation and Security As you see the input and file specifications most of our user data has little or no restrictions placed on them This is possible because Swing components are being used For this initial release my main is goal is to build a relatively secured program that can perform all the features that I set earlier Java itself is a secured language the JVM checks for array out of bounds and doesn t allow buffer overflow or underflow The result of this would be a run time exception which will halt the program before any damage occurs I am placing some faith on this mechanism to stop malicious input from users for this 0 1 release Subsequent releases could shift the weight of verifying to my own application code This is not to say that my curr
75. ther techniques depend on them Griffiths 1998 DFDs are helpful in the analysis process as they are not only amalgamate and bring structure to the mass of information that has been discovered Griffiths 1998 but there lack of ambiguity and ease of understanding makes them a powerful communication tool Weaver et al 1998 between the system analysts and stakeholders The deliverables from this process modelling is a context level DFD The main purpose of this first DFD is to show and fix the boundary of the system showing its interaction with external entities Weaver et al 1998 and it can be seen in Fig 2 1 1 8 4 1 Class Diagram A class diagram describes the classes that make up a system and the static relationships between them Classes are defined in terms of their name attributes or data and behaviours or methods The static relationships are association aggregation and inheritance The notation used in class diagram are as follows ClientPass Password Inheritance byte result byte buser byte bpass Class byte temp Class Name Attributes Setcon Scramble Cleanup Methods Flowcharts are the classical diagrammatic tool for designing either system or program logic They use symbols and interconnecting lines to show a system s overall work flow showing what is being carried out logic and sequence of specific program operations Flowcharting is however more of a sequential approac
76. will be written to ai dat and grade dat Server Thread File MyPlan Check Mod Path Src Get Project Details write Main Server Index Get source File Create Src Dir Write Project Index File Get Project Document Initial t Write Project our individual thread server classes that will be handling each incoming client connections Each incoming client connection will be assigned a single thread that will handle it 61 AbstractTableModel MyTableModel MyTableModel boolean DEBUG false final String columnNames getColumnCount getColumnName isCellEditable printDebugData TableModel class to format all the student details that appear in the JTAble This class is based upon the sample provided by the Sun Java Tutorial I have built upon and expanded on it so that it can handle my student objects for ProjectManager Help MyMenuBar EN 7 MainClientWindow 62 LecturerScreen LectScreen MainClientWindow win ClientConnection con ClientPass passhandler GridBagConstraints constraints GridBagLayout gb JTable mytable JTextArea mytextarea JComboBox cterm cmodule cyear JButton bupdate bretrieve banalyse bsetgrade LectAct myact myTableListener tableact StudentProject mystd File savedir int mySelectrow 1 String year String term String module set

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