1 Object-Oriented Software Development Project Aaron Christopher.

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Object-Oriented Software Development Project

Aaron Christopher

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Project Overview

• Kind of like SourceForge• Allow developers to catalog their software,

source code and documentation for use by other developers

• Also provide mechanism for publishing a virtual appliances that run the software on its intended platform.

• Users of the system can connect to the appliances and use the software live in their browser through a client application implemented as an applet.

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Project Breakdown

• The complete system is broken into three subsystems– The Desktop Sharing System– The Server (the scope for today)– The Client

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Some Java Technologies Used by the Server

• Multiple Threads and Synchronization• Blocking TCP/IP Sockets from the java.net

package• Object Streams and Serialization• Embedded Apache Derby Database

– A small footprint open source SQL database– Can be run in embedded mode in java

applications and accessed using JDBC– All database code runs in your process

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Actors Overview

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Top Level Use Case

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Deployment Diagram

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Add New Modules

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End Session

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Facilitate Use Of Live Modules

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File Transfers

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Join Collaborative Session

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List Active Sessions

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Client Log In

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Manage Collaborative Sessions

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Manage Software Modules

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Manage Single User Sessions

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New Collaborative Session

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New Private Collaborative Session

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Client Authentication

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Client Authentication

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Database Interaction

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Direct Session Message

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Client File Download

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Module File Download

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File Transfers

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Join Collaborative Session

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Leave Session

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Module List Request

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Server Overview

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Session Control

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Session List Request

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Start Collaborative Session

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Text Messaging

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Client File Upload

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Message Polymorphism

Client To Server Messages Server To Client Messages

Message Interfaces

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Inheritance Among Session Types

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Singleton Design Pattern

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MVC Pattern

• Model• View• Controller

A simple diagram depicting the relationship between the Model, View, and Controller.

Note: the solid lines indicate a direct association, and the dashed lines indicate an indirect association (e.g., observer pattern).

Source: http://en.wikipedia.org/wiki/Model-view-controller

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Ostermiller Utilities

• http://ostermiller.org/utils/• Circular Byte Buffer for inter-thread

communication (can be bounded or infinite). Beats Java’s Piped IO Streams by far!

• More Intuitive String Tokenizer– Java (java.util.StringTokenizer)

• A,B,,D tokenizes to “A”,”B”,”D” (3 tokens ignoring the missing string)

– Ostermiller (com.Ostermiller.util.StringTokenizer)• A,B,,D tokenizes to “A”,”B”,””,”D” (4 tokens including an

empty string)