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Project P1:  Internet Chat System:

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Software Engineering Requirement:				
	Functional Requirements				
	Non Functional Requirements
		Language
		Reliability
		Efficiency	
	Security
	Priority

Algorithm Design
	Classes
	UML diagram
		
Testing
	JUnit test
	Bugs

Comparison With a UDP implementation.
		
Appendix A: source code.
Appendix B: Installation and usage Guide	

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Software Engineering Requirement:				

An internet chat system has two basic components. A server and a 
client.We will analyze the requirement as is applicable to the 
system as a whole as well as for each component. We are provided 
with the TCP protocol to connect our system.

Functional Requirements
				
1.Server:
a.A server should run on a specified port.
b.It should listen for and accept connections from clients over a 
TCP connection.
c.It should maintain a list or collection of such clients.
d.It should receive data from the client and pass it to all the 
other clients.
2.Client
a.A client should try to connect to the server when given an ip 
address and a port number.
b.It should receive messages from the server and display it.
c.It should read data from the keyboard and send it to the server.
d.It should not mix up the users own typing and the message received
 from the server.
	
Non Functional Requirements
1.Language and library
The Java 1.5 API will be used.
Only standard Library will be used. 
2.Efficiency
a.Server
The Server must be able to handle simultaneously a large number of
clients. A 300 clients maximum limit would be appropriate.It must be 
able to run on a modest hardware.
eg. 
processor 1.6 ghz
memory 1gb ram
network bandwidth 100Mbps
b.Client
Any java virtual machine capable of running a TCP protocol as well 
as a bare minimum GUI.
eg. smartphones, laptops, thin clients,
3.Reliability
a. Server
The server must be able to manage its system resource.It must create a 
lot of connections and close them without running out of resources.
The connections may break, and the server must recover and reuse the 
resource. The server must not block on any of the connections.
b.client
A problem with a single client must not affect the other user.
4.Security
The system opens a serversocket and large number of sockets on a 
network. Therefore it is imperative that the sockets are protected 
from outside malicious users.
It may implement an authentication and/or data encryption.

5.Priority
Must:
1.Open a Server Socket on the server.
2.Add clients into a list on the server.
3.Open a socket on the client and on the server
4.Send a message to the Server from the client.
5.Receive a message from the Client to the server and display it on 
the screen.
6.Send copy of a message to all the Clients on the user.
7.Drop a client whose socket has been blocked.
Should:
8.Client should not mix up the data from the server and users own 
keyboard echo.
9.Server should only allow legitimate chat clients to establish 
connections.
10.Server should manage the nick names and prevent duplicates.

May:
11.Server and client should encrypt the data.
12.The chat client may use a GUI. 
13.the chat client may implement a filter so that only selected users
message are displayed.

Comparison With a UDP implementation.