cs101.net
Class Server

java.lang.Object
  cs101.net.Server

All Implemented Interfaces:

java.lang.Runnable

public class Server

extends java.lang.Object

implements java.lang.Runnable

Generic Server class: broadcasts whatever messages it receives to all clients other than the message's originator. Spawns one thread to listen and multiple others to handle the clients as they connect.

Takes a single optional argument to specify the port. Otherwise spawns a UI dialog to get connection information from the user.

Some hints taken from ORA Servers.

Copyright 1996 Massachusetts Institute of Technology

Version:

$Id: Server.java,v 1.1.1.1 2002/06/05 21:56:32 root Exp $

Author:

Todd C. Parnell, tparnell@ai.mit.edu, Maciej Stachowiak, maciej@ai.mit.edu, Emil Sit, sit@mit.edu, Joshua Reuben Brown, reuben@ai.mit.edu, Lynn Andrea Stein, las@ai.mit.edu

See Also:

RunServer, Client, ServerDialog

Field Summary

protected java.util.Vector	babySitters list of BabySitters to handle each client connection
protected java.net.ServerSocket	sock the server socket, i.e., the listener
protected java.lang.Thread	spirit animating Thread

Constructor Summary

Server()
Creates a server socket.

Server(int port)
Creates a server socket.

Method Summary

protected void	listenOn(int port) Helper method to actually open the ServerSocket and intialize other state.
protected void	removeBabySitter(BabySitter bbst) Removes a BabySitter for the list of babySitters.
void	run() Wait loop to service the ServerSocket.
protected void	sendToAllExcept(java.lang.String s, BabySitter bbst) Sends the string passed in to all clients accept the one represented by the BabySitter passed in.
protected void	spawnBabySitter(java.net.Socket s) Creates a BabySitter with the client socket passed and adds it to the list of BabySitters.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

sock

protected java.net.ServerSocket sock

the server socket, i.e., the listener

babySitters

protected java.util.Vector babySitters

list of BabySitters to handle each client connection

spirit

protected java.lang.Thread spirit

animating Thread

Constructor Detail

Server

public Server()

Creates a server socket. Waits for connections. No argument version prompts users for port information.

Server

public Server(int port)

Creates a server socket. Waits for connections.

Parameters:

port - The integer representing the port number to listen on.

Method Detail

listenOn

protected void listenOn(int port)

Helper method to actually open the ServerSocket and intialize other state. Also spawns Thread to continue listening. Called internally.

Parameters:

port - The integer representing the port number to listen on.

run

public void run()

Wait loop to service the ServerSocket. Called by this server's Thread. Should not be called externally. Each time that a connection is recieved, forks a BabySitter to handle that connection.

Specified by:

run in interface java.lang.Runnable

removeBabySitter

protected void removeBabySitter(BabySitter bbst)

Removes a BabySitter for the list of babySitters.

Parameters:

bbst - the BabySitter to be remooved from use.

spawnBabySitter

protected void spawnBabySitter(java.net.Socket s)

Creates a BabySitter with the client socket passed and adds it to the list of BabySitters.

Parameters:

s - the client socket that this BabySitter will handle

sendToAllExcept

protected void sendToAllExcept(java.lang.String s,
                               BabySitter bbst)

Sends the string passed in to all clients accept the one represented by the BabySitter passed in.

Parameters:

s - the string to send

bbst - the BabySitter that handle the client that we don't want to send to (the client that the message came from).