Class prominence.chat.ChatSystemHandler 
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Class prominence.chat.ChatSystemHandler 

java.lang.Object
   |
   +----java.lang.Thread
           |
           +----prominence.msg.GenericHandler
                   |
                   +----prominence.chat.ChatSystemHandler
public class ChatSystemHandler
extends GenericHandler
An extension to the GenericHandler class that supports message source identification and a naming registry, i.e., each message is accompanied by the name of the sender, and the server announces clients' joining and leaving.
See Also:
ChatSystemServer, GenericHandler

Constructor Index

o ChatSystemHandler(Hashtable, InputStream, OutputStream)
Creates a new ChatSystemHandler with communications streams and a routing table.

Method Index

o accept(String)
Attempts to register the client in the routing table.
o announce(boolean)
Announces the client joining or leaving to all other users.
o listUsers()
Lists all current clients to the new client.
o send(byte[], MessageOutput)
Sends a message to the specified destination.

Constructors

o ChatSystemHandler 
  public ChatSystemHandler(Hashtable routes,
                           InputStream i,
                           OutputStream o)
Creates a new ChatSystemHandler with communications streams and a routing table.
Parameters:
routes - The global routing table
i - An InputStream from the client
o - An OutputStream to the client

Methods

o accept 
  protected void accept(String name) throws IOException
Attempts to register the client in the routing table. If successful, calls the superclass execute() method to process incoming messages.

Lists the current clients to the new client, and announces the new client joining and leaving to other clients.

Parameters:
name - The client name
Throws: IOException
Occurs if a problem arises with the communication streams.
Overrides:
accept in class GenericHandler
See Also:
execute, announce, listUsers
o announce 
  protected void announce(boolean isJoin) throws IOException
Announces the client joining or leaving to all other users.
Parameters:
isJoin - Whether the client is joining or leaving.
Throws: IOException
Should not occur.
See Also:
Registry
o listUsers 
  protected void listUsers() throws IOException
Lists all current clients to the new client.
Throws: IOException
Should not occur.
See Also:
Registry
o send 
  protected void send(byte buffer[],
                      MessageOutput o) throws IOException
Sends a message to the specified destination. Does not send a message to self, or if destination is null.

Attaches the client name to the message so the recipient can identify the sender.

Parameters:
buffer - The message to be sent
o - The destination MessageOutput
Throws: IOException
Occurs if there is a problem sending the message.
Overrides:
send in class GenericHandler
See Also:
demux 
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