edu.sdsc.inca.protocol
Class MessageHandlerFactory

java.lang.Object
  edu.sdsc.inca.protocol.MessageHandlerFactory

public class MessageHandlerFactory
extends java.lang.Object

Author:

Cathie Olschanowsky This factory reads a protocol stream and instantiates MessageHandler classes. MessageHandler classes can be added using the addTask method.

Constructor Summary

MessageHandlerFactory()

Method Summary

static MessageHandler	newInstance(ProtocolReader reader) Returns an instance of a MessageHandler based on the next command coming over a connection.
static void	registerMessageHandler(java.lang.String command, java.lang.String handler) Add a task to the known list.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageHandlerFactory

public MessageHandlerFactory()

Method Detail

newInstance

public static MessageHandler newInstance(ProtocolReader reader)
                                  throws java.lang.IllegalAccessException,
                                         java.lang.InstantiationException,
                                         java.io.IOException,
                                         ProtocolException

Returns an instance of a MessageHandler based on the next command coming over a connection. Returns null on end of stream.

Parameters:

reader - the reader from which the next command is read

Returns:

the Task Handler mapped to the next command.

Throws:

java.lang.IllegalAccessException

java.lang.InstantiationException - Some problem instatiating the implemenation

java.io.IOException - Problem reader next command

ProtocolException - Bad data/unknown command in the input stream

registerMessageHandler

public static void registerMessageHandler(java.lang.String command,
                                          java.lang.String handler)

Add a task to the known list. Every server that uses this class will need to do this.

Parameters:

command - The Command as it will be seen in the protocol

handler - The handler that should be invoked upon this command