com.mischiefbox.pollserve
Class MessageHandler

java.lang.Object
  |
  +--com.mischiefbox.pollserve.MessageHandler

All Implemented Interfaces:

Runnable

public class MessageHandler

extends Object

implements Runnable

Responsible for retrieving messages from the input queue, passing them off to the proper processor thread, and sending responses back to the output queue.

Additionally, manages the processor thread pool.

Version:

$Id$

Author:

Chris Jones

Field Summary

protected int	MAX_PROCESSORS The maximum number of processor threads allowed.
protected static int	SLEEP_MILLIS The time to sleep between fetches from the input queue.

Constructor Summary

MessageHandler(Queue qInput, Queue qOutput)
Creates a new message handler.

Method Summary

void	run() Check for new messages on the input queue, get a new processor thread from the processor thread pool, and pass the message to the processor thread.
void	shutdown() Shut down the message handler and the message processor thread pool.

Methods inherited from class java.lang.Object

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

Field Detail

SLEEP_MILLIS

protected static int SLEEP_MILLIS

The time to sleep between fetches from the input queue.

MAX_PROCESSORS

protected int MAX_PROCESSORS

The maximum number of processor threads allowed.

In effect, the maximum number of commands permitted to execute at once. This number should be tuned for each installation based on the number of requests and the type of system (multi-processor systems or systems that implement Java threads as microthreads will tend to do better with more threads than single processor systems or systems that implement Java threads as system processes).

This value is passed to the thread pool.

Constructor Detail

MessageHandler

public MessageHandler(Queue qInput,
                      Queue qOutput)

Creates a new message handler.

Parameters:

qInput - the message input queue.

qOutput - the message output queue.

Method Detail

shutdown

public void shutdown()

Shut down the message handler and the message processor thread pool.

run

public void run()

Check for new messages on the input queue, get a new processor thread from the processor thread pool, and pass the message to the processor thread.

Specified by:

run in interface Runnable