org.sblim.cimclient.internal.util
Class ThreadPool

java.lang.Object
  org.sblim.cimclient.internal.util.ThreadPool

public class ThreadPool
extends Object

Class ThreadPool implements a pool that manages threads and executes submitted tasks using this threads.

Constructor Summary

ThreadPool(int pMinPoolSize, int pMaxPoolSize, int pToleratedBacklog, long pToleratedIdle, ThreadGroup pGroup, String pWorkerName)
Ctor

Method Summary

boolean	execute(Runnable task) Submits a task for execution
protected ThreadGroup	getGroup() Gets the associated thread group
Runnable	getNextTask(org.sblim.cimclient.internal.util.ThreadPool.Worker worker) Get a new task.
protected void	removeWorker(org.sblim.cimclient.internal.util.ThreadPool.Worker worker) Removes a worker from the pool.
void	shutdown() Shuts down the thread pool and all workers
void	taskCompleted() Notifies the pool that at task was completed.
void	taskStarted() Notifies the pool that at task was started.

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadPool

public ThreadPool(int pMinPoolSize,
                  int pMaxPoolSize,
                  int pToleratedBacklog,
                  long pToleratedIdle,
                  ThreadGroup pGroup,
                  String pWorkerName)

Ctor

Parameters:

pMinPoolSize - The minimal pool size. The pool will always keep at least this number of worker threads alive even in no load situations.

pMaxPoolSize - The maximal pool size. The pool will create up to that number of worker threads on heavy load.

pToleratedBacklog - The task backlog that is tolerated before an additional worker is created

pToleratedIdle - The idle time of a worker that is tolerated before the worker is destroyed

pGroup - Then thread group to put the worker threads in

pWorkerName - The name to use for worker threads

Method Detail

execute

public boolean execute(Runnable task)

Submits a task for execution

Parameters:

task - The task

Returns:

true if the task was executed or enqueued, false otherwise.

removeWorker

protected void removeWorker(org.sblim.cimclient.internal.util.ThreadPool.Worker worker)

Removes a worker from the pool.

Parameters:

worker - The worker

getGroup

protected ThreadGroup getGroup()

Gets the associated thread group

Returns:

The thread group

getNextTask

public Runnable getNextTask(org.sblim.cimclient.internal.util.ThreadPool.Worker worker)
                     throws InterruptedException

Get a new task. If no task was available during the timeout period the calling worker might be killed if more than the minimum number of workers exist

Parameters:

worker - The worker asking for a new task

Returns:

The next available task from the queue. If no task is available waits for idle timeout and returns null afterwards.

Throws:

InterruptedException - on interrupt

taskStarted

public void taskStarted()

Notifies the pool that at task was started. Effectively decrements the idle worker count.

taskCompleted

public void taskCompleted()

Notifies the pool that at task was completed. Effectively increments the idle worker count.

shutdown

public void shutdown()

Shuts down the thread pool and all workers