net.sourceforge.java.util.threads
Class ThreadPool

java.lang.Object
  net.sourceforge.java.util.threads.ThreadPool

public class ThreadPool

extends Object

Simple ThreadPool implementation

Author:

Sebastian Machhausen

Field Summary

private int	activeThreadCount The number of currently active Threads
private Map	activeThreads Maps Runnables to the Threads they are running in.
private static int	DEFAULT_POOL_SIZE The default size to use for ThreadPool instances.
private int	size The maximum number of Threads in the ThreaPool.

Constructor Summary

ThreadPool()
Creates a new ThreadPool with the default size.

ThreadPool(int size)
Creates a new ThreadPool with the specified size:

Method Summary

Thread	getThread(Runnable runnable) Gets a new Thread that runs the specified Runnable from this ThreadPool.
boolean	isFreeThreadAvailable() Returns true if a free Thread is currently available in this ThreadPool.
void	shutdown() Performs a safe shutdown of all currently running Threads in this ThreadPool.
void	threadFinished(Runnable runnable) Notifies this ThreadPool that the specified Runnable has finished its work.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_POOL_SIZE

private static final int DEFAULT_POOL_SIZE

The default size to use for ThreadPool instances.

See Also:

Constant Field Values

activeThreadCount

private int activeThreadCount

The number of currently active Threads

size

private int size

The maximum number of Threads in the ThreaPool.

activeThreads

private Map activeThreads

Maps Runnables to the Threads they are running in.

Constructor Detail

ThreadPool

public ThreadPool()

Creates a new ThreadPool with the default size.

See Also:

ThreadPool(int), DEFAULT_POOL_SIZE

ThreadPool

public ThreadPool(int size)

Creates a new ThreadPool with the specified size:

Parameters:

size - the size to use for the ThreadPool instance

See Also:

ThreadPool()

Method Detail

getThread

public Thread getThread(Runnable runnable)

Gets a new Thread that runs the specified Runnable from this ThreadPool.

Parameters:

runnable - the Runnable to run in the created Thread

Returns:

the created Thread

isFreeThreadAvailable

public boolean isFreeThreadAvailable()

Returns true if a free Thread is currently available in this ThreadPool.

Returns:

true if a free Thread is currently available in this ThreadPool; false otherwise

threadFinished

public void threadFinished(Runnable runnable)

Notifies this ThreadPool that the specified Runnable has finished its work. This means that the Thread it was running in is freed.

Parameters:

runnable - the Runnable that finished its work

shutdown

public void shutdown()

Performs a safe shutdown of all currently running Threads in this ThreadPool.