com.mortbay.Util
Class ThreadPool

java.lang.Object
  |
  +--com.mortbay.Util.ThreadPool

Direct Known Subclasses:

IO

public class ThreadPool

extends java.lang.Object

A pool of threads.

Avoids the expense of thread creation by pooling threads after their run methods exit for reuse.

If the maximum pool size is reached, jobs wait for a free thread. By default there is no maximum pool size.

Usage

Works well with inner classes:

 final ArgClass myArg = new ArgClass(...);
 threadPool.run(new Runnable() { public void run() { myHandler(myArg); }} );
 

Version:

$Id: ThreadPool.java,v 1.11 1999/09/22 15:08:39 gregw Exp $

Author:

Juancarlo Aņez , Greg Wilkins

Constructor Summary

ThreadPool()
Constructor.

ThreadPool(int maxThreads)
Constructor.

ThreadPool(int minThreads, int maxThreads, java.lang.String name, int maxIdleTimeMs)
Constructor.

ThreadPool(int maxThreads, java.lang.String name)
Constructor.

ThreadPool(int maxThreads, java.lang.String name, int maxIdleTimeMs)
Constructor.

Method Summary

int	getMaxSize()
int	getMinSize()
int	getSize()
protected void	handle(java.lang.Object job) Handle a job.
void	run(java.lang.Object job) Run job

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadPool

public ThreadPool()

Constructor.

ThreadPool

public ThreadPool(int maxThreads)

Constructor.

Parameters:

maxThreads - Maximum number of handler threads.

ThreadPool

public ThreadPool(int maxThreads,
                  java.lang.String name)

Constructor.

Parameters:

maxThreads - Maximum number of handler threads.

name - Name of the thread.

ThreadPool

public ThreadPool(int maxThreads,
                  java.lang.String name,
                  int maxIdleTimeMs)

Constructor.

Parameters:

maxThreads - Maximum number of handler threads.

name - Name of the thread.

maxIdleTimeMs - Idle time in milliseconds before a handler thread dies.

ThreadPool

public ThreadPool(int minThreads,
                  int maxThreads,
                  java.lang.String name,
                  int maxIdleTimeMs)

Constructor.

Parameters:

minThreads - Minimum number of handler threads.

maxThreads - Maximum number of handler threads.

name - Name of the thread

maxIdleTimeMs - Idle time in milliseconds before a handler thread dies.

Method Detail

getSize

public int getSize()

getMinSize

public int getMinSize()

getMaxSize

public int getMaxSize()

run

public void run(java.lang.Object job)
         throws java.lang.InterruptedException

Run job

Parameters:

job. - If the job is derived from Runnable, the run method is called, otherwise it is passed as the argument to the handle method.

handle

protected void handle(java.lang.Object job)

Handle a job. Unless the job is an instance of Runnable, then this method must be specialized by a derived class.

Parameters:

job -