de.netseeker.ejoe.concurrent
Class ThreadPoolResizer

java.lang.Object
  java.util.TimerTask
      de.netseeker.ejoe.concurrent.ThreadPoolResizer

All Implemented Interfaces:

java.lang.Runnable

public final class ThreadPoolResizer
extends java.util.TimerTask

A controller thread which monitors a ThreadService and ensures that the limit of worker threads within the ThreadService will be adjusted according to the workload.

Since:

0.3.9.1

Author:

netseeker

Constructor Summary

ThreadPoolResizer(ThreadService pool, int maxPoolSize, long millisBeforeShrink)
Creates a new instance of ThreadPoolResizer, which can be scheduled via using a Timer and will monitor and eventually resize the given ThreadService up to the given limit of workers by checking the workload of the pool.

Method Summary

void

run()

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadPoolResizer

public ThreadPoolResizer(ThreadService pool,
                         int maxPoolSize,
                         long millisBeforeShrink)

Creates a new instance of ThreadPoolResizer, which can be scheduled via using a Timer and will monitor and eventually resize the given ThreadService up to the given limit of workers by checking the workload of the pool. If the workload is very high in all checks during the given period (millisBeforeShrink) the amount of workers in the monitored ThreadService will be increased to a calculated size between 1 and the given limit of workers. If the workload is too low the amount of workers will get reduced.

Parameters:

pool - a ThreadService to monitor

maxPoolSize - the limit of worker threads for the ThreadService

millisBeforeShrink - the period before the ThreadService will get resized

Method Detail

run

public void run()

Specified by:

run in interface java.lang.Runnable

Specified by:

run in class java.util.TimerTask