com.sun.grizzly.util.QueueLimitedThreadPool Maven / Gradle / Ivy
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package com.sun.grizzly.util;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Need to evaluate queuesize limit perf implications on this fixedpool variant.
* The atomic counter can in theory approach synchronized (lack of) scalability
* in heavy load situatuions.
*
* @author gustav trede
*/
final class QueueLimitedThreadPool extends FixedThreadPool{
private final int maxQueuedTasks;
private final AtomicInteger queueSize = new AtomicInteger();
/**
* @param name
* @param poolsize
* @param threadFactory {@link ThreadFactory}
* @param workQueue {@link BlockingQueue}
* @param maxQueuedTasks
*/
QueueLimitedThreadPool(String name, int poolsize,int maxQueuedTasks,
ThreadFactory threadFactory,BlockingQueue workQueue,
ThreadPoolMonitoringProbe probe) {
super(name,poolsize,workQueue,threadFactory,probe);
if (maxQueuedTasks < 0)
throw new IllegalArgumentException("maxQueuedTasks < 0");
this.maxQueuedTasks = maxQueuedTasks;
}
@Override
public final void execute(Runnable command) {
if (command == null) { // must nullcheck to ensure queuesize is valid
throw new IllegalArgumentException("Runnable task is null");
}
if (running){
if (queueSize.incrementAndGet() <= maxQueuedTasks
&& workQueue.offer(command)) {
onTaskQueued(command);
return;
}
onTaskQueueOverflow();
return;
}
throw new RejectedExecutionException("ThreadPool is not running");
}
@Override
protected void onTaskQueueOverflow() {
queueSize.decrementAndGet();
super.onTaskQueueOverflow();
}
@Override
public int getQueueSize() {
return queueSize.get();
}
@Override
public int getMaxQueuedTasksCount() {
return maxQueuedTasks;
}
@Override
protected final void beforeExecute(Thread t, Runnable r) {
super.beforeExecute(t, r);
queueSize.decrementAndGet();
}
}