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/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
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* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
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package com.sun.grizzly.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/**
* {@link ExecutorService} implementation, which function the similar way as
* former Grizzly 1.x Pipeline based thread pools.
*
* The SyncThreadPool is sychronized similar way as Grizzly 1.x Pipeline,
* which makes thread pool more accurate when deciding to create or not
* additional worker threads.
*
*
* @author Alexey Stashok
*/
public class SyncThreadPool extends AbstractThreadPool {
protected int threadsCounter;
protected int currentPoolSize;
protected int activeThreadsCount;
private final Queue workQueue;
protected int maxQueuedTasks = -1;
private final AtomicLong completedTasksCount = new AtomicLong();
private int largestThreadPoolSize;
protected final Object statelock = new Object();
protected boolean running = true;
protected final Map workers = new HashMap();
/**
*
*/
public SyncThreadPool() {
this("Grizzly", DEFAULT_MIN_THREAD_COUNT, DEFAULT_MAX_THREAD_COUNT,
DEFAULT_IDLE_THREAD_KEEPALIVE_TIMEOUT, TimeUnit.MILLISECONDS);
}
/**
*
* @param workerprefixname
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit {@link TimeUnit}
*/
public SyncThreadPool(final String name, int corePoolsize,
int maxPoolSize, long keepAliveTime, TimeUnit timeUnit) {
this(name, corePoolsize, maxPoolSize, keepAliveTime, timeUnit, null);
}
/**
*
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit {@link TimeUnit}
* @param threadFactory {@link ThreadFactory}
*/
public SyncThreadPool(final String name, int corePoolsize,
int maxPoolSize, long keepAliveTime, TimeUnit timeUnit,
ThreadFactory threadFactory) {
this(name, corePoolsize, maxPoolSize, keepAliveTime, timeUnit,
threadFactory, new LinkedList(), -1);
}
/**
*
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit {@link TimeUnit}
* @param threadFactory {@link ThreadFactory}
* @param workQueue {@link BlockingQueue}
*/
public SyncThreadPool(final String name, int corePoolsize, int maxPoolSize,
long keepAliveTime, TimeUnit timeUnit, ThreadFactory threadFactory,
Queue workQueue, int maxQueuedTasks) {
if (keepAliveTime < 0) {
throw new IllegalArgumentException("keepAliveTime < 0");
}
if (timeUnit == null) {
throw new IllegalArgumentException("timeUnit == null");
}
setPoolSizes(corePoolsize, maxPoolSize);
this.keepAliveTime = TimeUnit.MILLISECONDS.convert(keepAliveTime, timeUnit);
this.name = name;
if (this.threadFactory == null) {
this.threadFactory = new SyncWorkerThreadFactory();
}
this.workQueue = workQueue;
this.maxQueuedTasks = maxQueuedTasks;
}
public void start() {
synchronized(statelock) {
while (currentPoolSize < corePoolSize) {
startWorker(new SyncThreadWorker(true));
}
}
}
public void stop() {
shutdownNow();
}
/**
* {@inheritDoc}
*/
public void execute(Runnable task) {
if (task == null) {
throw new IllegalArgumentException("Runnable task is null");
}
synchronized (statelock) {
if (!running) {
throw new RejectedExecutionException("ThreadPool is not running");
}
final int idleThreadsNumber = currentPoolSize - activeThreadsCount;
if ((maxQueuedTasks < 0 || workQueue.size() < maxQueuedTasks) &&
workQueue.offer(task)) {
onTaskQueued(task);
} else {
onTaskQueueOverflow();
throw new RejectedExecutionException("ThreadPool is full");
}
final boolean isCore = (currentPoolSize < corePoolSize);
if (isCore ||
(currentPoolSize < maxPoolSize && idleThreadsNumber == 0)) {
startWorker(new SyncThreadWorker(isCore));
} else if (idleThreadsNumber == 0) {
onMaxNumberOfThreadsReached();
} else {
statelock.notify();
}
}
}
protected void startWorker(Worker wt) {
// Must be executed in synchronized block
wt.t = threadFactory.newThread(wt);
workers.put(wt, System.currentTimeMillis());
wt.t.start();
currentPoolSize++;
activeThreadsCount++;
if (currentPoolSize > largestThreadPoolSize) {
largestThreadPoolSize = currentPoolSize;
}
}
/**
* {@inheritDoc}
*/
public List shutdownNow() {
synchronized (statelock) {
List drained = new ArrayList();
if (running) {
running = false;
drained.addAll(workQueue);
workQueue.clear();
for (Runnable task : drained) {
onTaskDequeued(task);
}
poisonAll();
//try to interrupt their current work so they can get their poison fast
for (Worker w : workers.keySet()) {
w.t.interrupt();
}
}
return drained;
}
}
/**
* {@inheritDoc}
*/
public void shutdown() {
synchronized (statelock) {
if (running) {
running = false;
poisonAll();
statelock.notifyAll();
}
}
}
private void poisonAll() {
int size = Math.max(maxPoolSize, currentPoolSize) * 4 / 3;
while (size-- > 0) {
workQueue.offer(poison);
}
}
/**
* {@inheritDoc}
*/
public boolean isShutdown() {
synchronized(statelock) {
return !running;
}
}
/**
* {@inheritDoc}
*/
public boolean isTerminated() {
synchronized(statelock) {
return !running && workers.isEmpty();
}
}
/**
* {@inheritDoc}
*/
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
throw new UnsupportedOperationException("Not supported yet.");
}
/**
* {@inheritDoc}
*/
public int getActiveCount() {
synchronized(statelock) {
return activeThreadsCount;
}
}
/**
* {@inheritDoc}
*/
public int getTaskCount() {
synchronized(statelock) {
return workQueue.size();
}
}
/**
* {@inheritDoc}
*/
public long getCompletedTaskCount() {
return completedTasksCount.get();
}
/**
* {@inheritDoc}
*/
public int getLargestPoolSize() {
synchronized(statelock) {
return largestThreadPoolSize;
}
}
/**
* {@inheritDoc}
*/
public int getPoolSize() {
synchronized(statelock) {
return currentPoolSize;
}
}
/**
* {@inheritDoc}
*/
public Queue getQueue() {
return workQueue;
}
/**
* {@inheritDoc}
*/
public int getQueueSize() {
synchronized(statelock) {
return workQueue.size();
}
}
/**
* {@inheritDoc}
*/
public int getMaxQueuedTasksCount() {
synchronized(statelock) {
return maxQueuedTasks;
}
}
/**
* {@inheritDoc}
*/
public void setMaxQueuedTasksCount(int maxQueuedTasks) {
synchronized(statelock) {
this.maxQueuedTasks = maxQueuedTasks;
}
}
/**
* {@inheritDoc}
*/
protected void setPoolSizes(int corePoolSize, int maxPoolSize) {
synchronized (statelock) {
validateNewPoolSize(corePoolSize, maxPoolSize);
this.corePoolSize = corePoolSize;
this.maxPoolSize = maxPoolSize;
}
}
/**
* {@inheritDoc}
*/
@Override
protected void onWorkerExit(Worker worker) {
super.onWorkerExit(worker);
synchronized (statelock) {
currentPoolSize--;
activeThreadsCount--;
workers.remove(worker);
}
}
/**
* {@inheritDoc}
*/
@Override
protected void beforeExecute(Thread t, Runnable r) {
super.beforeExecute(t, r);
((WorkerThreadImpl) t).createByteBuffer(false);
}
/**
* {@inheritDoc}
*/
@Override
protected void afterExecute(Runnable r, Throwable t) {
((WorkerThreadImpl) Thread.currentThread()).reset();
completedTasksCount.incrementAndGet();
super.afterExecute(r, t);
}
@Override
protected String nextThreadId() {
return Integer.toString(threadsCounter++);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder(512);
builder.append("SyncThreadPool[");
injectToStringAttributes(builder);
builder.append(']');
return builder.toString();
}
protected void injectToStringAttributes(StringBuilder sb) {
sb.append("name=").append(name);
sb.append(", min-threads=").append(getCorePoolSize());
sb.append(", max-threads=").append(getMaximumPoolSize());
sb.append(", max-queue-size=").append(getMaxQueuedTasksCount());
sb.append(", is-shutdown=").append(isShutdown());
}
protected class SyncThreadWorker extends Worker {
private final boolean core;
public SyncThreadWorker(boolean core) {
this.core = core;
}
protected Runnable getTask() throws InterruptedException {
synchronized (statelock) {
try {
activeThreadsCount--;
if (!core && currentPoolSize > maxPoolSize) {
// if maxpoolsize becomes lower during runtime we kill of the
return null;
}
Runnable r = workQueue.poll();
while (r == null) {
statelock.wait(keepAliveTime);
r = workQueue.poll();
if (!core) {
break;
}
}
return r;
} finally {
activeThreadsCount++;
}
}
}
}
private class SyncWorkerThreadFactory implements ThreadFactory {
public Thread newThread(Runnable r) {
synchronized (statelock) {
Thread thread = new WorkerThreadImpl(SyncThreadPool.this,
name + "-WorkerThread(" +
nextThreadId() + ")", r,
initialByteBufferSize);
thread.setUncaughtExceptionHandler(SyncThreadPool.this);
thread.setPriority(priority);
return thread;
}
}
}
}
