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package com.sun.grizzly.util;
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
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 {
private final Queue workQueue;
protected int maxQueuedTasks = -1;
private final AtomicLong completedTasksCount = new AtomicLong();
private int largestThreadPoolSize;
/**
*
*/
public SyncThreadPool() {
this("Grizzly", DEFAULT_MIN_THREAD_COUNT, DEFAULT_MAX_THREAD_COUNT,
DEFAULT_IDLE_THREAD_KEEPALIVE_TIMEOUT, TimeUnit.MILLISECONDS);
}
/**
*
* @param name
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit {@link TimeUnit}
*/
public SyncThreadPool(String name, int corePoolsize,
int maxPoolSize, long keepAliveTime, TimeUnit timeUnit) {
this(name, corePoolsize, maxPoolSize, keepAliveTime, timeUnit, null);
}
/**
*
* @param name
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit {@link TimeUnit}
* @param threadFactory {@link ThreadFactory}
*/
public SyncThreadPool(String name, int corePoolsize,
int maxPoolSize, long keepAliveTime, TimeUnit timeUnit,
ThreadFactory threadFactory) {
this(name, corePoolsize, maxPoolSize, keepAliveTime, timeUnit,
threadFactory, new LinkedList(), -1);
}
/**
*
* @param name
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit {@link TimeUnit}
* @param threadFactory {@link ThreadFactory}
* @param workQueue {@link BlockingQueue}
* @param maxQueuedTasks
*/
public SyncThreadPool(String name, int corePoolsize, int maxPoolSize,
long keepAliveTime, TimeUnit timeUnit, ThreadFactory threadFactory,
Queue workQueue, int maxQueuedTasks) {
this(name, corePoolsize, maxPoolSize, keepAliveTime, timeUnit,
threadFactory, new LinkedList(), maxQueuedTasks,null);
}
/**
*
* @param name
* @param corePoolsize
* @param maxPoolSize
* @param keepAliveTime
* @param timeUnit
* @param threadFactory
* @param workQueue
* @param maxQueuedTasks
* @param probe
*/
public SyncThreadPool(final String name, int corePoolsize, int maxPoolSize,
long keepAliveTime, TimeUnit timeUnit, ThreadFactory threadFactory,
Queue workQueue, int maxQueuedTasks,
ThreadPoolMonitoringProbe probe) {
super(probe,name,threadFactory,maxPoolSize);
if (keepAliveTime < 0) {
throw new IllegalArgumentException("keepAliveTime < 0");
}
if (timeUnit == null) {
throw new IllegalArgumentException("timeUnit == null");
}
if (workQueue == null) {
workQueue = new LinkedList();
}
setPoolSizes(corePoolsize, maxPoolSize);
this.keepAliveTime = TimeUnit.MILLISECONDS.convert(keepAliveTime, timeUnit);
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;
final int workerQueueSize = workQueue.size();
if ((maxQueuedTasks < 0 || workerQueueSize < maxQueuedTasks) &&
workQueue.offer(task)) {
onTaskQueued(task);
} else {
onTaskQueueOverflow();
}
final boolean isCore = (currentPoolSize < corePoolSize);
if (isCore ||
(currentPoolSize < maxPoolSize &&
idleThreadsNumber < workerQueueSize + 1)) {
startWorker(new SyncThreadWorker(isCore));
} else if (idleThreadsNumber == 0) {
onMaxNumberOfThreadsReached();
} else {
statelock.notify();
}
}
}
/**
* must hold statelock while calling this method.
* @param wt
*/
@Override
protected void startWorker(Worker wt) {
super.startWorker(wt);
currentPoolSize++;
activeThreadsCount++;
if (currentPoolSize > largestThreadPoolSize) {
largestThreadPoolSize = currentPoolSize;
}
}
/**
* {@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;
}
}
@Override
protected void afterExecute(Thread thread,Runnable r, Throwable t) {
super.afterExecute(thread,r, t);
completedTasksCount.incrementAndGet();
}
@Override
protected void poisonAll() {
int size = currentPoolSize;
final Queue q = getQueue();
while (size-- > 0) {
q.offer(poison);
}
}
@Override
public String toString() {
return super.toString()+
", min-threads="+getCorePoolSize()+
", max-threads="+getMaximumPoolSize()+
", max-queue-size="+getMaxQueuedTasksCount();
}
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 (!running ||
(!core && currentPoolSize > maxPoolSize)) {
// if maxpoolsize becomes lower during runtime we kill of the
return null;
}
Runnable r = workQueue.poll();
long localKeepAlive = keepAliveTime;
while (r == null) {
final long startTime = System.currentTimeMillis();
statelock.wait(localKeepAlive);
r = workQueue.poll();
localKeepAlive -= (System.currentTimeMillis() - startTime);
// Less than 100 millis remainder will consider as keepalive timeout
if (!running || (!core &&
(r != null || localKeepAlive < 100))) {
break;
}
}
return r;
} finally {
activeThreadsCount++;
}
}
}
}
}
