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Reference Implementation for JSR 236 - Concurrency Utilities for Java EE
/*
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*
* Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* 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_1_1.html
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* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
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*/
package org.glassfish.enterprise.concurrent;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import javax.enterprise.concurrent.ManageableThread;
import javax.enterprise.concurrent.ManagedThreadFactory;
import org.glassfish.enterprise.concurrent.internal.ManagedFutureTask;
import org.glassfish.enterprise.concurrent.spi.ContextHandle;
import org.glassfish.enterprise.concurrent.spi.ContextSetupProvider;
/**
* Implementation of ManagedThreadFactory interface.
*/
public class ManagedThreadFactoryImpl implements ManagedThreadFactory {
private List threads;
private boolean stopped = false;
private Lock lock; // protects threads and stopped
private String name;
final private ContextSetupProvider contextSetupProvider;
private ContextHandle contextHandleForSetup;
private int priority;
private long hungTaskThreshold = 0L; // in milliseconds
private boolean longRunningTasks;
public ManagedThreadFactoryImpl(String name) {
this(name, null, Thread.NORM_PRIORITY, false);
}
public ManagedThreadFactoryImpl(String name, ContextServiceImpl contextService) {
this(name, contextService, Thread.NORM_PRIORITY, false);
}
public ManagedThreadFactoryImpl(String name,
ContextServiceImpl contextService,
int priority,
boolean longRunningTasks) {
this.name = name;
this.contextSetupProvider = contextService != null? contextService.getContextSetupProvider(): null;
if (contextSetupProvider != null) {
contextHandleForSetup = contextSetupProvider.saveContext(contextService);
}
this.priority = priority;
this.longRunningTasks = longRunningTasks;
threads = new ArrayList();
lock = new ReentrantLock();
}
public String getName() {
return name;
}
public ContextHandle getContextHandleForSetup() {
return contextHandleForSetup;
}
public long getHungTaskThreshold() {
return hungTaskThreshold;
}
public void setHungTaskThreshold(long hungTaskThreshold) {
this.hungTaskThreshold = hungTaskThreshold;
}
@Override
public Thread newThread(Runnable r) {
lock.lock();
try {
if (stopped) {
// do not create new thread if stopped
return null;
}
ManagedThread newThread = new ManagedThread(r);
newThread.setPriority(priority);
if (longRunningTasks) {
newThread.setDaemon(true);
}
threads.add(newThread);
return newThread;
}
finally {
lock.unlock();
}
}
void removeThread(ManagedThread t) {
lock.lock();
try {
threads.remove(t);
}
finally {
lock.unlock();
}
}
public void taskStarting(Thread t, ManagedFutureTask task) {
if (t instanceof ManagedThread) {
ManagedThread mt = (ManagedThread) t;
// called in thread t, so no need to worry about synchronization
mt.taskStartTime = System.currentTimeMillis();
mt.task = task;
}
}
public void taskDone(Thread t) {
if (t instanceof ManagedThread) {
ManagedThread mt = (ManagedThread) t;
// called in thread t, so no need to worry about synchronization
mt.taskStartTime = 0L;
mt.task = null;
}
}
/**
* Stop the ManagedThreadFactory instance. This should be used by the
* component that creates the ManagedThreadFactory when the component is
* stopped. All threads that this ManagedThreadFactory has created using
* the #newThread() method are interrupted.
*/
public void stop() {
lock.lock();
try {
stopped = true;
// interrupt all the threads created by this factory
Iterator iter = threads.iterator();
while(iter.hasNext()) {
ManagedThread t = iter.next();
try {
t.shutdown(); // mark threads as shutting down
t.interrupt();
} catch (SecurityException ignore) {
}
}
}
finally {
lock.unlock();
}
}
/**
* ManageableThread to be returned by {@code ManagedThreadFactory.newThread()}
*/
class ManagedThread extends Thread implements ManageableThread {
volatile long taskStartTime = 0L;
volatile ManagedFutureTask task = null;
volatile boolean shutdown = false;
public ManagedThread(Runnable target) {
super(target);
}
@Override
public void run() {
ContextHandle handle = null;
try {
if (contextHandleForSetup != null) {
handle = contextSetupProvider.setup(contextHandleForSetup);
}
super.run();
} catch (Throwable t) {
t.printStackTrace();
} finally {
if (handle != null) {
contextSetupProvider.reset(handle);
}
removeThread(this);
}
}
long getTaskRunTime(long now) {
if (taskStartTime > 0) {
long taskRunTime = now - taskStartTime;
return taskRunTime > 0? taskRunTime: 0;
}
return 0;
}
boolean isTaskHung(long now) {
if (hungTaskThreshold > 0) {
return getTaskRunTime(now) - hungTaskThreshold > 0;
}
return false;
}
boolean cancelTask() {
if (task != null) {
return task.cancel(true);
}
return false;
}
String getTaskIdentityName() {
if (task != null) {
return task.getTaskIdentityName();
}
return "null";
}
/**
* Marks the thread for shutdown so application components could
* check the status of this thread and finish any work as soon
* as possible.
*/
public void shutdown() {
shutdown = true;
}
@Override
public boolean isShutdown() {
return shutdown;
}
}
}