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* and Distribution License("CDDL") (collectively, the "License"). You
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package org.glassfish.enterprise.concurrent;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.concurrent.ManagedThreadFactory;
import org.glassfish.enterprise.concurrent.internal.ManagedFutureTask;
import org.glassfish.enterprise.concurrent.internal.ThreadExpiredException;
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;
// A non-null ContextService should be provided if thread context should
// be setup before running the Runnable passed in through the newThread
// method.
// Context service could be null if the ManagedThreadFactoryImpl is
// used for creating threads for ManagedExecutorService, where it is
// not necessary to set up thread context at thread creation time. In that
// case, thread context is set up before running each task.
final private ContextServiceImpl contextService;
private int priority;
private long hungTaskThreshold = 0L; // in milliseconds
private AtomicInteger threadIdSequence = new AtomicInteger();
public static final String MANAGED_THREAD_FACTORY_STOPPED = "ManagedThreadFactory is stopped";
public ManagedThreadFactoryImpl(String name) {
this(name, null, Thread.NORM_PRIORITY);
}
public ManagedThreadFactoryImpl(String name, ContextServiceImpl contextService) {
this(name, contextService, Thread.NORM_PRIORITY);
}
public ManagedThreadFactoryImpl(String name,
ContextServiceImpl contextService,
int priority) {
this.name = name;
this.contextService = contextService;
this.contextSetupProvider = contextService != null? contextService.getContextSetupProvider(): null;
this.priority = priority;
threads = new ArrayList<>();
lock = new ReentrantLock();
}
public String getName() {
return name;
}
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 and throw IllegalStateException if stopped
throw new IllegalStateException(MANAGED_THREAD_FACTORY_STOPPED);
}
ContextHandle contextHandleForSetup = null;
if (contextSetupProvider != null) {
contextHandleForSetup = contextSetupProvider.saveContext(contextService);
}
AbstractManagedThread newThread = createThread(r, contextHandleForSetup);
newThread.setPriority(priority);
newThread.setDaemon(true);
threads.add(newThread);
return newThread;
}
finally {
lock.unlock();
}
}
protected AbstractManagedThread createThread(final Runnable r, final ContextHandle contextHandleForSetup) {
if (System.getSecurityManager() == null) {
return new ManagedThread(r, contextHandleForSetup);
} else {
return (ManagedThread) AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public Object run() {
return new ManagedThread(r, contextHandleForSetup);
}
});
}
}
protected void removeThread(ManagedThread t) {
lock.lock();
try {
threads.remove(t);
}
finally {
lock.unlock();
}
}
/**
* Return an array of threads in this ManagedThreadFactoryImpl
* @return an array of threads in this ManagedThreadFactoryImpl.
* It returns null if there is no thread.
*/
protected Collection getThreads() {
Collection result = null;
lock.lock();
try {
if (!threads.isEmpty()) {
result = new ArrayList<>(threads);
}
}
finally {
lock.unlock();
}
return result;
}
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()) {
AbstractManagedThread 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()}
*/
public class ManagedThread extends AbstractManagedThread {
final ContextHandle contextHandleForSetup;
volatile ManagedFutureTask task = null;
volatile long taskStartTime = 0L;
public ManagedThread(Runnable target, ContextHandle contextHandleForSetup) {
super(target);
setName(name + "-Thread-" + threadIdSequence.incrementAndGet());
this.contextHandleForSetup = contextHandleForSetup;
}
@Override
public void run() {
ContextHandle handle = null;
try {
if (contextHandleForSetup != null) {
handle = contextSetupProvider.setup(contextHandleForSetup);
}
if (shutdown) {
// start thread in interrupted state if already marked for shutdown
this.interrupt();
}
super.run();
} catch (ThreadExpiredException ex) {
Logger.getLogger("org.glassfish.enterprise.concurrent").log(Level.INFO, ex.toString());
} catch (Throwable t) {
Logger.getLogger("org.glassfish.enterprise.concurrent").log(Level.SEVERE, t.toString());
} finally {
if (handle != null) {
contextSetupProvider.reset(handle);
}
removeThread(this);
}
}
@Override
boolean cancelTask() {
if (task != null) {
return task.cancel(true);
}
return false;
}
@Override
public String getTaskIdentityName() {
if (task != null) {
return task.getTaskIdentityName();
}
return "null";
}
@Override
public long getTaskRunTime(long now) {
if (task != null && taskStartTime > 0) {
long taskRunTime = now - taskStartTime;
return taskRunTime > 0 ? taskRunTime : 0;
}
return 0;
}
@Override
public long getThreadStartTime() {
return threadStartTime;
}
@Override
boolean isTaskHung(long now) {
if (hungTaskThreshold > 0) {
return getTaskRunTime(now) - hungTaskThreshold > 0;
}
return false;
}
}
}
