/*
* JBoss, Home of Professional Open Source.
* Copyright 2010, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.threads;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import org.jboss.msc.inject.Injector;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
import org.jboss.msc.value.InjectedValue;
/**
* Service responsible for creating, starting and stopping a scheduled thread pool executor.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public final class ScheduledThreadPoolService implements Service<ManagedScheduledExecutorService> {
private final InjectedValue<ThreadFactory> threadFactoryValue = new InjectedValue<ThreadFactory>();
private ManagedScheduledExecutorService executor;
private StopContext context;
private final int maxThreads;
private final TimeSpec keepAlive;
public ScheduledThreadPoolService(final int maxThreads, final TimeSpec keepAlive) {
this.maxThreads = maxThreads;
this.keepAlive = keepAlive;
}
public void start(final StartContext context) throws StartException {
ScheduledThreadPoolExecutor scheduledExecutor = new ExecutorImpl(0, threadFactoryValue.getValue());
scheduledExecutor.setCorePoolSize(maxThreads);
if (keepAlive != null) scheduledExecutor.setKeepAliveTime(keepAlive.getDuration(), keepAlive.getUnit());
final ManagedScheduledExecutorService executorService = new ManagedScheduledExecutorService(scheduledExecutor);
synchronized (this) {
executor = executorService;
}
}
public void stop(final StopContext context) {
final ManagedScheduledExecutorService executor;
synchronized (this) {
executor = this.executor;
this.context = context;
this.executor = null;
}
context.asynchronous();
executor.internalShutdown();
}
public ManagedScheduledExecutorService getValue() throws IllegalStateException {
final ManagedScheduledExecutorService value;
synchronized (this) {
value = this.executor;
}
if (value == null) {
throw ThreadsLogger.ROOT_LOGGER.scheduledThreadPoolExecutorUninitialized();
}
return value;
}
public Injector<ThreadFactory> getThreadFactoryInjector() {
return threadFactoryValue;
}
public int getActiveCount() {
final ManagedScheduledExecutorService executor = getValue();
return executor.getActiveCount();
}
public long getCompletedTaskCount() {
final ManagedScheduledExecutorService executor = getValue();
return executor.getCompletedTaskCount();
}
public int getCurrentThreadCount() {
final ManagedScheduledExecutorService executor = getValue();
return executor.getPoolSize();
}
public int getLargestThreadCount() {
final ManagedScheduledExecutorService executor = getValue();
return executor.getLargestPoolSize();
}
public long getTaskCount() {
final ManagedScheduledExecutorService executor = getValue();
return executor.getTaskCount();
}
public int getQueueSize() {
final ManagedScheduledExecutorService executor = getValue();
return executor.getQueueSize();
}
private class ExecutorImpl extends ScheduledThreadPoolExecutor {
ExecutorImpl(final int corePoolSize, final ThreadFactory threadFactory) {
super(corePoolSize, threadFactory);
}
protected void terminated() {
super.terminated();
StopContext context;
synchronized (ScheduledThreadPoolService.this) {
context = ScheduledThreadPoolService.this.context;
ScheduledThreadPoolService.this.context = null;
}
context.complete();
}
}
}