/*
* 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 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;
import org.jboss.threads.EventListener;
import org.jboss.threads.JBossExecutors;
import org.jboss.threads.QueuelessExecutor;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadFactory;
/**
* Service responsible for creating, starting and stopping a thread pool executor with no queue.
*
* @author John E. Bailey
*/
public class QueuelessThreadPoolService implements Service<ExecutorService> {
private final InjectedValue<ThreadFactory> threadFactoryValue = new InjectedValue<ThreadFactory>();
private final InjectedValue<Executor> handoffExecutorValue = new InjectedValue<Executor>();
private QueuelessExecutor executor;
private ExecutorService value;
private int maxThreads;
private boolean blocking;
private TimeSpec keepAlive;
public QueuelessThreadPoolService(int maxThreads, boolean blocking, TimeSpec keepAlive) {
this.maxThreads = maxThreads;
this.blocking = blocking;
this.keepAlive = keepAlive;
}
public synchronized void start(final StartContext context) throws StartException {
final TimeSpec keepAliveSpec = keepAlive;
long keepAlive = keepAliveSpec == null ? Long.MAX_VALUE : keepAliveSpec.getUnit().toMillis(keepAliveSpec.getDuration());
executor = new QueuelessExecutor(threadFactoryValue.getValue(), JBossExecutors.directExecutor(), handoffExecutorValue.getOptionalValue(), keepAlive);
executor.setMaxThreads(maxThreads);
executor.setBlocking(blocking);
value = JBossExecutors.protectedExecutorService(executor);
}
public synchronized void stop(final StopContext context) {
final QueuelessExecutor executor = this.executor;
if (executor == null) {
throw new IllegalStateException();
}
context.asynchronous();
executor.shutdown();
executor.addShutdownListener(new EventListener<StopContext>() {
public void handleEvent(final StopContext stopContext) {
stopContext.complete();
}
}, context);
this.executor = null;
value = null;
}
public synchronized ExecutorService getValue() throws IllegalStateException {
final ExecutorService value = this.value;
if (value == null) {
throw new IllegalStateException();
}
return value;
}
public Injector<ThreadFactory> getThreadFactoryInjector() {
return threadFactoryValue;
}
public Injector<Executor> getHandoffExecutorInjector() {
return handoffExecutorValue;
}
public synchronized void setMaxThreads(int maxThreads) {
this.maxThreads = maxThreads;
final QueuelessExecutor executor = this.executor;
if(executor != null) {
executor.setMaxThreads(maxThreads);
}
}
public synchronized void setBlocking(boolean blocking) {
this.blocking = blocking;
final QueuelessExecutor executor = this.executor;
if(executor != null) {
executor.setBlocking(blocking);
}
}
public synchronized void setKeepAlive(TimeSpec keepAliveSpec) {
keepAlive = keepAliveSpec;
final QueuelessExecutor executor = this.executor;
if(executor != null) {
long keepAlive = keepAliveSpec == null ? Long.MAX_VALUE : keepAliveSpec.getDuration();
executor.setKeepAliveTime(keepAlive);
}
}
}