org.hornetq.core.remoting.impl.netty.SharedNioEventLoopGroup Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2005-2014 Red Hat, Inc.
 * Red Hat licenses this file to you under the Apache License, version
 * 2.0 (the "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *    http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */

/*
 * Copyright 2009 Red Hat, Inc.
 * Red Hat licenses this file to you under the Apache License, version
 * 2.0 (the "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *    http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.hornetq.core.remoting.impl.netty;

import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.ImmediateEventExecutor;
import io.netty.util.concurrent.Promise;
import org.hornetq.core.client.impl.ClientSessionFactoryImpl;
import org.hornetq.utils.HornetQThreadFactory;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @author Norman Maurer
 */
public class SharedNioEventLoopGroup extends NioEventLoopGroup
{
   private static SharedNioEventLoopGroup instance;

   private final AtomicReference> shutdown = new AtomicReference>();
   private final AtomicLong nioChannelFactoryCount = new AtomicLong();
   private final Promise terminationPromise = ImmediateEventExecutor.INSTANCE.newPromise();

   private SharedNioEventLoopGroup(int numThreads, ThreadFactory factory)
   {
      super(numThreads, factory);
   }

   private static ClassLoader getThisClassLoader()
   {
      return AccessController.doPrivileged(new PrivilegedAction()
      {
         public ClassLoader run()
         {
            return ClientSessionFactoryImpl.class.getClassLoader();
         }
      });
   }

   public static synchronized void forceShutdown()
   {
      if (instance != null)
      {
         instance.shutdown();
         instance.nioChannelFactoryCount.set(0);
         instance = null;
      }
   }

   public static synchronized SharedNioEventLoopGroup getInstance(int numThreads)
   {
      if (instance != null)
      {
         ScheduledFuture f = instance.shutdown.getAndSet(null);
         if (f != null)
         {
            f.cancel(false);
         }
      }
      else
      {
         instance = new SharedNioEventLoopGroup(numThreads, new HornetQThreadFactory("HornetQ-client-netty-threads", true, getThisClassLoader()));
      }
      instance.nioChannelFactoryCount.incrementAndGet();
      return instance;
   }

   @Override
   public Future terminationFuture()
   {
      return terminationPromise;
   }

   @Override
   public Future shutdownGracefully()
   {
      return shutdownGracefully(100, 3000, TimeUnit.MILLISECONDS);
   }

   @Override
   public Future shutdownGracefully(final long l, final long l2, final TimeUnit timeUnit)
   {
      if (nioChannelFactoryCount.decrementAndGet() == 0)
      {
         shutdown.compareAndSet(null, next().scheduleAtFixedRate(new Runnable()
         {
            @Override
            public void run()
            {
               synchronized (SharedNioEventLoopGroup.class)
               {
                  if (shutdown.get() != null)
                  {
                     Future future = SharedNioEventLoopGroup.super.shutdownGracefully(l, l2, timeUnit);
                     future.addListener(new FutureListener