org.hornetq.utils.ReferenceCounterUtil 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.
 */
package org.hornetq.utils;

import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author Clebert Suconic
 */

public class ReferenceCounterUtil implements ReferenceCounter
{
   private final Runnable runnable;

   /** If executor is null the runnable will be called within the same thread, otherwise the executor will be used */
   private final Executor executor;

   private final AtomicInteger uses = new AtomicInteger(0);


   public ReferenceCounterUtil(Runnable runnable)
   {
      this(runnable, null);
   }

   public ReferenceCounterUtil(Runnable runnable, Executor executor)
   {
      this.runnable = runnable;
      this.executor = executor;
   }

   @Override
   public int increment()
   {
      return uses.incrementAndGet();
   }

   @Override
   public int decrement()
   {
      int value = uses.decrementAndGet();
      if (value == 0)
      {
         if (executor != null)
         {
            executor.execute(runnable);
         }
         else
         {
            runnable.run();
         }
      }

      return value;
   }
}