content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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.apache.activemq.thread;
  
  import java.util.concurrent.Executor;
  
  /**
   * 
   */
  public class DeterministicTaskRunner implements TaskRunner {
  
      private final Executor executor;
      private final Task task;
      private final Runnable runable;
      private boolean shutdown;    
      
      /**Constructor
       * @param executor
       * @param task
       */
      public DeterministicTaskRunner(Executor executor, Task task) {
          this.executor = executor;
          this.task = task;
          this.runable = new Runnable() {
              public void run() {
                  Thread.currentThread();
                  runTask();
              }
          };
      }
  
      /**
       * We Expect MANY wakeup calls on the same TaskRunner - but each
       * needs to run
       */
      public void wakeup() throws InterruptedException {
          synchronized (runable) {
  
              if (shutdown) {
                  return;
              }
              executor.execute(runable);
  
          }
      }
  
      /**
       * shut down the task
       * 
       * @throws InterruptedException
       */
      public void shutdown(long timeout) throws InterruptedException {
          synchronized (runable) {
              shutdown = true;
          }
      }
  
      public void shutdown() throws InterruptedException {
          shutdown(0);
      }
  
      final void runTask() {
  
          synchronized (runable) {
              if (shutdown) {
                  runable.notifyAll();
                  return;
              }
          }
          task.iterate();
      }
  }
  