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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.codehaus.activemq.util;
19  
20  import EDU.oswego.cs.dl.util.concurrent.Executor;
21  import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  import org.codehaus.activemq.service.Service;
25  
26  import javax.jms.JMSException;
27  
28  /***
29   * A helper class for working with  {@link Executor} objects
30   *
31   * @version $Revision: 1.1 $
32   */
33  public class ExecutorHelper {
34      private static final Log log = LogFactory.getLog(ExecutorHelper.class);
35  
36      /***
37       * A helper method to stop the execution of an executor
38       *
39       * @param executor the executor or null if one is not created yet
40       */
41      public static void stopExecutor(Executor executor) throws InterruptedException, JMSException {
42          if (executor instanceof Service) {
43              Service service = (Service) executor;
44              service.stop();
45          }
46          else if (executor instanceof PooledExecutor) {
47              PooledExecutor pe = (PooledExecutor) executor;
48              pe.shutdownAfterProcessingCurrentlyQueuedTasks();
49              //pe.shutdownNow();
50              pe.awaitTerminationAfterShutdown();
51          }
52          else if (executor != null) {
53              log.warn("Don't know how to cleanly close down the given executor: " + executor
54                      + ". Consider deriving from this class to implement the Service interface to shut down cleanly");
55          }
56      }
57  
58  }