ExecutorHelper xref

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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  }