DispatcherImpl 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
    19  package org.codehaus.activemq.service.impl;
    20
    21  import EDU.oswego.cs.dl.util.concurrent.SynchronizedBoolean;
    22  import org.codehaus.activemq.broker.BrokerClient;
    23  import org.codehaus.activemq.service.Dispatcher;
    24  import org.codehaus.activemq.service.MessageContainerManager;
    25  import org.codehaus.activemq.service.Subscription;
    26
    27  /***
    28   * A dispatcher of messages to some JMS connection.
    29   * <p/>
    30   * Typically this uses either IO or NIO to shovel the messages down
    31   * a socket as fast as possible - in either a push or pull way.
    32   *
    33   * @version $Revision: 1.2 $
    34   */
    35  public class DispatcherImpl implements Dispatcher {
    36
    37      private SynchronizedBoolean started = new SynchronizedBoolean(false);
    38      private DispatchWorker worker = new DispatchWorker(); //this should be pooled
    39      private MessageContainerManager containerManager;
    40      private Thread runner;
    41
    42
    43      /***
    44       * Register the MessageContainerManager for the Dispatcher
    45       *
    46       * @param mcm
    47       */
    48      public void register(MessageContainerManager mcm) {
    49          this.containerManager = mcm;
    50          worker.register(mcm);
    51      }
    52
    53      /***
    54       * Called to indicate that there is work to do on a Subscription this will wake up a Dispatch Worker if it is
    55       * waiting for messages to dispatch
    56       *
    57       * @param sub the Subscription that now has messages to dispatch
    58       */
    59      public void wakeup(Subscription sub) {
    60          worker.wakeup();
    61      }
    62
    63      /***
    64       * Called to indicate that there is work to do this will wake up a Dispatch Worker if it is
    65       * waiting for messages to dispatch
    66       */
    67      public void wakeup() {
    68          worker.wakeup();
    69      }
    70
    71      /***
    72       * Add an active subscription
    73       *
    74       * @param client
    75       * @param sub
    76       */
    77      public void addActiveSubscription(BrokerClient client, Subscription sub) {
    78          worker.addActiveSubscription(client, sub);
    79      }
    80
    81      /***
    82       * remove an active subscription
    83       *
    84       * @param client
    85       * @param sub
    86       */
    87      public void removeActiveSubscription(BrokerClient client, Subscription sub) {
    88          worker.removeActiveSubscription(client, sub);
    89      }
    90
    91      /***
    92       * start the DispatchWorker
    93       *
    94       * @see org.codehaus.activemq.service.Service#start()
    95       */
    96      public void start() {
    97          if (started.commit(false, true)) {
    98              worker.start();
    99              runner = new Thread(worker, "Dispatch Worker");
    100             runner.setDaemon(true);
    101             runner.setPriority(Thread.NORM_PRIORITY + 1);
    102             runner.start();
    103         }
    104     }
    105
    106     /***
    107      * stop the DispatchWorker
    108      *
    109      * @see org.codehaus.activemq.service.Service#stop()
    110      */
    111     public void stop() {
    112         worker.stop();
    113         started.set(false);
    114     }
    115 }