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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 }