001 /**
002 *
003 * Copyright 2004 Protique Ltd
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 *
017 **/
018
019 package org.activemq.service.impl;
020
021 import EDU.oswego.cs.dl.util.concurrent.SynchronizedBoolean;
022 import org.activemq.broker.BrokerClient;
023 import org.activemq.service.Dispatcher;
024 import org.activemq.service.MessageContainerManager;
025 import org.activemq.service.Subscription;
026
027 /**
028 * A dispatcher of messages to some JMS connection.
029 * <p/>
030 * Typically this uses either IO or NIO to shovel the messages down
031 * a socket as fast as possible - in either a push or pull way.
032 *
033 * @version $Revision: 1.1.1.1 $
034 */
035 public class DispatcherImpl implements Dispatcher {
036
037 private SynchronizedBoolean started = new SynchronizedBoolean(false);
038 private DispatchWorker worker = new DispatchWorker(); //this should be pooled
039 private Thread runner;
040
041
042 /**
043 * Register the MessageContainerManager for the Dispatcher
044 *
045 * @param mcm
046 */
047 public void register(MessageContainerManager mcm) {
048 worker.register(mcm);
049 }
050
051 /**
052 * Called to indicate that there is work to do on a Subscription this will wake up a Dispatch Worker if it is
053 * waiting for messages to dispatch
054 *
055 * @param sub the Subscription that now has messages to dispatch
056 */
057 public void wakeup(Subscription sub) {
058 worker.wakeup();
059 }
060
061 /**
062 * Called to indicate that there is work to do this will wake up a Dispatch Worker if it is
063 * waiting for messages to dispatch
064 */
065 public void wakeup() {
066 worker.wakeup();
067 }
068
069 /**
070 * Add an active subscription
071 *
072 * @param client
073 * @param sub
074 */
075 public void addActiveSubscription(BrokerClient client, Subscription sub) {
076 worker.addActiveSubscription(client, sub);
077 }
078
079 /**
080 * remove an active subscription
081 *
082 * @param client
083 * @param sub
084 */
085 public void removeActiveSubscription(BrokerClient client, Subscription sub) {
086 worker.removeActiveSubscription(client, sub);
087 }
088
089 /**
090 * start the DispatchWorker
091 *
092 * @see org.activemq.service.Service#start()
093 */
094 public void start() {
095 if (started.commit(false, true)) {
096 worker.start();
097 runner = new Thread(worker, "Dispatch Worker");
098 runner.setDaemon(true);
099 runner.setPriority(Thread.NORM_PRIORITY + 1);
100 runner.start();
101 }
102 }
103
104 /**
105 * stop the DispatchWorker
106 *
107 * @see org.activemq.service.Service#stop()
108 */
109 public void stop() {
110 worker.stop();
111 started.set(false);
112 }
113 }