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;
020
021 import org.activemq.message.ActiveMQDestination;
022
023 import javax.jms.Destination;
024 import javax.jms.InvalidDestinationException;
025 import javax.jms.JMSException;
026 import javax.jms.Message;
027 import javax.jms.MessageFormatException;
028 import javax.jms.Session;
029 import javax.jms.Topic;
030 import javax.jms.TopicPublisher;
031 import javax.jms.TopicSession;
032
033 /**
034 * A client uses a <CODE>TopicPublisher</CODE> object to publish messages on
035 * a topic. A <CODE>TopicPublisher</CODE> object is the publish-subscribe
036 * form of a message producer.
037 * <p/>
038 * <P>
039 * Normally, the <CODE>Topic</CODE> is specified when a <CODE>TopicPublisher
040 * </CODE> is created. In this case, an attempt to use the <CODE>publish
041 * </CODE> methods for an unidentified <CODE>TopicPublisher</CODE> will throw
042 * a <CODE>java.lang.UnsupportedOperationException</CODE>.
043 * <p/>
044 * <P>
045 * If the <CODE>TopicPublisher</CODE> is created with an unidentified <CODE>
046 * Topic</CODE>, an attempt to use the <CODE>publish</CODE> methods that
047 * assume that the <CODE>Topic</CODE> has been identified will throw a <CODE>
048 * java.lang.UnsupportedOperationException</CODE>.
049 * <p/>
050 * <P>
051 * During the execution of its <CODE>publish</CODE> method, a message must
052 * not be changed by other threads within the client. If the message is
053 * modified, the result of the <CODE>publish</CODE> is undefined.
054 * <p/>
055 * <P>
056 * After publishing a message, a client may retain and modify it without
057 * affecting the message that has been published. The same message object may
058 * be published multiple times.
059 * <p/>
060 * <P>
061 * The following message headers are set as part of publishing a message:
062 * <code>JMSDestination</code>,<code>JMSDeliveryMode</code>,<code>JMSExpiration</code>,
063 * <code>JMSPriority</code>,<code>JMSMessageID</code> and <code>JMSTimeStamp</code>.
064 * When the message is published, the values of these headers are ignored.
065 * After completion of the <CODE>publish</CODE>, the headers hold the values
066 * specified by the method publishing the message. It is possible for the
067 * <CODE>publish</CODE> method not to set <code>JMSMessageID</code> and
068 * <code>JMSTimeStamp</code> if the setting of these headers is explicitly
069 * disabled by the <code>MessageProducer.setDisableMessageID</code> or <code>MessageProducer.setDisableMessageTimestamp</code>
070 * method.
071 * <p/>
072 * <P>
073 * Creating a <CODE>MessageProducer</CODE> provides the same features as
074 * creating a <CODE>TopicPublisher</CODE>. A <CODE>MessageProducer</CODE>
075 * object is recommended when creating new code. The <CODE>TopicPublisher
076 * </CODE> is provided to support existing code.
077 * <p/>
078 * <p/>
079 * <P>
080 * Because <CODE>TopicPublisher</CODE> inherits from <CODE>MessageProducer
081 * </CODE>, it inherits the <CODE>send</CODE> methods that are a part of the
082 * <CODE>MessageProducer</CODE> interface. Using the <CODE>send</CODE>
083 * methods will have the same effect as using the <CODE>publish</CODE>
084 * methods: they are functionally the same.
085 *
086 * @see Session#createProducer(Destination)
087 * @see TopicSession#createPublisher(Topic)
088 */
089
090 public class ActiveMQTopicPublisher extends ActiveMQMessageProducer implements
091 TopicPublisher {
092
093 protected ActiveMQTopicPublisher(ActiveMQSession session,
094 ActiveMQDestination destination) throws JMSException {
095 super(session, destination);
096 }
097
098 /**
099 * Gets the topic associated with this <CODE>TopicPublisher</CODE>.
100 *
101 * @return this publisher's topic
102 * @throws JMSException if the JMS provider fails to get the topic for this
103 * <CODE>TopicPublisher</CODE> due to some internal error.
104 */
105
106 public Topic getTopic() throws JMSException {
107 return (Topic) super.getDestination();
108 }
109
110 /**
111 * Publishes a message to the topic. Uses the <CODE>TopicPublisher</CODE>'s
112 * default delivery mode, priority, and time to live.
113 *
114 * @param message the message to publish
115 * @throws JMSException if the JMS provider fails to publish the message due to
116 * some internal error.
117 * @throws MessageFormatException if an invalid message is specified.
118 * @throws InvalidDestinationException if a client uses this method with a <CODE>TopicPublisher
119 * </CODE> with an invalid topic.
120 * @throws java.lang.UnsupportedOperationException
121 * if a client uses this method with a <CODE>TopicPublisher
122 * </CODE> that did not specify a topic at creation time.
123 * @see javax.jms.MessageProducer#getDeliveryMode()
124 * @see javax.jms.MessageProducer#getTimeToLive()
125 * @see javax.jms.MessageProducer#getPriority()
126 */
127
128 public void publish(Message message) throws JMSException {
129 super.send(message);
130 }
131
132 /**
133 * Publishes a message to the topic, specifying delivery mode, priority,
134 * and time to live.
135 *
136 * @param message the message to publish
137 * @param deliveryMode the delivery mode to use
138 * @param priority the priority for this message
139 * @param timeToLive the message's lifetime (in milliseconds)
140 * @throws JMSException if the JMS provider fails to publish the message due to
141 * some internal error.
142 * @throws MessageFormatException if an invalid message is specified.
143 * @throws InvalidDestinationException if a client uses this method with a <CODE>TopicPublisher
144 * </CODE> with an invalid topic.
145 * @throws java.lang.UnsupportedOperationException
146 * if a client uses this method with a <CODE>TopicPublisher
147 * </CODE> that did not specify a topic at creation time.
148 */
149
150 public void publish(Message message, int deliveryMode, int priority,
151 long timeToLive) throws JMSException {
152 super.send(message, deliveryMode, priority, timeToLive);
153 }
154
155 /**
156 * Publishes a message to a topic for an unidentified message producer.
157 * Uses the <CODE>TopicPublisher</CODE>'s default delivery mode,
158 * priority, and time to live.
159 * <p/>
160 * <P>
161 * Typically, a message producer is assigned a topic at creation time;
162 * however, the JMS API also supports unidentified message producers, which
163 * require that the topic be supplied every time a message is published.
164 *
165 * @param topic the topic to publish this message to
166 * @param message the message to publish
167 * @throws JMSException if the JMS provider fails to publish the message due to
168 * some internal error.
169 * @throws MessageFormatException if an invalid message is specified.
170 * @throws InvalidDestinationException if a client uses this method with an invalid topic.
171 * @see javax.jms.MessageProducer#getDeliveryMode()
172 * @see javax.jms.MessageProducer#getTimeToLive()
173 * @see javax.jms.MessageProducer#getPriority()
174 */
175
176 public void publish(Topic topic, Message message) throws JMSException {
177 super.send(topic, message);
178 }
179
180 /**
181 * Publishes a message to a topic for an unidentified message producer,
182 * specifying delivery mode, priority and time to live.
183 * <p/>
184 * <P>
185 * Typically, a message producer is assigned a topic at creation time;
186 * however, the JMS API also supports unidentified message producers, which
187 * require that the topic be supplied every time a message is published.
188 *
189 * @param topic the topic to publish this message to
190 * @param message the message to publish
191 * @param deliveryMode the delivery mode to use
192 * @param priority the priority for this message
193 * @param timeToLive the message's lifetime (in milliseconds)
194 * @throws JMSException if the JMS provider fails to publish the message due to
195 * some internal error.
196 * @throws MessageFormatException if an invalid message is specified.
197 * @throws InvalidDestinationException if a client uses this method with an invalid topic.
198 */
199
200 public void publish(Topic topic, Message message, int deliveryMode,
201 int priority, long timeToLive) throws JMSException {
202 super.send(topic, message, deliveryMode, priority, timeToLive);
203 }
204 }