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; 20 21 import org.codehaus.activemq.message.ActiveMQDestination; 22 23 import javax.jms.Destination; 24 import javax.jms.InvalidDestinationException; 25 import javax.jms.JMSException; 26 import javax.jms.Message; 27 import javax.jms.MessageFormatException; 28 import javax.jms.Session; 29 import javax.jms.Topic; 30 import javax.jms.TopicPublisher; 31 import javax.jms.TopicSession; 32 33 /*** 34 * A client uses a <CODE>TopicPublisher</CODE> object to publish messages on 35 * a topic. A <CODE>TopicPublisher</CODE> object is the publish-subscribe 36 * form of a message producer. 37 * <p/> 38 * <P> 39 * Normally, the <CODE>Topic</CODE> is specified when a <CODE>TopicPublisher 40 * </CODE> is created. In this case, an attempt to use the <CODE>publish 41 * </CODE> methods for an unidentified <CODE>TopicPublisher</CODE> will throw 42 * a <CODE>java.lang.UnsupportedOperationException</CODE>. 43 * <p/> 44 * <P> 45 * If the <CODE>TopicPublisher</CODE> is created with an unidentified <CODE> 46 * Topic</CODE>, an attempt to use the <CODE>publish</CODE> methods that 47 * assume that the <CODE>Topic</CODE> has been identified will throw a <CODE> 48 * java.lang.UnsupportedOperationException</CODE>. 49 * <p/> 50 * <P> 51 * During the execution of its <CODE>publish</CODE> method, a message must 52 * not be changed by other threads within the client. If the message is 53 * modified, the result of the <CODE>publish</CODE> is undefined. 54 * <p/> 55 * <P> 56 * After publishing a message, a client may retain and modify it without 57 * affecting the message that has been published. The same message object may 58 * be published multiple times. 59 * <p/> 60 * <P> 61 * The following message headers are set as part of publishing a message: 62 * <code>JMSDestination</code>,<code>JMSDeliveryMode</code>,<code>JMSExpiration</code>, 63 * <code>JMSPriority</code>,<code>JMSMessageID</code> and <code>JMSTimeStamp</code>. 64 * When the message is published, the values of these headers are ignored. 65 * After completion of the <CODE>publish</CODE>, the headers hold the values 66 * specified by the method publishing the message. It is possible for the 67 * <CODE>publish</CODE> method not to set <code>JMSMessageID</code> and 68 * <code>JMSTimeStamp</code> if the setting of these headers is explicitly 69 * disabled by the <code>MessageProducer.setDisableMessageID</code> or <code>MessageProducer.setDisableMessageTimestamp</code> 70 * method. 71 * <p/> 72 * <P> 73 * Creating a <CODE>MessageProducer</CODE> provides the same features as 74 * creating a <CODE>TopicPublisher</CODE>. A <CODE>MessageProducer</CODE> 75 * object is recommended when creating new code. The <CODE>TopicPublisher 76 * </CODE> is provided to support existing code. 77 * <p/> 78 * <p/> 79 * <P> 80 * Because <CODE>TopicPublisher</CODE> inherits from <CODE>MessageProducer 81 * </CODE>, it inherits the <CODE>send</CODE> methods that are a part of the 82 * <CODE>MessageProducer</CODE> interface. Using the <CODE>send</CODE> 83 * methods will have the same effect as using the <CODE>publish</CODE> 84 * methods: they are functionally the same. 85 * 86 * @see Session#createProducer(Destination) 87 * @see TopicSession#createPublisher(Topic) 88 */ 89 90 public class ActiveMQTopicPublisher extends ActiveMQMessageProducer implements 91 TopicPublisher { 92 93 protected ActiveMQTopicPublisher(ActiveMQSession session, 94 ActiveMQDestination destination) throws JMSException { 95 super(session, destination); 96 } 97 98 /*** 99 * 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 }