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D.5 Declaring a Message Selector Java Message Service When a consumer is created with a message selector, the JMS provider must validate that the selector statement is syntactically correct. If the selector is not correct, the operation throws a javax.jms.InvalidSelectorException. Here are the session methods used to specify a message selector when creating a consumer: // P2P Session's Message Consumer Methods public QueueSession extends Session{ QueueBrowser createBrowser(Queue queue, String messageSelector) throws JMSException, InvalidSelectorException, InvalidDestinationException; QueueReciever createReceiver(Queue queue, String messageSelector) throws JMSException, InvalidSelectorException, InvalidDestinationException; ... } The QueueBrowser and QueueReceiver types of the QueueSession interface are explored in Chapter 5. The durable subscriber (shown here) is covered in Chapter 4: // Pub/Sub Session's Message Consumer Methods public TopicSession extends Session { TopicSubscriber createSubscriber(Topic topic, String messageSelector, boolean noLocal) throws JMSException, InvalidSelectorException, InvalidDestinationException; } TopicSubscriber createDurableSubscriber(Queue queue, String name, String messageSelector, boolean noLocal) throws JMSException, InvalidSelectorException, InvalidDestinationException; ... The message selector used for a consumer can always be obtained by calling the getMessageSelector( ) method on a QueueReceiver, QueueBrowser, or TopicSubscriber. The getMessageSelector( ) method returns the message selector for that consumer as a String. Once a consumer's message selector has been established, it cannot be changed. The consumer must be closed or deleted (durable subscriber) and a new consumer created with a new message selector. 178
D.6 Not Delivered Semantics Java Message Service What happens to messages that are not selected for delivery to the consumer by its message selector? This depends on the message model used. For the publish-and-subscribe model, the messages are not delivered to that consumer; they are, however, delivered to other pub/sub consumers. This is true for both nondurable and durable subscriptions. For the p2p model, any messages that are not selected by the consumer are not visible to that consumer. They are, however, visible to other p2p consumers. 179
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Java Message Service Richard Monson
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Chapter 7. Deployment Consideration
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Java Message Service Although this
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Java Message Service Examples devel
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Java Message Service Chapter 1. Und
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Java Message Service Before we disc
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Java Message Service to naming and
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1.3.1 Enterprise Application Integr
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Java Message Service Figure 1.5. Dy
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Java Message Service With J2EE, JSP
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Java Message Service recognition of
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TopicConnectionFactory conFactory =
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Java Message Service Before examini
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Understanding JNDI Java Message Ser
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Java Message Service The TopicConne
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protected void writeMessage(String
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Java Message Service When the Topic
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Java Message Service publishing a m
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Java Message Service Messages come
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3.1.1.3 JMSMessageID Java Message S
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3.2 Properties Java Message Service
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Java Message Service The following
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Notification of certain bids on inv
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Java Message Service When a consume
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UTF-8 Java Message Service UTF-8 en
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Java Message Service Table 3.1 show
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Java Message Service Essentially, M
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3.4.9 Interoperability and Portabil
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4.1.1 Running the B2B Application J
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jne.printStackTrace( ); System.exit
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try { Properties env = new Properti
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Java Message Service Once the Retai
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Java Message Service We can demonst
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Java Message Service publish( ) met
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Java Message Service The receive( )
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4.7 Unsubscribing Java Message Serv
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Java Message Service multiple consu
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import javax.jms.TopicConnectionFac
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} } try { System.out.println("\nRet
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TopicConnectionFactory tFactory = n
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public QWholesaler(String broker, S
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Java Message Service have already p
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} if (message != null){ int orderQt
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Java Message Service Chapter 6. Gua
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6.2.1 AUTO_ACKNOWLEDGE Java Message
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Java Message Service via publish-an
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Java Message Service message. If th
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Java Message Service QWholesaler an
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Java Message Service avoids process
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Figure 6.8. Transactional messages
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Java Message Service uses a JMS tra
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} return; session.commit(); } else
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Else, commit (that's what just happ
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XAResource jmsXA = session.getXARes
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... } { try { Thread.sleep(10000);
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Chapter 7. Deployment Consideration
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Java Message Service A vendor may h
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Java Message Service that your memo
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Java Message Service only really vi
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7.2.5 The Bottom Line Java Message
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Java Message Service There are two
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Java Message Service Figure 7.2. Us
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Chapter 8. J2EE, EJB, and JMS 8.1 J
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Java Message Service JNDI ENC. In a
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8.3 The JMS Resource in J2EE Java M
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Page 178 and 179: Appendix D. Message Selectors Java
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