Beginning Java EE 6 with GlassFish 3, Second Edition

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CHAPTER 13 ■ SENDING MESSAGESqueue, and no other consumer can receive it. In Figure 13-4, you can see one sender producing threemessages.Figure 13-4. Multiple receiversNote that P2P doesn’t guarantee messages are delivered in any particular order (the order is notdefined). A provider might pick them in arrival order, or randomly, or some other way.Publish-SubscribeIn the pub-sub model, a single message is sent by a single producer to potentially several consumers.The model is built around the concept of topics, publishers, and subscribers (Figure 13-5). Consumersare called subscribers because they first need to subscribe to a topic. The provider manages thesubscribing/unsubscribing mechanism as it occurs dynamically.Figure 13-5. Pub-sub modelThe topic retains messages until they are distributed to all subscribers. Unlike the P2P model, thereis a timing dependency between publishers and subscribers; subscribers do not receive messages sentprior to their subscription, and, if the subscriber is inactive for a specified period, it will not receive pastmessages when it becomes active again. Note that this can be avoided, because the JMS API supports theconcept of a durable subscriber, as you’ll later see.Multiple subscribers can consume the same message. The pub-sub model can be used forbroadcast-type applications, in which a single message is delivered to several consumers. In Figure 13-6,the publisher sends three messages that each subscriber will receive (in an undefined order).384
CHAPTER 13 ■ SENDING MESSAGESFigure 13-6. Multiple subscribersJMS APIThe JMS API is located under the javax.jms package and provides classes and interfaces for applicationsthat require a messaging system (see Figure 13-7). This API enables asynchronous communicationbetween clients by providing a connection to the provider, and a session where messages can be createdand sent or received. These messages can contain text or other different kinds of objects.Figure 13-7. JMS API (derived from Figure 2-1 of the JMS 1.1 specification)385
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The EXPERT’s VOIce ® in Java tm
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Beginning Java EE 6 Platform with G
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Contents at a Glance■Foreword ...
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■ CONTENTSSummary ...............
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■ CONTENTSBulk Update ...........
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■ CONTENTSStateful . ............
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■ CONTENTSScripting Elements ....
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■ CONTENTSMDB Model .............
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■ CONTENTSFrom the Web to Web Ser
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About the Author■ Antonio Goncalv
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AcknowledgmentsWriting a book about
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■ PREFACECONTENTSChapter 1 briefl
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C H A P T E R 1■ ■ ■Java EE 6
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CHAPTER 1 ■ JAVA EE 6 AT A GLANCE
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CHAPTER 2 ■ JAVA PERSISTENCEJPA S
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CHAPTER 2 ■ JAVA PERSISTENCEEclip
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CHAPTER 2 ■ JAVA PERSISTENCEusing
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CHAPTER 2 ■ JAVA PERSISTENCEFigur
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CHAPTER 2 ■ JAVA PERSISTENCENote
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CHAPTER 2 ■ JAVA PERSISTENCE■ N
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CHAPTER 2 ■ JAVA PERSISTENCERunni
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CHAPTER 2 ■ JAVA PERSISTENCE@Befo
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CHAPTER 2 ■ JAVA PERSISTENCERunni
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CHAPTER 3 ■ OBJECT-RELATIONAL MAP
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C H A P T E R 4■ ■ ■Managing
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CHAPTER 4 ■ MANAGING PERSISTENT O
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C H A P T E R 5■ ■ ■Callbacks
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CHAPTER 5 ■ CALLBACKS AND LISTENE
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CHAPTER 6 ■ ENTERPRISE JAVA BEANS
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C H A P T E R 7■ ■ ■Session B
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CHAPTER 7 ■ SESSION BEANS AND THE
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C H A P T E R 8■ ■ ■Callbacks
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CHAPTER 8 ■ CALLBACKS AND INTERCE
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C H A P T E R 9■ ■ ■Transacti
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CHAPTER 9 ■ TRANSACTIONS AND SECU
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CHAPTER 10 ■ JAVASERVER FACESUnde
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CHAPTER 10 ■ JAVASERVER FACESList
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CHAPTER 10 ■ JAVASERVER FACESWrit
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CHAPTER 10 ■ JAVASERVER FACESpubl
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CHAPTER 10 ■ JAVASERVER FACES•
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C H A P T E R 11■ ■ ■Pages an
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CHAPTER 11 ■ PAGES AND COMPONENTS
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CHAPTER 14 ■ SOAP WEB SERVICESapp
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CHAPTER 15 ■ RESTFUL WEB SERVICES
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■ INDEXApache Maven. See Mavenapp
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■ INDEXCD-BookStore application (
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■ INDEXDerby, 31-32installing, 32
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■ INDEXexpression language (EL),
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■ INDEXJava Archive (jar) files,
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