May 2009
Intermediate to advanced
330 pages
10h 34m
English
Content preview from Java Message Service, 2nd Edition
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Real-World Scenarios
Until now, our discussion of enterprise messaging has been somewhat abstract. This section attempts to give some real-world scenarios to provide you with a better idea of the types of problems that enterprise messaging systems can solve.
Figure 1-7. JMS publish-and-subscribe API core interfaces
Service-Oriented Architecture
Service-Oriented Architecture (SOA) describes an architecture style that defines business services that are abstracted from the corresponding enterprise service implementations. SOA has given rise to a new breed of middleware known as an Enterprise Service Bus, or ESB. In the early days of SOA, most ESBs were implemented as message brokers, whereby components within the messaging layer were used to perform some sort of intelligent routing or message transformation before delivering the message. These earlier message brokers have evolved into sophisticated commercial and open source ESB products that use messaging at their core. Although some ESB products support a traditional non-JMS HTTP transport, most enterprise-wide production implementations still leverage messaging as the protocol for communication.
Messaging is an excellent means of building the abstraction layer within SOA needed to fully abstract a business service from its underlying implementation. Through messaging, the business service does not need to be concerned about where the ...
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