May 2009
Intermediate to advanced
330 pages
10h 34m
English
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Enterprise Messaging
Enterprise messaging is not a new concept. Messaging products such as IBM WebSphere MQ, SonicMQ, Microsoft Message Queuing (MSMQ), and TIBCO Rendezvous have been in existence for many years. Recently, several open source messaging products such as ActiveMQ have entered the market and are being used in enterprise production environments. Also, the introduction of Service-Oriented Architecture (SOA) has given rise to a new type of messaging product known as an Enterprise Service Bus (ESB). Although most ESBs allow for HTTP-based communications, messaging-based communication continues to remain the standard in most production enterprise systems.
A key concept of enterprise messaging is that messages are delivered asynchronously from one system to others over a network. To deliver a message asynchronously means the sender is not required to wait for the message to be received or handled by the recipient; it is free to send the message and continue processing. Asynchronous messages are treated as autonomous units—each message is self-contained and carries all of the data and state needed by the business logic that processes it.
In asynchronous messaging, applications use a simple API to construct a message, then hand it off to the Message-Oriented Middleware for delivery to one or more intended recipients (see Figure 1-1). A message is a package of business data that is sent from one application to another over the network. The message should be self-describing in ...
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