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6.5 Message Filter

Message Filter [EIP] is a component in an integration solution that selectively processes messages. A Java CAPS solution offers two ways in which a Message Filter can determine whether or not to process a message.

If the message source is a JMS Destination, such as a queue or a topic, the Message Filter can be configured, through the connectivity map, to only accept messages whose attributes match an SQL-like selection expression. This method leverages the JMS selector mechanism. Rather than receiving a message and, if not of interest, discarding it, the JMS selector–based Message Filter prevents delivery of messages that do not match the selector expression to the filtering receiver. This mechanism is static in that the selection expression is configured through the connectivity map and cannot be changed without redeploying the enterprise application.

Java CAPS provides the means to implement a dynamic selection solution using a Java Collaboration. This technique, discussed at length in Chapter 5, section 5.6.7, and Chapter 11, "Message Correlation," section 11.11, allows selection expression to change at runtime, thus providing the means to implement dynamic routing solutions.

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