webMethods 10.2 | Service Development Help | Working with JMS Triggers | Creating a JMS Trigger | Adding JMS Destinations and Message Selectors to a JMS Trigger | Creating a Message Selector
 
Creating a Message Selector
If you want the JMS trigger to receive a subset of messages from a specified destination, create a message selector. A message selector is an expression that specifies the criteria for the messages in which the JMS trigger is interested.
The JMS provider applies the message selector to messages it receives. If the selector evaluates to true, the message is sent to the JMS trigger. If the selector evaluates to false, the message is not sent to the JMS trigger.
By creating message selectors, you can delegate some filtering work to the JMS provider. This can preserve Integration Server resources that otherwise would have been spent receiving and processing unwanted messages.
The message selector must use the message selector syntax specified in the Java Message Service standard. The message selector can reference header and property fields in the JMS message only.
Note: If you want to filter on the contents of the JMS message body, write a local filter. Integration Server evaluates a local filter after the JMS trigger receives the message from the JMS provider. Only standard JMS triggers can use local filters.
Creating a JMS Trigger
Adding JMS Destinations and Message Selectors to a JMS Trigger
Creating a Local Filter
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