Receiving messages

 

All the time JMS Postcard is running, it polls a queue called postcard for incoming messages from other Postcard applications. If there is no queue called postcard, JMS Postcard creates one.

When JMS Postcard starts running, it creates a Java Message Service QueueReceiver object for the local postcard queue, providing as a parameter a selector string that filters the messages to be received from the queue by the Correlation Identifier (CorrelId field). The selector string defines that the postcard client should only receive messages where the CorrelId field matches the nickname of the user. The words from the message data are then presented in the JMS Postcard window.

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