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Several applications would like to use event-notification to coordinate their actions, and would like to use Messaging to communicate those events.

How can messaging be used to transmit events from one application to another?

Use an Event Message for reliable, asynchronous event notification between applications.

When a subject has an event to announce, it will create an event object, wrap it in a message, and send it on a channel. The observer will receive the event message, get the event, and process it. Messaging does not change the event notification, just makes sure that the notification gets to the observer.

Related patterns:

Find the full description of this pattern in: Enterprise Integration Patterns Gregor Hohpe and Bobby Woolf ISBN 0321200683 650 pages Addison-Wesley

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