Pattern Catalog
| Publish-Subscribe Channel |
Pattern Catalog | |
| Site Home • Patterns Home • Table of Contents |
An application is using Messaging to announce events.
How can the sender broadcast an event to all interested receivers?
Send the event on a Publish-Subscribe Channel, which delivers a copy of a particular event to each receiver.
A Publish-Subscribe Channel works like this: It has one input channel that splits into multiple output channels, one for each subscriber. When an event is published into the channel, the Publish-Subscribe Channel delivers a copy of the message to each of the output channels. Each output channel has only one subscriber, which is only allowed to consume a message once. In this way, each subscriber only gets the message once and consumed copies disappear from their channels.
...Related patterns: Durable Subscriber, Event Message, Message, Message Channel, Message Store, Messaging, JMS Publish/Subscribe Example, Point-to-Point Channel, Request-Reply
For a full description of the pattern see:
 | Enterprise Integration Patterns
Gregor Hohpe and Bobby Woolf ISBN 0321200683 650 pages Addison-Wesley |
| Home • Patterns • Table of Contents |  Previous Next  |
 | © 2003 • Bobby Woolf • All rights reserved. |