Publish Subscribe Channel

Camel supports the Publish Subscribe Channel from the EIP patterns using for example the following components:

JMS for working with JMS Topics for high performance, clustering and load balancing
XMPP when using rooms for group communication
SEDA for working with SEDA in the same CamelContext which can work in pub-sub, but allowing multiple consumers.
VM as SEDA but for intra-JVM.

Samples

Another option is to explicitly list the publish-subscribe relationship in your routing logic; this keeps the producer and consumer decoupled but lets you control the fine grained routing configuration using the DSL or Xml Configuration.

In Java code:

from("direct:a")
    .multicast()
      .to("direct:b")
      .to("direct:c")
      .to("direct:d")
    .end() // end multicast

And in XML:

<camelContext xmlns="http://camel.apache.org/schema/spring">
    <route>
        <from uri="direct:a"/>
        <multicast>
            <to uri="direct:b"/>
            <to uri="direct:c"/>
            <to uri="direct:d"/>
        </multicast>
    </route>
</camelContext>