Page History

...

        <route>
            <from uri="direct:start"/>
            <multicast stopOnException="true">
                <to uri="direct:foo"/>
                <to uri="direct:bar"/>
                <to uri="direct:baz"/>
            </multicast>
            <to uri="mock:result"/>
        </route>

        <route>
            <from uri="direct:foo"/>
            <to uri="mock:foo"/>
        </route>

        <route>
            <from uri="direct:bar"/>
            <process ref="myProcessor"/>
            <to uri="mock:bar"/>
        </route>

        <route>
            <from uri="direct:baz"/>
            <to uri="mock:baz"/>
        </route>

Using onPrepare to execute custom logic

Available as of Camel 2.8

The Multicast will copy the source Exchange and multicast each copy. However the copy is a shallow copy, so in case you have mutateable message bodies, then any changes will be visible by the other copied messages. If you want to use a deep clone copy then you need to use a custom onPrepare which allows you to do this using the Processor interface.

For example if you have a mutable message body as this Animal class:

{snippet:id=e1|lang=java|title=Animal|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/Animal.java}

Then we can create a deep clone processor which clones the message body:

{snippet:id=e1|lang=java|title=AnimalDeepClonePrepare|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/AnimalDeepClonePrepare.java}

Then we can use the AnimalDeepClonePrepare class in the Multicast route using the onPrepare option as shown:

{snippet:id=e1|lang=java|title=Multicast using onPrepare|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/MulticastOnPrepareTest.java}

Notice the onPrepare option is also available on other EIPs such as Splitter and Recipient List.