7.2. Event Message

Camel supports the Event Message from the Introducing Enterprise Integration Patterns by supporting the Message Exchange Pattern on a Message which can be set to InOnly to indicate a oneway event message. Camel Components then implement this pattern using the underlying transport or protocols.

The default behaviour of many Components is InOnly such as for JMS, File or SEDA

If you are using a component which defaults to InOut you can override the Message Exchange Pattern for an endpoint using the pattern property.

foo:bar?exchangePattern=InOnly

From 2.0 onwards on Camel you can specify the Message Exchange Pattern using the dsl.

Using the Fluent Builders

from("mq:someQueue").
  inOnly().
  bean(Foo.class);

or you can invoke an endpoint with an explicit pattern

from("mq:someQueue").
  inOnly("mq:anotherQueue");

Using the Spring XML Extensions

<route>
    <from uri="mq:someQueue"/>
    <inOnly uri="bean:foo"/>
</route>

<route>
    <from uri="mq:someQueue"/>
    <inOnly uri="mq:anotherQueue"/>
</route>