Event Message

Camel supports the Event Message from the EIP patterns by supporting the 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

See the related Request Reply message.

Explicitly specifying InOnly

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

foo:bar?exchangePattern=InOnly

Samples

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

from("mq:someQueue").
  setExchangePattern(ExchangePattern.InOnly).
  bean(Foo.class);

or you can invoke an endpoint with an explicit pattern

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

And with XML:

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

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