6.2. Event Message

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本文介绍如何在Apache Camel中使用InOnly交换模式来发送一次性事件消息。默认情况下，许多组件如JMS、文件和SEDA都采用InOnly模式进行处理。此外，文章还详细介绍了如何通过不同的配置方式明确指定InOnly模式。

Event Message

Camel supports the Event Message from the Introducing Enterprise Integration 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.
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The default behaviour of many Components is InOnly such as for JMS, File or SEDA

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

From 2.0 onwards on Camel you can specify the 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>