6.2. Event Message

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. 
这里写图片描述 
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>
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