In some scenarios, we would like to use a Message Router, but we need to have more flexibility and control over the routing rules that are being used. The drawback to a Message Router is that the rules are embedded statically and can’t be modified during execution. In situations where we need more control, we can utilize a Dynamic Router that allows the routing rules to be defined at startup time.
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Beyond the standard input and output channels, the Dynamic Router will also use an additional control channel. At system start-up time, all of the possible recipients will transmit a message to the control channel that is connected to the Dynamic Router. This message is designed to signify their presence and define the conditions upon which they will accept a message.
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The dynamic nature of this pattern will allow for a flexible, efficient, predictive routing model that eliminates the maintenance dependency of a message router.
Dynamic Router using XML DSL with Bean
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<route>
<from uri="direct:input"/>
<dynamicRouter>
<!-- use a method call on a bean as dynamic router -->
<method beanType="com.bean.MyRoutingBean" method="findRoute"/>
</dynamicRouter>
</route> |