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In Camel 2.5 we introduced a dynamicRouter in the DSL which is like a dynamic Routing Slip which evaluates the slip on-the-fly.
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You must ensure the expression used for the dynamicRouter such as a bean, will return null to indicate the end. Otherwise the dynamicRouter will keep repeating endlessly.
Options
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Name | Default Value | Description |
|---|---|---|
| | Delimiter used if the Expression returned multiple endpoints. |
| | If an endpoint uri could not be resolved, should it be ignored. Otherwise Camel will thrown an exception stating the endpoint uri is not valid. |
| | Camel 2.13.1/2.12.4: Allows to configure the cache size for the |
Dynamic Router in Camel 2.5 onwards
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In Java DSL you can use the dynamicRouter as shown below:
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Which will leverage a Bean to compute the slip on-the-fly, which could be implemented as follows:
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Mind that this example is only for show and tell. The current implementation is not thread safe. You would have to store the state on the Exchange, to ensure thread safety, as shown below:
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You could also store state as message headers, but they are not guaranteed to be preserved during routing, where as properties on the Exchange are. Although there was a bug in the method call expression, see the warning below.
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Mind that in Camel 2.9.2 or older, when using a Bean the state is not propagated, so you will have to use a Processor instead. This is fixed in Camel 2.9.3 onwards.
Spring XML
The same example in Spring XML would be:
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@DynamicRouter annotation
You can also use the @DynamicRouter annotation, for example the Camel 2.4 example below could be written as follows. The route method would then be invoked repeatedly as the message is processed dynamically. The idea is to return the next endpoint uri where to go. Return null to indicate the end. You can return multiple endpoints if you like, just as the Routing Slip, where each endpoint is separated by a delimiter.
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Dynamic Router in Camel 2.4 or older
The simplest way to implement this is to use the RecipientList Annotation on a Bean method to determine where to route the message.
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In the above we can use the Parameter Binding Annotations to bind different parts of the Message to method parameters or use an Expression such as using XPath or XQuery.
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- POJO Producing
- Spring Remoting
- Bean component
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