[CONF] Apache Camel: Loop (page edited)

[confluence]

Page Edited : CAMEL : Loop Loop has been edited by Hadrian Zbarcea (Jan 21, 2009). (View changes) Content: Loop The Loop allows to process the a message a number of times and possibly process them in a different way. Useful mostly for testing. For each iteration two properties are set on the Exchange that could be used by processors down the pipeline to process the Message in different ways. Property Description CamelIterationCount Total number of iterations to be run CamelIterationIndex Index of the current iteration (0 based) that could be used by processors down the pipeline to process the Message in different ways. Examples The following example shows how to take a request from the direct:x endpoint , then send the message repetitively to mock:result. The number of times the message is sent is either passed as an argument to loop(), or determined at runtime by evaluating an _expression_. The _expression_ must evaluate to an int, otherwise a RuntimeCamelException is thrown. Using the Fluent Builders Pass loop count as an argument from("direct:a").loop(8).to("mock:result"); Use _expression_ to determine loop count from("direct:b").loop(header("loop")).to("mock:result"); Use _expression_ to determine loop count from("direct:c").loop().xpath("/hello/@times").to("mock:result"); Using the Spring XML Extensions Pass loop count as an argument <route> <from uri="direct:a"/> <loop> <constant>8</constant> <to uri="mock:result"/> </loop> </route> Use _expression_ to determine loop count <route> <from uri="direct:b"/> <loop> <header>loop</header> <to uri="mock:result"/> </loop> </route> For further examples of this pattern in use you could look at one of the junit test case Using This Pattern If you would like to use this EIP Pattern then please read the Getting Started, you may also find the Architecture useful particularly the description of Endpoint and URIs. Then you could try out some of the Examples first before trying this pattern out.

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