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From "Hadrian Zbarcea (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CAMEL-325) support a loop operation in the routing DSL
Date Wed, 24 Sep 2008 17:11:52 GMT

    [ https://issues.apache.org/activemq/browse/CAMEL-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45968#action_45968
] 

Hadrian Zbarcea commented on CAMEL-325:
---------------------------------------

The issue is not yet closed because the documentation is not done, so look for that.

In brief this feature is mostly using for testing/debugging (as the jira states).  So the
number of iterations is passed either as an int value as an argument to loop(int), or as an
expression.  The expression *must* evaluate to an *int*, not a bool, which determines the
iteration count (e.g. you could send the iteration count in a header).  The test case should
be self explanatory for now.

Keep in mind that the preconditions for the loop remain unchanged, that is the exchange for
iteration n, would be the same as for iteration 0, but through the course of an iteration
one may decide to do different things.  I think it would be useful to add one or two properties
on the exchange with the iteration index/count.

I hope this helps and thanks for the feedback!

> support a loop operation in the routing DSL
> -------------------------------------------
>
>                 Key: CAMEL-325
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-325
>             Project: Apache Camel
>          Issue Type: New Feature
>          Components: camel-core
>            Reporter: James Strachan
>            Assignee: Hadrian Zbarcea
>             Fix For: 1.5.0
>
>
> It'd be nice to do something like
> {code}
> from("file://foo").
>   loop(100).
>   to("blah");
> {code}
> Or use some kinda expression
> {code}
> from("file://foo").
>   loop().xpath("/something = 'abc').
>   to("blah");
> {code}
> To essentially add a loop inside a route. Testing is the main use case for this really.
e.g. take a few production messages and generate zillions of test case messages
> {code}
> from("file://foo").
>   loop(100).
>   bean(MyRandomizerTransform.class).
>   to("blah");
> {code}

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