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https://issues.apache.org/jira/browse/CAMEL-26719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18140369#comment-18140369
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Claus Ibsen commented on CAMEL-26719:
-------------------------------------
PR: https://github.com/apache/camel/pull/29389 (stacked on #29388, #29387 and
#29386).
_Claude Code on behalf of Claus Ibsen_
> camel-chaos - when= fires a rule only for the messages that meet a condition
> ----------------------------------------------------------------------------
>
> Key: CAMEL-26719
> URL: https://issues.apache.org/jira/browse/CAMEL-26719
> Project: Camel
> Issue Type: Improvement
> Components: camel-jbang
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Major
> Fix For: 4.24.0
>
>
> Step 4 of the stage 2 order decided on CAMEL-26607 (S2-3): a condition on the
> message.
> * {{endpoint=http:stock* error status=503 when="${header.country} == 'ES'"}}.
> The simple language only, in quotes. A {{<language>:}} prefix is reserved for
> later, and refused for now. The "or" of the prompt on CAMEL-26330 stays two
> rules.
> * The predicate is built once, when the rule is added (the simple language of
> the context), and checked in the hooks before the rate: {{matches}}, {{rate}}
> and {{until=<count>}} count only the messages that meet the condition, and a
> seed gives the same faults for the same matching messages.
> * Not with {{at=poll}}, {{stall}} or {{lifecycle}}: there is no message.
> Without {{at=}}, a rule with {{when=}} leaves out the polls of its target.
> * Reading a stream body consumes it: the stream cache is reset after the
> check, a stream body that is not cached yet (such as a reply) is cached
> first, and a condition on the body is refused when stream caching is off.
> * A predicate that throws counts as not matched, and shows in
> {{skippedReasons}}; it does not fail the exchange.
> * The rule in plain words says it; the chaos model gets the option; the chaos
> screen keeps it out of the fault column.
> _Claude Code on behalf of Claus Ibsen_
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