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From "William Tam (JIRA)" <>
Subject [jira] Updated: (CAMEL-766) Create header filter strategy that can be easily extended
Date Mon, 04 Aug 2008 05:08:52 GMT


William Tam updated CAMEL-766:

    Attachment: headerfilterstrategy_aware.patch

headerflterstrategy_aware_patch achieves the following: 1) create a new interface "HeaderFilterStrategyAware"
which can identify components that should support header filter strategy.  2) Remove getters/setters
of the strategy from (Default)Endpoint and (Default)Component.   Endpoint and Component interfaces
are not aware of the strategy.

> Create header filter strategy that can be easily extended
> ---------------------------------------------------------
>                 Key: CAMEL-766
>                 URL:
>             Project: Apache Camel
>          Issue Type: Improvement
>          Components: camel-core, camel-cxf, camel-http, camel-jetty, camel-jhc
>    Affects Versions: 1.4.0
>            Reporter: William Tam
>            Assignee: Willem Jiang
>            Priority: Minor
>             Fix For: 1.5.0
>         Attachments: headerfilterstrategy_aware.patch, javadoc_fixup.txt, patch.txt
> We have explored some ideas of how one may retreive protocol headers from of a Camel
message in this thread:
 In summary, there were two train of thoughts: 1) set aside a place for "ProtocolHeaders"
in Camel message which is strictly for storing what a component recognizes as protocol headers.
 A component can still select some or all of these protocol headers to be copied to/from the
native message header.  2) Using the current headers in Camel message and let people configure
what should be copied to/form native message.
> I thought about both approaches a bit.  I went with the later and created a patch.  I
guess the problem with the first approach is it introduces one more place to look for headers.
  We may end up forcing components examine both places for processing information.  
> In my patch, I create a HeaderFilterStrategy that can control what to copy in/out Camel
message headers.  A component can be injected with a strategy by Spring or using APIs.  I
modified the following components to use this strategy: jms, cxf, http, jetty, and jhc.  Please
review my patch and will update other components based on feedbacks.

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