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From "Grzegorz Grzybek (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CAMEL-6543) provide a way to expose common header names, types and payload types for endpoints
Date Sat, 10 May 2014 22:16:31 GMT

     [ https://issues.apache.org/jira/browse/CAMEL-6543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Grzegorz Grzybek reassigned CAMEL-6543:
---------------------------------------

    Assignee: Grzegorz Grzybek

> provide a way to expose common header names, types and payload types for endpoints
> ----------------------------------------------------------------------------------
>
>                 Key: CAMEL-6543
>                 URL: https://issues.apache.org/jira/browse/CAMEL-6543
>             Project: Camel
>          Issue Type: Improvement
>            Reporter: james strachan
>            Assignee: Grzegorz Grzybek
>
> Given a configuration of an Endpoint, it'd be nice if there was a way for endpoints to
expose what a consumer will receive up front (at design time, before it actually runs), in
terms of headers (their name & types) and the payload type.
> Most of this is documented on the wiki in places already - its useful stuff to konw;
but there's no way to introspect an endpoint and know this (so we can, for example, visualise
the things exposed by an endpoint - or provide better validation of what can connect to what,
what will work or fail; what type conversions could be done after consuming from an endpoint,
what headers are available by default in expression languages and so forth.
> I guess other steps in a camel flow can change this data too (e.g. adding/removing headers,
changing the payload value).
> But as a start - and endpoint consumer specific plugin would be great.
> e.g. maybe we can add a new method to ComponentConfiguration which allows endpoints to
return the header/payload metadata (if its known)
> https://cwiki.apache.org/confluence/display/CAMEL/ComponentConfiguration
> We could maybe add some annotations, metadata or code which could then be introspected
by the generated endpoint documentation:
> https://cwiki.apache.org/confluence/display/CAMEL/Endpoint+Annotations
> afterall we often define constants for the header values already for a component; so
it would be easy to add an annotation and have them discovered; its mostly just being able
to find all the headers exposed by default (and which are optional I guess) on messages from
an endpoint.



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