[jira] [Commented] (CAMEL-6543) provide a way to expose common header names, types and payload types for endpoints

["Claus Ibsen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CAMEL-6543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17599321#comment-17599321 ] 

Claus Ibsen commented on CAMEL-6543:
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We have implemented header-names

> 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: New Feature
>            Reporter: James Strachan
>            Priority: Major
>             Fix For: 3.x
>
>
> 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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