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https://issues.apache.org/jira/browse/SLING-6187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15768151#comment-15768151
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Dominik Süß commented on SLING-6187:
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Do we really want the request to define the PostProcessors? in my mind
PostProcessing is an implementation detail that should not be wired to the
request.
When I was analyzing PostProcessors some years ago I always had the impression
that we would probably need to have a better registry of postprocessing
pipelines/chains and would make sure every step in the defined pipeline (e.g.
registered for a certain path or resourcetype) would need to be satisfied. So
instead of dynamically wiring postprocessors that are available by their
service ranking we would have a defined pipeline naming steps where the
postprocessors would provide the implementation for the steps and none of the
steps can be unsatisfied (or would lead to implicit failure).
> Provide a way for a POST request to assert a set of required
> SlingPostProcessors
> --------------------------------------------------------------------------------
>
> Key: SLING-6187
> URL: https://issues.apache.org/jira/browse/SLING-6187
> Project: Sling
> Issue Type: Improvement
> Components: Servlets
> Reporter: Justin Edelson
> Assignee: Justin Edelson
> Fix For: Servlets Post 2.3.16
>
> Attachments: SLING-6187-profile.diff, SLING-6187-profile.diff,
> SLING-6187-validating.diff, SLING-6187.patch
>
>
> I would like to add support for a new "special" request parameter understood
> by the Sling Post Servlet named {{:requiredPostProcessors}}. This parameter
> may contain a comma-delimited list of names (see below) which *must* be
> available *at the time the request is processed* in order for the request to
> be handled. Whether or not those processors _do_ anything or whether the
> request succeeds or not is a separate question; this is just a preflight
> check if you will.
> If any of the required SlingPostProcessors are not available, the request
> will fail with a 501 error.
> The name of a SlingPostProcessor will be defined by a newly defined service
> registration property {{postProcessor.name}} and default to the simple name
> of the SlingPostProcessor's implementation class if that property is not
> defined.
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