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From Reto Bachmann-Gmür (JIRA) <j...@apache.org>
Subject [jira] [Commented] (CLEREZZA-460) Use whiteboard pattern for Renderlets
Date Wed, 06 Apr 2011 11:46:05 GMT

    [ https://issues.apache.org/jira/browse/CLEREZZA-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016349#comment-13016349
] 

Reto Bachmann-Gmür commented on CLEREZZA-460:
---------------------------------------------

Hi Daniel,

The situation I was thinking at is:
Bundle A registered an SSP x with RenderletManager.
Bundle B wants to override the Renderlet  created for SSP x by implementing a typerenderlet.

If A is restared the service provided by B will disappear and only the typerenderlet provided
by RenderletManagerImpl will be available, ven though the other typerenderlet would have a
higher priority.


Problems also occur when one registers a service via ScalaServePagesService.registerScalaServerPage
and duly unregisters it in the deactivate method.

> Use whiteboard pattern for Renderlets
> -------------------------------------
>
>                 Key: CLEREZZA-460
>                 URL: https://issues.apache.org/jira/browse/CLEREZZA-460
>             Project: Clerezza
>          Issue Type: Improvement
>            Reporter: Reto Bachmann-Gmür
>            Assignee: Reto Bachmann-Gmür
>         Attachments: patch-typerendering-core.diff, renderletmgr_patch.diff
>
>
> The current mechanism for renderlets is overly complex. Instead of describing renderlets
in a graph rendelets should be services that have properties indicating the rdf type and the
mode-pattern they handle.
> The priority for selecting renderlets should be:
> - type, according to type-priority list
> - length of regex math (the matching regex with the most alphanumeric characters wins)
> - startlevel of the bundle providing the service

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