[jira] [Commented] (SLING-2076) Make MapEntries more dynamic

["Carsten Ziegeler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SLING-2076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059829#comment-13059829 ] 

Carsten Ziegeler commented on SLING-2076:
-----------------------------------------

As discussed in the mail thread, basically we have three options
a) Specify a service interface which returns the mapping - if such a service is available use this, otherwise use the default implementation
b) Like a) but allow several implementations of the service and aggregate the results
c) Instead of specifying a service interface to return the mappings, we could specify a service interface for mapping

I prefer b) over a) - while c) looks tempting I see the ordering problem, e.g. if we have two providers. Provider A provides mapping for /a and /a/b/c while Provider B provides mappings for /a/b. Depending on which provider is called first we get different results for /a/b/x and /a/b/c/z
We could invoke all providers and weight the results and then use the one with the highest weight of course

However as noone came up with real use cases for c), I think we should go with b)


> Make MapEntries more dynamic
> ----------------------------
>
>                 Key: SLING-2076
>                 URL: https://issues.apache.org/jira/browse/SLING-2076
>             Project: Sling
>          Issue Type: Improvement
>          Components: JCR
>    Affects Versions: JCR Resource 2.0.10
>            Reporter: Vidar S. Ramdal
>            Assignee: Vidar S. Ramdal
>             Fix For: JCR Resource 2.1.0
>
>
> In some scenarios it would be nice to be able to store mapping specs other places than under /etc/map (for instance scattered around the repository/resource tree, or in an external XML file). 
> It would be better if the entire map specification was provided by a separate service. The current MapEntries would act as the default implementation.
> Mailing list discussion: http://markmail.org/thread/5ww634sqarxtudks

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