[Geoserver-devel] Add per-workspace support for WFS Stored Queries WIP

[<fer...@ge...>]

   Hi community,

   I'm working on adding per-workspace WFS 2.0 Stored queries support.

   The core concept is that we will allow the creation of stored queries per workspace​:
     * when creating a stored query, if a workspace virtual service end-point is used, then the query will belong to that workspace:
          + but that query will only be visible \ usable from that workspace virtual end-point
     * if no workspace virtual service is used, then the stored query will be global

   In terms of stored queries usage (list stored queries, execute a stored query, etc ...):
     * when targeting the global GeoServer end-point, only global stored queries will be visible:
          + hence two stored queries of different workspaces can have the same id
     * when targeting a workspace virtual service end-point, the workspace stored queries and global stored queries that don't collide (don't have the same id) will be considered:
          + considering also global queries will allow the definition of more generic stored queries, hence removing the need of duplication
          + considering global queries will be activated by default, but can be deactivated (flag in the WFS workspace configuration)

   In terms of backwards compatibility:
     * global stored queries will be stored as they are now, so no data directory migration need
     * ​for backwards compatibility, a flag deactivating per workspace stored queries will be added:
          + if an user was using a virtual service end-point for creating stored-queries (we can do that now but the stored query will be global anyway), it can use that global flag to deactivate the new functionality

   I would like to backport this feature, so proposed default behavior is:

     * Activated by default on master branch.
     * Deactivated by default on backport branches.

   Do you have comments, suggestions on this plan?
   Current PR for master branch, if anyone wants to check/review:
   https://github.com/geoserver/geoserver/pull/3867

   Regards,

   Fernando Mino

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   Fernando Mino

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