On Tue, Feb 4, 2020 at 12:08 AM Nedim Oren <[email protected]> wrote:

> just to understand the process...
> Is GeoServer going trough all of the individual data sources, making
> connection to each one of them one by one to verify/gather information for
> GetCapabilities response?   I always thought all the information needed for
> the GetCapabilities response is already stored in the Workspace as XML
> files and processing a number of XML files to create the GetCapabilites
> response is what GoeServer does to create the response.
>

Not all the information is stored, the list of attributes is computed at
runtime, but it's stored in a cache in the ResourcePool. The cache by
default has 100 hard references plus a free amount of soft references that
can be freed when there is GC pressure. The number of hard references is
tunable, see
https://docs.geoserver.org/stable/en/user/configuration/globalsettings.html#feature-type-cache-size
The capabilities transformer needs to perform some checks, so it iterates
over all the feature types, the first time actually opening connections,
the other times (hopefully) hitting the cache.
Mind, calls to "reset" and "reload" (status page, REST API) wipe out the
cache completely.

Cheers
Andrea

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