Thanks for the reply Andrea, someone also mentioned that because the cache is
stored as flat files, I could just write a scheduled task to delete these files
on the server? (this wouldn’t obviously work for the scenario I asked, but I
think I would be fine with just deleting the cache each night).
Chris
From: andrea.a...@gmail.com [mailto:andrea.a...@gmail.com] On Behalf Of Andrea
Aime
Sent: 20 April 2016 17:33
To: Chris Buckmaster
Cc: geoserver-users@lists.sourceforge.net
Subject: Re: [Geoserver-users] How to delete tile layer cache if layer data is
updated?
On Tue, Apr 19, 2016 at 10:02 AM, Chris Buckmaster
<chris.buckmas...@runnymede.gov.uk<mailto:chris.buckmas...@runnymede.gov.uk>>
wrote:
Hi
I am just wondering if there is a way to programmatically delete a tile layer’s
cache if the data from the layer is updated?
GWC exposes a REST api with a truncate call that you can use to delete selected
areas and zoom levels (or just everything if you want).
See the documentation:
http://docs.geoserver.org/2.8.x/en/user/geowebcache/rest/index.html
Currently looking at trying to create a script that will just delete the cache
from a scheduled task so I can make sure that the data is as current as
possible (within the last day) when users are accessing the web application
with the data on, but it would be even better if I can make it completely
current.
Just call trucante when your data changes? The main issue is, how will
GeoServer get to know your
data changed? No data source normally provides this information as an "event".
If you have a database, maybe you can setup triggers that can call the GWC rest
api for you.
Or, if you modify the data via WFS-T though GeoServer, then it will be fully
automatic (there is
an event that WFS sends to GWC to make it drop tiles)
Hope this helps
Cheers
Andrea
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