Spatial Engine Cache
- Shaun Forbes
This is a virtual spatial engine that provides caching for other spatial engines.
Available from Weave 2.6.4.
Namespace
urn:com.cohga.server.spatial.geotools#1.0
Tags
spatialengine
Properties
Name | Type | Required | Description |
|---|---|---|---|
id | string | yes | Unique identifier |
dbtype | ‘cache’ | yes | The name of the driver to use, in this case “cache” |
datasource | string | yes | The id of the spatial engine that will provide the data for this spatail engine |
maxAgeSeconds | integer | no | How may seconds should the data in the cache be kept for before it is re-fetched from the source spatial engine. If this is not set then the data will be read once when first accessed and not updated after that. |
autoRenew | boolean | no | Should the data be fetched periodically in the background? If this is set to false the underlying data will be re-fetched at the time it’s access if it is older than maxAgeSeconds seconds old. If this isn’t set or is set to true then the data will be periodically be checked if it is older than mapAgeSeconds seconds old and re-fetched and replace the existing cached data. |
evictorPeriodicitySeconds | integer | no | The number of seconds to wait between background checks to see if data is exposed, default is 300 seconds. |
evictorParallellism | integer | no | The number of expired layers to fetch at one from the server during a background load when the data has expired, default is 1. |
Sub-tags
None
Content
None
Examples
<!-- create the source for the data to be cached
in this case we're using an WFS service -->
<spatial:spatialengine id="spatialengine.wfsng.source">
<dbtype>wfs-ng</dbtype>
<url><![CDATA[http://vmrunout:8080/geoserver/ows]]></url>
<protocol>get</protocol>
<username>username</username>
<password>password</password>
<timeout>60000</timeout>
<buffersize>100000</buffersize>
<gzip>false</gzip>
<lenient>true</lenient>
</spatial:spatialengine>
<!-- create the cache referring to the WFS spatial engine
this is what you should refer in the rest of the config -->
<spatial:spatialengine id="spatialengine.wfsng>
<dbtype>cache</dbtype>
<datasource>spatialengine.wfsng.source</datasource>
<maxAgeSeconds>3600</maxAgeSeconds>
</spatial:spatialengine>