50 lines
1.6 KiB
Markdown
50 lines
1.6 KiB
Markdown
Entity Capabilities
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===================
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[Back](index.md)
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This section details the usage of Smacks implementation of Entity
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Capabilities.
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**XEP related:** [XEP-0115: Entity Capabilities](http://xmpp.org/extensions/xep-0115.html)
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**Description**
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Entity Capabilities is an XMPP Protocol extension, which, in order to minimize
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network impact, caches the capabilities of XMPP entities. Those capabilities
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are determined with the help of the Service Discovery Protocol
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([XEP-0030](http://xmpp.org/extensions/xep-0030.html)).
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**Usage**
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Entity Capabilities work silenty in background when enabled. If the remote
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XMPP entity does not support XEP-0115 but XEP-0030 then XEP-0030 mechanisms
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are transparently used. You can enable or disable Entity Capabilities by using
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_**EntityCapsManager**_.
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The cache used by Smack for Entity Capabilities is non-persistent as default.
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That is, the cache only uses memory. But it is also possible to set a
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persistent Entity Capabilities cache, which is recommended.
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**Examples**
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Enable Entity Capabilities
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```
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// Get an instance of entity caps manager for the specified connection
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EntityCapsManager mgr = EntityCapsManager.getInstanceFor(connection);
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// Enable entity capabilities
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mgr.enableEntityCaps();
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```
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Configure a persistent cache for Entity Capabilities
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```
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// Get an instance of entity caps manager for the specified connection
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EntityCapsManager mgr = EntityCapsManager.getInstanceFor(connection);
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// Create an cache, see smackx.entitycaps.cache for pre-defined cache implementations
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EntityCapsPersistentCache cache = new SimpleDirectoryPersistentCache(new File("/foo/cachedir"));
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// Set the cache
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mgr.setPersistentCache(cache);
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```
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