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Smack/documentation/extensions/caps.md
Florian Schmaus 344148eaed Convert html documentation to markdown
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Entity Capabilities

This section details the usage of Smacks implementation of Entity Capabilities.

XEP related: XEP-0115: Entity Capabilities

Description

Entity Capabilities is a XMPP Protocol extension, which, in order to minimize network impact, caches the capabilities of XMPP entities. Those capabilities are determined with the help of the Service Discovery Protocol (XEP-0030).

Usage

Entity Capabilities work silenty in background when enabled. If the remote XMPP entity does not support XEP-0115 but XEP-0030 then XEP-0030 mechanisms are transparently used. You can enable or disable Entity Capabilities by using EntityCapsManager.

The cache used by Smack for Entity Capabilities is non-persistent as default. That is, the cache only uses memory. But it is also possible to set a persistent Entity Capabilities cache, which is recommended.

Examples

Enable Entity Capabilities

// Get an instance of entity caps manager for the specified connection
EntityCapsManager mgr = EntityCapsManager.getInstanceFor(connection);
// Enable entity capabilities
mgr.enableEntityCaps();

Configure a persistent cache for Entity Capabilities

// Get an instance of entity caps manager for the specified connection
EntityCapsManager mgr = EntityCapsManager.getInstanceFor(connection);
// Create an cache, see smackx.entitycaps.cache for pre-defined cache implementations
EntityCapsPersistentCache cache = new SimpleDirectoryPersistentCache(new File("/foo/cachedir"));
// Set the cache
mgr.setPersistentCache(cache);