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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> <!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --> <title>Shared Object Cache in Apache HTTP Server - Apache HTTP Server Version 2.4</title> <link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> <link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> <link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="./style/css/prettify.css" /> <script src="./style/scripts/prettify.min.js" type="text/javascript"> </script> <link href="./images/favicon.ico" rel="shortcut icon" /></head> <body id="manual-page" class="no-sidebar"><div id="page-header"> <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p> <p class="apache">Apache HTTP Server Version 2.4</p> <img alt="" src="./images/feather.png" /></div> <div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div> <div id="path"> <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.4</a></div><div id="page-content"><div id="preamble"><h1>Shared Object Cache in Apache HTTP Server</h1> <div class="toplang"> <p><span>Available Languages: </span><a href="./en/socache.html" title="English"> en </a> | <a href="./fr/socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> </div> <p>The Shared Object Cache provides a means to share simple data across all a server's workers, regardless of <a href="mpm.html">thread and process models</a>. It is used where the advantages of sharing data across processes outweigh the performance overhead of inter-process communication.</p> </div> <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> <div class="section"> <h2><a name="providers" id="providers">Shared Object Cache Providers</a></h2> <p>The shared object cache as such is an abstraction. Five different modules implement it. To use the cache, one or more of these modules must be present, and configured.</p> <p>The only configuration required is to select which cache provider to use. This is the responsibility of modules using the cache, and they enable selection using directives such as <code class="directive"><a href="./mod/mod_cache_socache.html#cachesocache">CacheSocache</a></code>, <code class="directive"><a href="./mod/mod_authn_socache.html#authncachesocache">AuthnCacheSOCache</a></code>, <code class="directive"><a href="./mod/mod_ssl.html#sslsessioncache">SSLSessionCache</a></code>, and <code class="directive"><a href="./mod/mod_ssl.html#sslstaplingcache">SSLStaplingCache</a></code>.</p> <p>Currently available providers are:</p> <dl> <dt>"dbm" (<code class="module"><a href="./mod/mod_socache_dbm.html">mod_socache_dbm</a></code>)</dt> <dd>This makes use of a DBM hash file. The choice of underlying DBM used may be configurable if the installed APR version supports multiple DBM implementations.</dd> <dt>"dc" (<code class="module"><a href="./mod/mod_socache_dc.html">mod_socache_dc</a></code>)</dt> <dd>This makes use of the <a href="http://distcache.sourceforge.net/">distcache</a> distributed session caching libraries.</dd> <dt>"memcache" (<code class="module"><a href="./mod/mod_socache_memcache.html">mod_socache_memcache</a></code>)</dt> <dd>This makes use of the <a href="http://memcached.org/">memcached</a> high-performance, distributed memory object caching system.</dd> <dt>"redis" (<code class="module"><a href="./mod/mod_socache_redis.html">mod_socache_redis</a></code>)</dt> <dd>This makes use of the <a href="http://redis.io/">Redis</a> high-performance, distributed memory object caching system.</dd> <dt>"shmcb" (<code class="module"><a href="./mod/mod_socache_shmcb.html">mod_socache_shmcb</a></code>)</dt> <dd>This makes use of a high-performance cyclic buffer inside a shared memory segment.</dd> </dl> <p>The API provides the following functions:</p> <dl> <dt>const char *create(ap_socache_instance_t **instance, const char *arg, apr_pool_t *tmp, apr_pool_t *p);</dt> <dd>Create a session cache based on the given configuration string. The instance pointer returned in the instance parameter will be passed as the first argument to subsequent invocations.</dd> <dt>apr_status_t init(ap_socache_instance_t *instance, const char *cname, const struct ap_socache_hints *hints, server_rec *s, apr_pool_t *pool)</dt> <dd>Initialize the cache. The cname must be of maximum length 16 characters, and uniquely identifies the consumer of the cache within the server; using the module name is recommended, e.g. "mod_ssl-sess". This string may be used within a filesystem path so use of only alphanumeric [a-z0-9_-] characters is recommended. If hints is non-NULL, it gives a set of hints for the provider. Return APR error code.</dd> <dt>void destroy(ap_socache_instance_t *instance, server_rec *s)</dt> <dd>Destroy a given cache instance object.</dd> <dt>apr_status_t store(ap_socache_instance_t *instance, server_rec *s, const unsigned char *id, unsigned int idlen, apr_time_t expiry, unsigned char *data, unsigned int datalen, apr_pool_t *pool)</dt> <dd>Store an object in a cache instance.</dd> <dt>apr_status_t retrieve(ap_socache_instance_t *instance, server_rec *s, const unsigned char *id, unsigned int idlen, unsigned char *data, unsigned int *datalen, apr_pool_t *pool)</dt> <dd>Retrieve a cached object.</dd> <dt>apr_status_t remove(ap_socache_instance_t *instance, server_rec *s, const unsigned char *id, unsigned int idlen, apr_pool_t *pool)</dt> <dd>Remove an object from the cache.</dd> <dt>void status(ap_socache_instance_t *instance, request_rec *r, int flags)</dt> <dd>Dump the status of a cache instance for mod_status.</dd> <dt>apr_status_t iterate(ap_socache_instance_t *instance, server_rec *s, void *userctx, ap_socache_iterator_t *iterator, apr_pool_t *pool)</dt> <dd>Dump all cached objects through an iterator callback.</dd> </dl> </div></div> <div class="bottomlang"> <p><span>Available Languages: </span><a href="./en/socache.html" title="English"> en </a> | <a href="./fr/socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> </div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. 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