memcache.php

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<?php
function is_memcache_available() {
    return (bool) _elgg_services()->memcacheStashPool;
}

function _elgg_invalidate_memcache_for_entity($entity_guid) {
    _elgg_get_memcache('new_entity_cache')->delete($entity_guid);
}

function _elgg_get_memcache($namespace = 'default') {
    static $caches = array();

    $cache_pool = _elgg_services()->memcacheStashPool;
    if (!$cache_pool) {
        return _elgg_services()->nullCache;
    }

    if (!isset($caches[$namespace])) {
        $caches[$namespace] = new ElggMemcache($namespace, $cache_pool);
    }
    return $caches[$namespace];
}