Skip to the content.

Gyro-PHP > Documentation

• Home
• Downloads
• Tutorials
• Showcases
• Documentation
• Report Bug

contributions/cache.xcache/cache.xcache12.impl.php

Go to the documentation of this file.

<?php
require_once dirname(__FILE__) . '/cache.xcache.impl.php';

/**
 * Cache Persistance using XCache 1.2
 * 
 * @author Gerd Riesselmann
 * @ingroup XCache
 */
class CacheXCache12Impl extends CacheXCacheImpl {
        /**
         * Clear all cache
         */
        protected function do_clear_all() {
                $this->do_clear(array());
        }
        
        /**
         * Clear cache for given cache key(s)
         */
        protected function do_clear($cache_keys) {
                // We have do do a clear on 
                // - App Key
                // - Cache Keys
                // - *
                // This means we increment namespace of last key
                // But first, strip of empty keys from the end of the array
                $cleaned = $this->preprocess_keys($cache_keys, false);
                $ns = $this->get_keys_namespaces($cleaned);
                $n = array_pop($ns);
                if ($n) {
                        // See http://code.google.com/p/memcached/wiki/FAQ#Deleting%5Fby%5FNamespace
                        // for how this trick works
                        xcache_inc($n, 1);
                }
        }
        
        /**
         * Transform the given param into a key string
         * 
         * @param Mixed A set of key params, may be an array or a string
         */
        protected function flatten_keys($cache_keys) {
                $cache_keys = $this->preprocess_keys($cache_keys);
                $ns_keys = $this->get_keys_namespaces($cache_keys);
                
                $tmp = array();
                foreach($cache_keys as $key) {
                        $tmp[] = $key . ':=' . $this->get_namespace_value(array_shift($ns_keys));
                }
                
                return implode('_', $tmp);              
        }
                
        /**
         * Return array of namespaces for keys
         * 
         * See http://code.google.com/p/memcached/wiki/FAQ#Deleting%5Fby%5FNamespace
         * 
         * @param Mixed A set of key params, may be an array or a string
         * @return array
         */
        protected function get_keys_namespaces($cache_keys) {
                $ret = array();
                foreach(Arr::force($cache_keys, true) as $key) {
                        $ns_key .= 'g$ns' . $key;
                        $ret[] = $ns_key;
                }
                return $ret;
        }

        /**
         * Get value of namespace counter
         * 
         * @param string $ns Namespace 
         */
        protected function get_namespace_value($ns) {
                if (xcache_isset($ns)) {
                        $ret = xcache_get($ns);
                }
                else {
                        // This should be a transacton
                        $ret = rand(1, 1000);
                        xcache_set($ns, $ret);          
                }
                return $ret;
        }       
}

Imprint