smarty/tests/UnitTests/__shared/cacheresources/cacheresource.memcache.php

<?php

/**
 * Memcache CacheResource
 * CacheResource Implementation based on the KeyValueStore API to use
 * memcache as the storage resource for Smarty's output caching.
 * Note that memcache has a limitation of 256 characters per cache-key.
 * To avoid complications all cache-keys are translated to a sha1 hash.
 *

 * @author  Rodney Rehm
 */
class Smarty_CacheResource_Memcache extends \Smarty\Cacheresource\KeyValueStore
{
    /**
     * memcache instance
     *
     * @var Memcache
     */
    private $memcache = null;

	/**
	 * @return Memcache|Memcached
	 */
	public function getMemcache() {
		if ($this->memcache ===  null) {
			if (class_exists('Memcached')) {
				$this->memcache = new Memcached();
			} else {
				$this->memcache = new Memcache();
			}
			$this->memcache->addServer('127.0.0.1', 11211);
		}
		return $this->memcache;
	}

    /**
     * Read values for a set of keys from cache
     *
     * @param array $keys list of keys to fetch
     *
     * @return array   list of values with the given keys used as indexes
     * @return boolean true on success, false on failure
     */
    protected function read(array $keys)
    {
        $res = array();
        foreach ($keys as $key) {
            $k = sha1($key);
            $res[$key] = $this->getMemcache()->get($k);
        }
        return $res;
    }

    /**
     * Save values for a set of keys to cache
     *
     * @param array $keys   list of values to save
     * @param int   $expire expiration time
     *
     * @return boolean true on success, false on failure
     */
    protected function write(array $keys, $expire = null)
    {
        foreach ($keys as $k => $v) {
            $k = sha1($k);
            if (class_exists('Memcached')) {
                $this->getMemcache()->set($k, $v, $expire);
            } else {
                $this->getMemcache()->set($k, $v, 0, $expire);
            }
        }
        return true;
    }

    /**
     * Remove values from cache
     *
     * @param array $keys list of keys to delete
     *
     * @return boolean true on success, false on failure
     */
    protected function delete(array $keys)
    {
        foreach ($keys as $k) {
            $k = sha1($k);
            $this->getMemcache()->delete($k);
        }
        return true;
    }

    /**
     * Remove *all* values from cache
     *
     * @return boolean true on success, false on failure
     */
    protected function purge()
    {
        return $this->getMemcache()->flush();
    }
}