<?php

/**

 * APC CacheResource

 * CacheResource Implementation based on the KeyValueStore API to use

 * memcache as the storage resource for Smarty's output caching.

 * *

 *

 * @package CacheResource-examples

 * @author  Uwe Tews

 */

class Smarty_CacheResource_Apc extends Smarty_CacheResource_KeyValueStore {

    public function __construct() {

        // test if APC is present

        if (!function_exists('apc_cache_info')) {

            throw new Exception('APC Template Caching Error: APC is not installed');

        }

    }

    /**

     * 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();

        $res = apc_fetch($keys);

        foreach ($res as $k => $v) {

            $_res[$k] = $v;

        }

        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) {

            apc_store($k, $v, $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) {

            apc_delete($k);

        }

        return true;

    }

    /**

     * Remove *all* values from cache

     *

     * @return boolean true on success, false on failure

     */

    protected function purge() {

        return apc_clear_cache('user');

    }

}