<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Cache

 * @subpackage Zend_Cache_Backend

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

/**

 * @package    Zend_Cache

 * @subpackage Zend_Cache_Backend

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

interface Zend_Cache_Backend_Interface

{

    /**

     * Set the frontend directives

     *

     * @param array $directives assoc of directives

     */

    public function setDirectives($directives);

    /**

     * Test if a cache is available for the given id and (if yes) return it (false else)

     *

     * Note : return value is always "string" (unserialization is done by the core not by the backend)

     *

     * @param  string  $id                     Cache id

     * @param  boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested

     * @return string|false cached datas

     */

    public function load($id, $doNotTestCacheValidity = false);

    /**

     * Test if a cache is available or not (for the given id)

     *

     * @param  string $id cache id

     * @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record

     */

    public function test($id);

    /**

     * Save some string datas into a cache record

     *

     * Note : $data is always "string" (serialization is done by the

     * core not by the backend)

     *

     * @param  string $data            Datas to cache

     * @param  string $id              Cache id

     * @param  array $tags             Array of strings, the cache record will be tagged by each string entry

     * @param  int   $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)

     * @return boolean true if no problem

     */

    public function save($data, $id, $tags = array(), $specificLifetime = false);

    /**

     * Remove a cache record

     *

     * @param  string $id Cache id

     * @return boolean True if no problem

     */

    public function remove($id);

    /**

     * Clean some cache records

     *

     * Available modes are :

     * Zend_Cache::CLEANING_MODE_ALL (default)    => remove all cache entries ($tags is not used)

     * Zend_Cache::CLEANING_MODE_OLD              => remove too old cache entries ($tags is not used)

     * Zend_Cache::CLEANING_MODE_MATCHING_TAG     => remove cache entries matching all given tags

     *                                               ($tags can be an array of strings or a single string)

     * Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags}

     *                                               ($tags can be an array of strings or a single string)

     * Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags

     *                                               ($tags can be an array of strings or a single string)

     *

     * @param  string $mode Clean mode

     * @param  array  $tags Array of tags

     * @return boolean true if no problem

     */

    public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array());

}