ThinkPHP/Library/Vendor/Smarty/sysplugins/smarty_cacheresource_custom.php

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<?php
/**
 * Smarty Internal Plugin
 *
 * @package Smarty
 * @subpackage Cacher
 */

/**
 * Cache Handler API
 *
 * @package Smarty
 * @subpackage Cacher
 * @author Rodney Rehm
 */
abstract class Smarty_CacheResource_Custom extends Smarty_CacheResource {

    /**
     * fetch cached content and its modification time from data source
     *
     * @param string $id         unique cache content identifier
     * @param string $name       template name
     * @param string $cache_id   cache id
     * @param string $compile_id compile id
     * @param string $content    cached content
     * @param integer $mtime cache modification timestamp (epoch)
     * @return void
     */
    protected abstract function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime);

    /**
     * Fetch cached content's modification timestamp from data source
     *
     * {@internal implementing this method is optional.
     *  Only implement it if modification times can be accessed faster than loading the complete cached content.}}
     *
     * @param string $id         unique cache content identifier
     * @param string $name       template name
     * @param string $cache_id   cache id
     * @param string $compile_id compile id
     * @return integer|boolean timestamp (epoch) the template was modified, or false if not found
     */
    protected function fetchTimestamp($id, $name, $cache_id, $compile_id)
    {
        return null;
    }

    /**
     * Save content to cache
     *
     * @param string       $id         unique cache content identifier
     * @param string       $name       template name
     * @param string       $cache_id   cache id
     * @param string       $compile_id compile id
     * @param integer|null $exp_time   seconds till expiration or null
     * @param string $content content to cache
     * @return boolean success
     */
    protected abstract function save($id, $name, $cache_id, $compile_id, $exp_time, $content);