[李景山php]thinkphp核心源码注释|Xcache.class.php

<?php// +----------------------------------------------------------------------// | ThinkPHP [ WE CAN DO IT JUST THINK ]// +----------------------------------------------------------------------// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.// +----------------------------------------------------------------------// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )// +----------------------------------------------------------------------// | Author: liu21st <[e-mail]>// +----------------------------------------------------------------------namespace Think\Cache\Driver;use Think\Cache;defined('THINK_PATH') or exit();/** * Xcache缓存驱动 */// 属于 opcode 一类的缓存加速class Xcache extends Cache {    /**     * 架构函数     * @param array $options 缓存参数     * @access public     */    public function __construct($options=array()) {        if ( !function_exists('xcache_info') ) {            E(L('_NOT_SUPPORT_').':Xcache');        }        $this->options['expire']    =   isset($options['expire'])?$options['expire']:C('DATA_CACHE_TIME');        $this->options['prefix']    =   isset($options['prefix'])?$options['prefix']:C('DATA_CACHE_PREFIX');        $this->options['length']    =   isset($options['length'])?$options['length']:0;    }    /**     * 读取缓存     * @access public     * @param string $name 缓存变量名     * @return mixed     * 哥哥还能在简单点吗？     */    public function get($name) {        N('cache_read',1);        $name   =   $this->options['prefix'].$name;        if (xcache_isset($name)) {            return xcache_get($name);        }        return false;    }    /**     * 写入缓存     * @access public     * @param string $name 缓存变量名     * @param mixed $value  存储数据     * @param integer $expire  有效时间（秒）     * @return boolean     * 同上     */    public function set($name, $value,$expire=null) {        N('cache_write',1);        if(is_null($expire)) {            $expire = $this->options['expire'] ;        }        $name   =   $this->options['prefix'].$name;        if(xcache_set($name, $value, $expire)) {            if($this->options['length']>0) {                // 记录缓存队列                $this->queue($name);            }            return true;        }        return false;    }    /**     * 删除缓存     * @access public     * @param string $name 缓存变量名     * @return boolean     * 同上     */    public function rm($name) {        return xcache_unset($this->options['prefix'].$name);    }    /**     * 清除缓存     * @access public     * @return boolean     * 各种接口啊     */    public function clear() {        return xcache_clear_cache(1, -1);    }}// 越复杂的东西用起来越简单。