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

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<?php// +----------------------------------------------------------------------// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]// +----------------------------------------------------------------------// | Copyright (c) 2006-2013 http://thinkphp.cn All rights reserved.// +----------------------------------------------------------------------// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )// +----------------------------------------------------------------------// | Author: 何辉 <runphp@qq.com>// +----------------------------------------------------------------------namespace Think\Cache\Driver;use Memcached as MemcachedResource;use Think\Cache;/** * Memcached缓存驱动 * 感觉这个像是个服务器 分布式 服务器版本 */class Memcached extends Cache {    /**     * 统一的初始化，不一样的 开始，嘿嘿     * @param array $options     */    public function __construct($options = array()) {        if ( !extension_loaded('memcached') ) {            E(L('_NOT_SUPPORT_').':memcached');        }        $options = array_merge(array(            'servers'       =>  C('MEMCACHED_SERVER') ? : null,            'lib_options'   =>  C('MEMCACHED_LIB') ? : null        ), $options); // 这个合并真心好用        $this->options      =   $options;        $this->options['expire'] =  isset($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;        $this->handler      =   new MemcachedResource; // 变更具体的操作者        $options['servers'] && $this->handler->addServers($options['servers']);        $options['lib_options'] && $this->handler->setOptions($options['lib_options']);    }    /**     * 读取缓存     * @access public     * @param string $name 缓存变量名     * @return mixed     * 封装没什么意思     */    public function get($name) {        N('cache_read',1);        return $this->handler->get($this->options['prefix'].$name);    }    /**     * 写入缓存     * @access public     * @param string $name 缓存变量名     * @param mixed $value  存储数据     * @param integer $expire  有效时间（秒）     * @return boolean     */    public function set($name, $value, $expire = null) {        N('cache_write',1);// 记录次数        if(is_null($expire)) {            $expire  =  $this->options['expire'];        }        $name   =   $this->options['prefix'].$name;        if($this->handler->set($name, $value, time() + $expire)) {            if($this->options['length']>0) {                // 记录缓存队列                $this->queue($name); // 排队列            }            return true;        }        return false;    }    /**     * 删除缓存     * @access public     * @param string $name 缓存变量名     * @return boolean     * 单条删除     */    public function rm($name, $ttl = false) {        $name   =   $this->options['prefix'].$name;        return $ttl === false ?        $this->handler->delete($name) :        $this->handler->delete($name, $ttl);    }    /**     * 清除缓存     * @access public     * @return boolean     * 清空缓存 清除掉一切     */    public function clear() {        return $this->handler->flush();    }}
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