【thinkphp3.1.x】thinkphp3.1.x中有关memcache缓存相关的文件

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

defined('THINK_PATH') or exit();
/**
* Memcache缓存驱动
* @category   Extend
* @package  Extend
* @subpackage  Driver.Cache
* @author    liu21st <liu21st@gmail.com>
*/
class CacheMemcache extends Cache {

/**
* 架构函数
* @param array $options 缓存参数
* @access public
*/
function __construct($options=array()) {
if ( !extension_loaded('memcache') ) {
throw_exception(L('_NOT_SUPPERT_').':memcache');
}

$options = array_merge(array (
'host'        =>  C('MEMCACHE_HOST') ? C('MEMCACHE_HOST') : '127.0.0.1',
'port'        =>  C('MEMCACHE_PORT') ? C('MEMCACHE_PORT') : 11211,
'timeout'     =>  C('DATA_CACHE_TIMEOUT') ? C('DATA_CACHE_TIMEOUT') : false,
'persistent'  =>  false,
),$options);

$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;
$func               =   $options['persistent'] ? 'pconnect' : 'connect';
$this->handler      =   new Memcache;
$options['timeout'] === false ?
$this->handler->$func($options['host'], $options['port']) :
$this->handler->$func($options['host'], $options['port'], $options['timeout']);
}

/**
* 读取缓存
* @access public
* @param string $name 缓存变量名
* @return mixed
*/
public function get($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 $expire  有效时间（秒）
* @return boolen
*/
public function set($name, $value, $expire = null) {
N('cache_write',1);
if(is_null($expire)) {
$expire  =  $this->options['expire'];
}
$name   =   $this->options['prefix'].$name;
if($this->handler->set($name, $value, 0, $expire)) {
if($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 $name 缓存变量名
* @return boolen
*/
public function rm($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 boolen
*/
public function clear() {
return $this->handler->flush();
}
}