【thinkphp3.1.x】thinkphp3.1.x中有关redis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();

/**
* Redis缓存驱动
* 要求安装phpredis扩展：https://github.com/nicolasff/phpredis
* @category   Extend
* @package  Extend
* @subpackage  Driver.Cache
* @author    尘缘 <130775@qq.com>
*/
class CacheRedis extends Cache {
/**
* 架构函数
* @param array $options 缓存参数
* @access public
*/
public function __construct($options=array()) {
if ( !extension_loaded('redis') ) {
throw_exception(L('_NOT_SUPPERT_').':redis');
}
if(empty($options)) {
$options = array (
'host'          => C('REDIS_HOST') ? C('REDIS_HOST') : '127.0.0.1',
'port'          => C('REDIS_PORT') ? C('REDIS_PORT') : 6379,
'timeout'       => C('DATA_CACHE_TIMEOUT') ? C('DATA_CACHE_TIMEOUT') : false,
'persistent'    => false,
);
}
$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 Redis;
$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);
$value = $this->handler->get($this->options['prefix'].$name);
$jsonData  = json_decode( $value, true );
return ($jsonData === NULL) ? $value : $jsonData;	//检测是否为JSON数据 true 返回JSON解析数组, false返回源数据
}

/**
* 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;
//对数组/对象数据进行缓存处理，保证数据完整性
$value  =  (is_object($value) || is_array($value)) ? json_encode($value) : $value;
if(is_int($expire)) {
$result = $this->handler->setex($name, $expire, $value);
}else{
$result = $this->handler->set($name, $value);
}
if($result && $this->options['length']>0) {
// 记录缓存队列
$this->queue($name);
}
return $result;
}

/**
* 删除缓存
* @access public
* @param string $name 缓存变量名
* @return boolen
*/
public function rm($name) {
return $this->handler->delete($this->options['prefix'].$name);
}

/**
* 清除缓存
* @access public
* @return boolen
*/
public function clear() {
return $this->handler->flushDB();
}

}