<?php


// +----------------------------------------------------------------------


// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]


// +----------------------------------------------------------------------


// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.


// +----------------------------------------------------------------------


// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )


// +----------------------------------------------------------------------


// | Author: liu21st <liu21st@gmail.com>


// +----------------------------------------------------------------------


namespace Think\Cache\Driver;


use Think\Cache;


defined('THINK_PATH') or exit();





/**


 * Redis缓存驱动 


 * 要求安装phpredis扩展：https://github.com/nicolasff/phpredis


 */


class Redis extends Cache {


	 /**


	 * 架构函数


     * @param array $options 缓存参数


     * @access public


     */


    public function __construct($options=array()) {


        if ( !extension_loaded('redis') ) {


            E(L('_NOT_SUPPORT_').':redis');


        }


        $options = array_merge(array (


            'host'          => C('REDIS_HOST') ? : '127.0.0.1',


            'port'          => C('REDIS_PORT') ? : 6379,


            '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 \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 boolean


     */


    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) && $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 boolean


     */


    public function rm($name) {


        return $this->handler->delete($this->options['prefix'].$name);


    }





    /**


     * 清除缓存


     * @access public


     * @return boolean


     */


    public function clear() {


        return $this->handler->flushDB();


    }





}


