<?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');
        }
        $options = array_merge(array (
            'host'          => C('REDIS_HOST') ? : '127.0.0.1',
            'port'          => C('REDIS_PORT') ? : 6379,
            'auth'          => C('REDIS_AUTH') ? : null,
            'timeout'       => C('DATA_CACHE_TIMEOUT') ? : false,
            'persistent'    => false,
        ),$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'], $options['timeout']);
        //支持认证模式 @author 1135
        if($this->options['auth']!=null)
        {
            $this->handler->auth($this->options['auth']);
        }
        //支持选择实例 @author 1135
        $this->options['db'] = isset($this->options['db']) ? $this->options['db'] : 0;
        $this->handler->select($this->options['db']);
    }

    /**
     * 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
    }*/


    /**
     * 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();
    }

}