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<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace Think\Cache\Driver;
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use Think\Cache;
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defined('THINK_PATH') or exit();
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/**
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* Redis缓存驱动
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* 要求安装phpredis扩展：https://github.com/nicolasff/phpredis
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*/
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class Redis extends Cache {
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/**
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* 架构函数
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* @param array $options 缓存参数
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* @access public
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*/
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public function __construct($options=array()) {
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if ( !extension_loaded('redis') ) {
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E(L('_NOT_SUPPORT_').':redis');
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}
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$options = array_merge(array (
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'host' => C('REDIS_HOST') ? : '127.0.0.1',
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'port' => C('REDIS_PORT') ? : 6379,
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'timeout' => C('DATA_CACHE_TIMEOUT') ? : false,
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'persistent' => false,
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),$options);
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$this->options = $options;
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$this->options['expire'] = isset($options['expire'])? $options['expire'] : C('DATA_CACHE_TIME');
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$this->options['prefix'] = isset($options['prefix'])? $options['prefix'] : C('DATA_CACHE_PREFIX');
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$this->options['length'] = isset($options['length'])? $options['length'] : 0;
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$func = $options['persistent'] ? 'pconnect' : 'connect';
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$this->handler = new \Redis;
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$options['timeout'] === false ?
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$this->handler->$func($options['host'], $options['port']) :
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$this->handler->$func($options['host'], $options['port'], $options['timeout']);
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}
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/**
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* 读取缓存
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* @access public
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* @param string $name 缓存变量名
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* @return mixed
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*/
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public function get($name) {
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N('cache_read',1);
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$value = $this->handler->get($this->options['prefix'].$name);
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$jsonData = json_decode( $value, true );
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return ($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
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}
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/**
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* 写入缓存
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* @access public
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* @param string $name 缓存变量名
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* @param mixed $value 存储数据
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* @param integer $expire 有效时间（秒）
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* @return boolean
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*/
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public function set($name, $value, $expire = null) {
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N('cache_write',1);
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if(is_null($expire)) {
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$expire = $this->options['expire'];
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}
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$name = $this->options['prefix'].$name;
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//对数组/对象数据进行缓存处理，保证数据完整性
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$value = (is_object($value) || is_array($value)) ? json_encode($value) : $value;
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if(is_int($expire) && $expire) {
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$result = $this->handler->setex($name, $expire, $value);
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}else{
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$result = $this->handler->set($name, $value);
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}
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if($result && $this->options['length']>0) {
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// 记录缓存队列
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$this->queue($name);
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}
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return $result;
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}
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/**
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* 删除缓存
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* @access public
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* @param string $name 缓存变量名
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* @return boolean
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*/
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public function rm($name) {
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return $this->handler->delete($this->options['prefix'].$name);
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}
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/**
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* 清除缓存
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* @access public
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* @return boolean
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*/
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public function clear() {
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return $this->handler->flushDB();
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}
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}
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