[李景山php]thinkphp核心源码注释|Redis.class.php
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<?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 * 看过了上述的各种浮云,so 觉得也没什么了 */class Redis extends Cache { /** * 架构函数 哥,咱们改个名字叫做构造函数呗 * @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; // 封包配合 $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);// 记录次数 $value = $this->handler->get($this->options['prefix'].$name); // 封装获取数据 在python 中 这个叫做多态 $jsonData = json_decode( $value, true ); // 最痛恨这个函数 return ($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, $expire = null) { N('cache_write',1); // 记录次数 if(is_null($expire)) { $expire = $this->options['expire']; } $name = $this->options['prefix'].$name; // 这个项目号 前缀 //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); // 队列记录 } return $result; } /** * 删除缓存 * @access public * @param string $name 缓存变量名 * @return boolean * 删除函数调用 */ public function rm($name) { return $this->handler->delete($this->options['prefix'].$name); } /** * 清除缓存 * @access public * @return boolean * 清楚数据缓存 */ public function clear() { return $this->handler->flushDB(); }}
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