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thinkphp
2013-03-13 14:15:52 +08:00
commit b2b4edaee0
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<?php
// +----------------------------------------------------------------------
// | ThinkCache
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Think\Cache\Driver;
/**
* Redis缓存驱动
* 要求安装phpredis扩展https://github.com/nicolasff/phpredis
* @author 尘缘 <130775@qq.com>
*/
class Redis {
protected $handler = null;
protected $options = array(
'host' => '127.0.0.1',
'port' => 6379,
'timeout' => false,
'expire' => 0,
'persistent' => false,
'length' => 0,
);
/**
* 架构函数
* @param array $options 缓存参数
* @access public
*/
public function __construct($options=array()) {
if ( !extension_loaded('redis') ) {
throw new Exception('_NOT_SUPPERT_:redis');
}
if(!empty($options)) {
$this->options = array_merge($this->options,$options);
}
$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) {
return $this->handler->get($this->options['prefix'].$name);
}
/**
* 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, $expire = null) {
if(is_null($expire)) {
$expire = $this->options['expire'];
}
$name = $this->options['prefix'].$name;
if(is_int($expire)) {
$result = $this->handler->setex($name, $expire, $value);
}else{
$result = $this->handler->set($name, $value);
}
if($result && $this->options['length']>0) {
if($this->options['length']>0) {
// 记录缓存队列
$queue = $this->handler->get('__info__');
if(!$queue) {
$queue = array();
}
if(false===array_search($name, $queue)) array_push($queue,$name);
if(count($queue) > $this->options['length']) {
// 出列
$key = array_shift($queue);
// 删除缓存
$this->handler->delete($key);
}
$this->handler->set('__info__', $queue);
}
}
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();
}
}