<?php
/**
* Redis锁操作类
* Date: 2017-06-30
* Author: fdipzone
* Ver: 1.0
*
* Func:
* public lock 获取锁
* public unlock 释放锁
* private connect 连接
*/
class RedisLock { // class start
private $_config;
private $_redis;
/**
* 初始化
* @param Array $config redis连接设定
*/
public function __construct($config=array()){
$this->_config = $config;
$this->_redis = $this->connect();
}
/**
* 获取锁
* @param String $key 锁标识
* @param Int $expire 锁过期时间
* @return Boolean
*/
public function lock($key, $expire=5){
$is_lock = $this->_redis->setnx($key, time()+$expire);
// 不能获取锁
if(!$is_lock){
// 判断锁是否过期
$lock_time = $this->_redis->get($key);
// 锁已过期,删除锁,重新获取
if(time()>$lock_time){
$this->unlock($key);
$is_lock = $this->_redis->setnx($key, time()+$expire);
}
}
return $is_lock? true : false;
}
/**
* 释放锁
* @param String $key 锁标识
* @return Boolean
*/
public function unlock($key){
return $this->_redis->del($key);
}
/**
* 创建redis连接
* @return Link
*/
private function connect(){
try{
$redis = new Redis();
$redis->connect($this->_config['host'],$this->_config['port'],$this->_config['timeout'],$this->_config['reserved'],$this->_config['retry_interval']);
if(empty($this->_config['auth'])){
$redis->auth($this->_config['auth']);
}
$redis->select($this->_config['index']);
}catch(RedisException $e){
throw new Exception($e->getMessage());
return false;
}
return $redis;
}
} // class end
?>
demo.php
<?php
require 'RedisLock.class.php';
$config = array(
'host' => 'localhost',
'port' => 6379,
'index' => 0,
'auth' => '',
'timeout' => 1,
'reserved' => NULL,
'retry_interval' => 100,
);
// 创建redislock对象
$oRedisLock = new RedisLock($config);
// 定义锁标识
$key = 'mylock';
// 获取锁
$is_lock = $oRedisLock->lock($key, 10);
if($is_lock){
echo 'get lock success<br>';
echo 'do sth..<br>';
sleep(5);
echo 'success<br>';
$oRedisLock->unlock($key);
// 获取锁失败
}else{
echo 'request too frequently<br>';
}
?>
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