com.sicheng.common.redis.Lock Maven / Gradle / Ivy
/**
* 本作品使用 木兰公共许可证,第2版(Mulan PubL v2) 开源协议,请遵守相关条款,或者联系sicheng.net获取商用授权。
* Copyright (c) 2016 SiCheng.Net
* This software is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
package com.sicheng.common.redis;
import com.sicheng.common.utils.IdGen;
import com.sicheng.common.utils.StringUtils;
import java.io.Closeable;
/**
* 分布式同步锁
*
* @author zhaolei
*/
public final class Lock implements Closeable {
//设想一下,如果一个请求更新缓存的时间比较长,甚至比锁的有效期还要长,
//导致在缓存更新过程中,锁就失效了,此时另一个请求会获取锁,但前一个请求在缓存更新完毕的时候,
//如果不加以判断直接删除锁,就会出现误删除其它请求创建的锁的情况,所以我们在创建锁的时候需要引入一个随机值
private final String id = IdGen.uuid();//随机数
private final String key;
public Lock(String key) {
this.key = StringUtils.join("LOCK#>", key);
}
public String getId() {
return id;
}
public String getKey() {
return this.key;
}
/**
* 释放锁
*
* @see java.io.Closeable#close()
*/
public void close() {
LockManagerFactory.getLockManager().unLock(this);
}
}