Redis实现分布式锁
来源:互联网 发布:通信网络维护 编辑:程序博客网 时间:2024/06/03 14:19
版权声明:本文为博主原创文章,未经博主允许不得转载。
[java] view plain copy print?
- /**
- * @author http://blog.csdn.net/java2000_wl
- * @version <b>1.0.0</b>
- */
- public class RedisBillLockHandler implements IBatchBillLockHandler {
- private static final Logger LOGGER = LoggerFactory.getLogger(RedisBillLockHandler.class);
- private static final int DEFAULT_SINGLE_EXPIRE_TIME = 3;
- private static final int DEFAULT_BATCH_EXPIRE_TIME = 6;
- private final JedisPool jedisPool;
- /**
- * 构造
- * @author http://blog.csdn.net/java2000_wl
- */
- public RedisBillLockHandler(JedisPool jedisPool) {
- this.jedisPool = jedisPool;
- }
- /**
- * 获取锁 如果锁可用 立即返回true, 否则返回false
- * @author http://blog.csdn.net/java2000_wl
- * @param billIdentify
- * @return
- */
- public boolean tryLock(IBillIdentify billIdentify) {
- return tryLock(billIdentify, 0L, null);
- }
- /**
- * 锁在给定的等待时间内空闲,则获取锁成功 返回true, 否则返回false
- * @author http://blog.csdn.net/java2000_wl
- * @param billIdentify
- * @param timeout
- * @param unit
- * @return
- */
- public boolean tryLock(IBillIdentify billIdentify, long timeout, TimeUnit unit) {
- String key = (String) billIdentify.uniqueIdentify();
- Jedis jedis = null;
- try {
- jedis = getResource();
- long nano = System.nanoTime();
- do {
- LOGGER.debug("try lock key: " + key);
- Long i = jedis.setnx(key, key);
- if (i == 1) {
- jedis.expire(key, DEFAULT_SINGLE_EXPIRE_TIME);
- LOGGER.debug("get lock, key: " + key + " , expire in " + DEFAULT_SINGLE_EXPIRE_TIME + " seconds.");
- return Boolean.TRUE;
- } else { // 存在锁
- if (LOGGER.isDebugEnabled()) {
- String desc = jedis.get(key);
- LOGGER.debug("key: " + key + " locked by another business:" + desc);
- }
- }
- if (timeout == 0) {
- break;
- }
- Thread.sleep(300);
- } while ((System.nanoTime() - nano) < unit.toNanos(timeout));
- return Boolean.FALSE;
- } catch (JedisConnectionException je) {
- LOGGER.error(je.getMessage(), je);
- returnBrokenResource(jedis);
- } catch (Exception e) {
- LOGGER.error(e.getMessage(), e);
- } finally {
- returnResource(jedis);
- }
- return Boolean.FALSE;
- }
- /**
- * 如果锁空闲立即返回 获取失败 一直等待
- * @author http://blog.csdn.net/java2000_wl
- * @param billIdentify
- */
- public void lock(IBillIdentify billIdentify) {
- String key = (String) billIdentify.uniqueIdentify();
- Jedis jedis = null;
- try {
- jedis = getResource();
- do {
- LOGGER.debug("lock key: " + key);
- Long i = jedis.setnx(key, key);
- if (i == 1) {
- jedis.expire(key, DEFAULT_SINGLE_EXPIRE_TIME);
- LOGGER.debug("get lock, key: " + key + " , expire in " + DEFAULT_SINGLE_EXPIRE_TIME + " seconds.");
- return;
- } else {
- if (LOGGER.isDebugEnabled()) {
- String desc = jedis.get(key);
- LOGGER.debug("key: " + key + " locked by another business:" + desc);
- }
- }
- Thread.sleep(300);
- } while (true);
- } catch (JedisConnectionException je) {
- LOGGER.error(je.getMessage(), je);
- returnBrokenResource(jedis);
- } catch (Exception e) {
- LOGGER.error(e.getMessage(), e);
- } finally {
- returnResource(jedis);
- }
- }
- /**
- * 释放锁
- * @author http://blog.csdn.net/java2000_wl
- * @param billIdentify
- */
- public void unLock(IBillIdentify billIdentify) {
- List<IBillIdentify> list = new ArrayList<IBillIdentify>();
- list.add(billIdentify);
- unLock(list);
- }
- /**
- * 批量获取锁 如果全部获取 立即返回true, 部分获取失败 返回false
- * @author http://blog.csdn.net/java2000_wl
- * @date 2013-7-22 下午10:27:44
- * @param billIdentifyList
- * @return
- */
- public boolean tryLock(List<IBillIdentify> billIdentifyList) {
- return tryLock(billIdentifyList, 0L, null);
- }
- /**
- * 锁在给定的等待时间内空闲,则获取锁成功 返回true, 否则返回false
- * @author http://blog.csdn.net/java2000_wl
- * @param billIdentifyList
- * @param timeout
- * @param unit
- * @return
- */
- public boolean tryLock(List<IBillIdentify> billIdentifyList, long timeout, TimeUnit unit) {
- Jedis jedis = null;
- try {
- List<String> needLocking = new CopyOnWriteArrayList<String>();
- List<String> locked = new CopyOnWriteArrayList<String>();
- jedis = getResource();
- long nano = System.nanoTime();
- do {
- // 构建pipeline,批量提交
- Pipeline pipeline = jedis.pipelined();
- for (IBillIdentify identify : billIdentifyList) {
- String key = (String) identify.uniqueIdentify();
- needLocking.add(key);
- pipeline.setnx(key, key);
- }
- LOGGER.debug("try lock keys: " + needLocking);
- // 提交redis执行计数
- List<Object> results = pipeline.syncAndReturnAll();
- for (int i = 0; i < results.size(); ++i) {
- Long result = (Long) results.get(i);
- String key = needLocking.get(i);
- if (result == 1) { // setnx成功,获得锁
- jedis.expire(key, DEFAULT_BATCH_EXPIRE_TIME);
- locked.add(key);
- }
- }
- needLocking.removeAll(locked); // 已锁定资源去除
- if (CollectionUtils.isEmpty(needLocking)) {
- return true;
- } else {
- // 部分资源未能锁住
- LOGGER.debug("keys: " + needLocking + " locked by another business:");
- }
- if (timeout == 0) {
- break;
- }
- Thread.sleep(500);
- } while ((System.nanoTime() - nano) < unit.toNanos(timeout));
- // 得不到锁,释放锁定的部分对象,并返回失败
- if (!CollectionUtils.isEmpty(locked)) {
- jedis.del(locked.toArray(new String[0]));
- }
- return false;
- } catch (JedisConnectionException je) {
- LOGGER.error(je.getMessage(), je);
- returnBrokenResource(jedis);
- } catch (Exception e) {
- LOGGER.error(e.getMessage(), e);
- } finally {
- returnResource(jedis);
- }
- return true;
- }
- /**
- * 批量释放锁
- * @author http://blog.csdn.net/java2000_wl
- * @param billIdentifyList
- */
- public void unLock(List<IBillIdentify> billIdentifyList) {
- List<String> keys = new CopyOnWriteArrayList<String>();
- for (IBillIdentify identify : billIdentifyList) {
- String key = (String) identify.uniqueIdentify();
- keys.add(key);
- }
- Jedis jedis = null;
- try {
- jedis = getResource();
- jedis.del(keys.toArray(new String[0]));
- LOGGER.debug("release lock, keys :" + keys);
- } catch (JedisConnectionException je) {
- LOGGER.error(je.getMessage(), je);
- returnBrokenResource(jedis);
- } catch (Exception e) {
- LOGGER.error(e.getMessage(), e);
- } finally {
- returnResource(jedis);
- }
- }
- /**
- * @author http://blog.csdn.net/java2000_wl
- * @date 2013-7-22 下午9:33:45
- * @return
- */
- private Jedis getResource() {
- return jedisPool.getResource();
- }
- /**
- * 销毁连接
- * @author http://blog.csdn.net/java2000_wl
- * @param jedis
- */
- private void returnBrokenResource(Jedis jedis) {
- if (jedis == null) {
- return;
- }
- try {
- //容错
- jedisPool.returnBrokenResource(jedis);
- } catch (Exception e) {
- LOGGER.error(e.getMessage(), e);
- }
- }
- /**
- * @author http://blog.csdn.net/java2000_wl
- * @param jedis
- */
- private void returnResource(Jedis jedis) {
- if (jedis == null) {
- return;
- }
- try {
- jedisPool.returnResource(jedis);
- } catch (Exception e) {
- LOGGER.error(e.getMessage(), e);
- }
- }
0 0
- Redis实现分布式锁
- Redis 分布式锁实现
- Redis 分布式锁实现
- Redis实现分布式锁
- redis实现分布式锁
- Redis实现分布式锁
- 分布式锁redis实现
- Redis 分布式锁实现
- redis分布式锁实现
- redis实现分布式锁
- Redis分布式锁实现
- redis分布式锁实现
- redis实现分布式锁
- Redis分布式锁实现
- Redis实现分布式锁
- Redis实现分布式锁
- redis实现分布式锁
- Redis实现分布式锁
- Windows 7下WireShark抓取127.0.0.1(Loopback)报文
- 将Excel数据导入MySQ
- AOJ759会绕圈的数
- 计算机视觉领域期刊
- javaSE第三部分下 面向对象下
- Redis实现分布式锁
- Android studio 正式签名打包
- postfix常用错误解决方案
- Easy Problem VI
- mysql的存储引擎innodb、myisam对插入影响和索引对插入的影响
- HTML--学习笔记第一天
- docker安装的bug(Win10)
- final常量和Scanner输入
- Git使用总结(包含Git Bash和Git GUI的使用)(赞)