redission分布式锁 redission分布式锁防止重复初始化问题
黒曼巴 人气:0配置地址:
redisson: # Redis服务地址 如果集群使用","进行分割 server-address: redis://${spring.redis.host}:${spring.redis.port} database: ${spring.redis.database}
创建配置类:
@ConfigurationProperties(prefix = "redisson") @Configuration public class RedissonConfig { /** Redis服务地址 如果集群使用","进行分割 */ private String serverAddress; private Integer database; public String getServerAddress() { return serverAddress; } public void setServerAddress(String serverAddresss) { this.serverAddress = serverAddresss; } public Integer getDatabase() { return database; } public void setDatabase(Integer database) { this.database = database; } }
注册redission Bean:
/** * RedissonClient * @return */ @Bean public RedissonClient redissonClient(){ String splitChar = ","; String serverAddress = redissonConfig.getServerAddress(); String[] serverAddressArr = serverAddress.split(splitChar); Config config = new Config(); if (serverAddressArr.length == 1) { //单例redis config.useSingleServer() .setAddress(redissonConfig.getServerAddress()) .setDatabase(redissonConfig.getDatabase()); } else { //集群redis config.useClusterServers().addNodeAddress(serverAddressArr); } return Redisson.create(config); }
防止重复初始化:
** * 初始化告警统计记录 保证告警统计不会被重复初始化 * * @param areaId 部门id * @throws BizException */ public void initWarningStatisticsSafe(String areaId) throws BizException { //创建锁名称 String lockName = generateInitWarningStatisticsLockName(areaId); RLock lock = redisClient.getLock(lockName); try { //尝试获取锁 (最多尝试10秒,获取到后15秒后释放锁) boolean isAcquireLock = lock.tryLock(10, 15, TimeUnit.SECONDS); if (!isAcquireLock) { logger.error("初始化消息统计 --- 获取锁失败 lockName = " + lockName); throw new BizException("系统异常"); } else { try { //查询【告警统计】 (能够查询到最新的数据,因为默认隔离级别是read committed List<WarningStatisticsPO> warningStatisticsPOS = warningStatisticsDAO.selectByArea(areaId); if (CollectionUtils.isEmpty(warningStatisticsPOS)) { //如果部门不存在告警统计,才进行初始化 initWarningStatistics()会开启一个新事务 warningStatisticsService.initWarningStatistics(areaId); } } finally { //释放锁 (在事务提交后才释放锁。保证其它事务在获取锁后能查询到数据,不会再进行初始化。) lock.unlock(); } } } catch (InterruptedException e) { e.printStackTrace(); } }
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