redission分布式锁防止重复初始化问题
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 publicclassRedissonConfig{ /**Redis服务地址如果集群使用","进行分割*/ privateStringserverAddress; privateIntegerdatabase; publicStringgetServerAddress(){ returnserverAddress; } publicvoidsetServerAddress(StringserverAddresss){ this.serverAddress=serverAddresss; } publicIntegergetDatabase(){ returndatabase; } publicvoidsetDatabase(Integerdatabase){ this.database=database; } }
注册redissionBean:
/** *RedissonClient *@return */ @Bean publicRedissonClientredissonClient(){ StringsplitChar=","; StringserverAddress=redissonConfig.getServerAddress(); String[]serverAddressArr=serverAddress.split(splitChar); Configconfig=newConfig(); if(serverAddressArr.length==1){ //单例redis config.useSingleServer() .setAddress(redissonConfig.getServerAddress()) .setDatabase(redissonConfig.getDatabase()); }else{ //集群redis config.useClusterServers().addNodeAddress(serverAddressArr); } returnRedisson.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 * *@paramareaId部门id *@throwsBizException */ publicvoidinitWarningStatisticsSafe(StringareaId)throwsBizException{ //创建锁名称 StringlockName=generateInitWarningStatisticsLockName(areaId); RLocklock=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) booleanisAcquireLock=lock.tryLock(10,15,TimeUnit.SECONDS); if(!isAcquireLock){ logger.error("初始化消息统计---获取锁失败lockName="+lockName); thrownewBizException("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readcommitted ListwarningStatisticsPOS=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(InterruptedExceptione){ e.printStackTrace(); } }
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