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
public class RedissonConfig {
  
  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:

  @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 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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