并发场景下分布式锁未生效

背景: 接手他人的业务后,生产发现同一个商户入网了两次,明明有分布式锁,但未生效

原因:未对tryLock判断,获取锁失败也能执行业务逻辑

经验值: 不要想的太复杂,先review代码

修改前tryLock

	String lockKey = "custIncr:"+customerBean.getCustomerNo();
		RLock lock = redissonClient.getLock(lockKey);
		boolean tryLock = false;
		try {
			tryLock = lock.tryLock(0L, 30L, TimeUnit.SECONDS);
			//业务逻辑
		} catch (InterruptedException e) {
			logger.error(e.getMessage(), e);
			throw new ServerException("缓存异常，请稍后重试！" );
		}catch (Exception e) {
			logger.error(e.getMessage());
			throw e;
		}finally {
			if (tryLock ) {
				lock.unlock();
			}
		}

修改后

	String lockKey = "custIncr:"+customerBean.getCustomerNo();
		RLock lock = redissonClient.getLock(lockKey);
		boolean tryLock = false;
		try {
			tryLock = lock.tryLock(0L, 30L, TimeUnit.SECONDS);
            if(tryLock){
               //业务逻辑 
            }else{
                 // 未能获取到锁，可以选择等待、重试或执行其他逻辑
            }
			
		} catch (InterruptedException e) {
			logger.error(e.getMessage(), e);
			throw new ServerException("缓存异常，请稍后重试！" );
		}catch (Exception e) {
			logger.error(e.getMessage());
			throw e;
		}finally {
			if (tryLock ) {
				lock.unlock();
			}
		}