Examples of org.apache.curator.framework.recipes.atomic.DistributedAtomicInteger

org.apache.curator.framework.recipes.atomic.DistributedAtomicInteger

A counter that attempts atomic increments. It first tries uses optimistic locking. If that fails, an optional {@link InterProcessMutex} is taken. For both optimistic and mutex, a retry policy is used toretry the increment.

The various increment methods return an {@link AtomicValue} object. You must always check{@link AtomicValue#succeeded()}. None of the methods (other than get()) are guaranteed to succeed.

        return count;
    }


    private int adjustAndGet(String userId, Direction direction) {
        RetryPolicy retryPolicy = new BoundedExponentialBackoffRetry(BASE_SLEEP_TIME_MS, MAX_SLEEP_TIME_MS, MAX_RETRIES);
        DistributedAtomicInteger distributedAtomicInteger = new DistributedAtomicInteger(curatorFramework, counterPath(userId), retryPolicy);


        try {
            distributedAtomicInteger.initialize(0); // this will respect an existing value but set uninitialized values to 0
        } catch (Exception e) {
            throw new LumifyException("failed to initialize counter for " + userId);
        }


        try {
            AtomicValue<Integer> count = direction == Direction.INCREMENT ? distributedAtomicInteger.increment() : distributedAtomicInteger.decrement();
            if (count.succeeded()) {
                return count.postValue();
            } else {
                throw new LumifyException("failed to " + direction + " counter for " + userId);
            }

    this.alphabet = buildAlphabet();
  }


  @Override
  public void start() {
    this.distributedGenerator = new DistributedAtomicInteger(curator, COUNTER_PATH, new RetryOneTime(1));
  }

Examples of org.apache.curator.framework.recipes.atomic.DistributedAtomicInteger

Related Classes of org.apache.curator.framework.recipes.atomic.DistributedAtomicInteger