A distributed, concurrent countdown latch data structure.
ICountDownLatch is a cluster-wide synchronization aid that allows one or more callers to wait until a set of operations being performed in other callers completes.
ICountDownLatch count can be reset using
trySetCount() method after
a countdown has finished but not during an active count. This allows
the same latch instance to be reused.
There is no
await() method to do an unbound wait since this is undesirable
in a distributed application: for example, a cluster can split or the master
and replicas could all die. In most cases, it is best to configure
an explicit timeout so you have the ability to deal with these situations.
All of the API methods in the ICountDownLatch offer the exactly-once
execution semantics. For instance, even if a
countDown() call is
internally retried because of crashed Hazelcast member, the counter
value is decremented only once.
Causes the call to wait until the latch has counted down to zero, or an exception is thrown, or the specified waiting time elapses.
If the current count is zero then the promise resolves immediately
with the value
If the current count is greater than zero, then the promise is fulfilled only when one of the following things happen:
If the count reaches zero, then the method returns with the
timeout in milliseconds to wait for the count to reach zero; if the timeout is less than or equal to zero, the method will not wait at all
true if the count reached zero,
false if the waiting
time elapsed before the count reached zero
Decrements the count of the latch, releasing all waiting calls if the count reaches zero.
If the current count is greater than zero, then it is decremented.
If the new count is zero, then all waiting callers are notified
and can proceed, and the countdown owner is set to
If the current count equals zero, then nothing happens.
Destroys this object cluster-wide. Clears all resources taken for this object.
Returns the current count.
the current count
Returns the unique name of this object.
Returns the key of the partition that this DistributedObject is assigned to.
For a partitioned data structure, the returned value will not be
Returns the service name for this object.
Sets the count to the given value if the current count is zero.
If count is not zero, then this method does nothing and returns
the number of times
countDown() must be invoked
before callers can pass through
true if the new count was set,
false if the current
count is not zero
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