org.apache.flink.core.testutils

Class OneShotLatch

java.lang.Object

org.apache.flink.core.testutils.OneShotLatch

public final class OneShotLatch
extends Object

Latch for synchronizing parts of code in tests. Once the latch has fired once calls to await() will return immediately in the future.

A part of the code that should only run after other code calls await(). The call will only return once the other part is finished and calls trigger().

Constructor Summary

Constructors

Constructor and Description
OneShotLatch()

Method Summary

Modifier and Type	Method and Description
void	await() Waits until trigger() is called.
void	await(long timeout, TimeUnit timeUnit) Waits until trigger() is called.
int	getWaitersCount()
boolean	isTriggered() Checks if the latch was triggered.
void	reset() Resets the latch so that isTriggered() returns false.
String	toString()
void	trigger() Fires the latch.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

OneShotLatch

public OneShotLatch()

Method Detail

trigger

public void trigger()

Fires the latch. Code that is blocked on await() will now return.

await

public void await()
           throws InterruptedException

Waits until trigger() is called. Once trigger() has been called this call will always return immediately.

Throws:

InterruptedException - Thrown if the thread is interrupted while waiting.

await

public void await(long timeout,
                  TimeUnit timeUnit)
           throws InterruptedException,
                  TimeoutException

Waits until trigger() is called. Once #trigger() has been called this call will always return immediately.

If the latch is not triggered within the given timeout, a TimeoutException will be thrown after the timeout.

A timeout value of zero means infinite timeout and make this equivalent to await().

Parameters:

timeout - The value of the timeout, a value of zero indicating infinite timeout.

timeUnit - The unit of the timeout

Throws:

InterruptedException - Thrown if the thread is interrupted while waiting.

TimeoutException - Thrown, if the latch is not triggered within the timeout time.

isTriggered

public boolean isTriggered()

Checks if the latch was triggered.

Returns:

True, if the latch was triggered, false if not.

getWaitersCount

public int getWaitersCount()

reset

public void reset()

Resets the latch so that isTriggered() returns false.

toString

public String toString()

Overrides:

toString in class Object