Field Detail

• private final ResizeableCountDownLatch.Sync sync

Constructor Detail

• ResizeableCountDownLatch()

Method Detail

• public java.lang.Object ResizeableCountDownLatch(int count)

  Constructs a CountDownLatch initialized with the given count.

  throws:

  IllegalArgumentException if count is negative

  Parameters:

  count - the number of times countDown must be invoked before threads can pass through await

• public boolean attemptToCountDownAndAwait(long timeout)

  Attempts to atomically count down the latch and await release with a timeout. If the timeout expires, the count is increased and the latch is re-tested before reporting failed timeout.

  throws:

  InterruptedException If the thread gets interrupted while waiting for the release

  Returns:

  True, if successful, false, is the timeout elapses without the latch being released

  Parameters:

  timeout - The time in nanoseconds to await

• public void await()

  Causes the current thread to wait until the latch has counted down to zero, unless the thread is {

  linkplain:

  Thread#interrupt interrupted}.

  If the current count is zero then this method returns immediately.

  If the current count is greater than zero then the current thread becomes disabled for thread scheduling purposes and lies dormant until one of two things happen:

  • The count reaches zero due to invocations of the countDown method; or
  • Some other thread {@linkplain Thread#interrupt interrupts} the current thread.

  If the current thread:

  • has its interrupted status set on entry to this method; or
  • is {@linkplain Thread#interrupt interrupted} while waiting,

  then java.lang.InterruptedException is thrown and the current thread's interrupted status is cleared.

  throws:

  InterruptedException if the current thread is interrupted while waiting

• public boolean await(long timeout, java.util.concurrent.TimeUnit unit)

  Causes the current thread to wait until the latch has counted down to zero, unless the thread is {

  linkplain:

  Thread#interrupt interrupted}, or the specified waiting time elapses.

  If the current count is zero then this method returns immediately with the value true.

  If the current count is greater than zero then the current thread becomes disabled for thread scheduling purposes and lies dormant until one of three things happen:

  • The count reaches zero due to invocations of the countDown method; or
  • Some other thread {@linkplain Thread#interrupt interrupts} the current thread; or
  • The specified waiting time elapses.

  If the count reaches zero then the method returns with the value true.

  If the current thread:

  • has its interrupted status set on entry to this method; or
  • is {@linkplain Thread#interrupt interrupted} while waiting,

  then java.lang.InterruptedException is thrown and the current thread's interrupted status is cleared.

  If the specified waiting time elapses then the value false is returned. If the time is less than or equal to zero, the method will not wait at all.

  throws:

  InterruptedException if the current thread is interrupted while waiting

  Returns:

  true if the count reached zero and false if the waiting time elapsed before the count reached zero

  Parameters:

  timeout - the maximum time to wait

  unit - the time unit of the timeout argument

• public void countDown()

  Decrements the count of the latch, releasing all waiting threads 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 threads are re-enabled for thread scheduling purposes.

  If the current count equals zero then nothing happens.

• public void decreaseCount()

• public long getCount()

  Returns the current count.

  This method is typically used for debugging and testing purposes.

  Returns:

  the current count

• public void increaseCount()

• public boolean isReleasedFlag()

• public java.lang.String toString()

  Returns a string identifying this latch, as well as its state. The state, in brackets, includes the String "Count =" followed by the current count.

  Returns:

  a string identifying this latch, as well as its state