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## java.util.concurrent.locks
Class AbstractQueuedSynchronizer.ConditionObject

    java.lang.Object
      java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject

All Implemented Interfaces:
  Serializable, Condition

Enclosing class:
  AbstractQueuedSynchronizer

    public class AbstractQueuedSynchronizer.ConditionObject

extends Object
implements Condition, Serializable

Condition implementation for a `AbstractQueuedSynchronizer` serving as the basis of a `Lock` implementation.

Method documentation for this class describes mechanics, not behavioral specifications from the point of view of Lock and Condition users. Exported versions of this class will in general need to be accompanied by documentation describing condition semantics that rely on those of the associated `AbstractQueuedSynchronizer`.

This class is Serializable, but all fields are transient, so deserialized conditions have no waiters.

See Also:
  Serialized Form

Constructor Summary
`AbstractQueuedSynchronizer.ConditionObject()` Creates a new `ConditionObject` instance.

Method Summary
`void` | `await()` Implements interruptible condition wait.
`boolean` | `await(long time, TimeUnit unit)` Implements timed condition wait.
`long` | `awaitNanos(long nanosTimeout)` Implements timed condition wait.
`void` | `awaitUninterruptibly()` Implements uninterruptible condition wait.
`boolean` | `awaitUntil(Date deadline)` Implements absolute timed condition wait.
`protected Collection<Thread>` | `getWaitingThreads()` Returns a collection containing those threads that may be waiting on this Condition.
`protected int` | `getWaitQueueLength()` Returns an estimate of the number of threads waiting on this condition.
`protected boolean` | `hasWaiters()` Queries whether any threads are waiting on this condition.
`void` | `signal()` Moves the longest-waiting thread, if one exists, from the wait queue for this condition to the wait queue for the owning lock.
`void` | `signalAll()` Moves all threads from the wait queue for this condition to the wait queue for the owning lock.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### AbstractQueuedSynchronizer.ConditionObject

    public AbstractQueuedSynchronizer.ConditionObject()

  Creates a new `ConditionObject` instance.

Method Detail

### signal

    public final void signal()

  Moves the longest-waiting thread, if one exists, from the wait queue for this condition to the wait queue for the owning lock.

  Specified by:
    `signal` in interface `Condition`
  Throws:
    `IllegalMonitorStateException` - if `AbstractQueuedSynchronizer.isHeldExclusively()` returns `false`

### signalAll

    public final void signalAll()

  Moves all threads from the wait queue for this condition to the wait queue for the owning lock.

  Specified by:
    `signalAll` in interface `Condition`
  Throws:
    `IllegalMonitorStateException` - if `AbstractQueuedSynchronizer.isHeldExclusively()` returns `false`

### awaitUninterruptibly

    public final void awaitUninterruptibly()

  Implements uninterruptible condition wait.
  1. Save lock state returned by `AbstractQueuedSynchronizer.getState()`
  2. Invoke `AbstractQueuedSynchronizer.release(int)` with saved state as argument, throwing IllegalMonitorStateException if it fails.
  3. Block until signalled
  4. Reacquire by invoking specialized version of `AbstractQueuedSynchronizer.acquire(int)` with saved state as argument.

  Specified by:
    `awaitUninterruptibly` in interface `Condition`

### await

    public final void await()
                     throws InterruptedException

  Implements interruptible condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by `AbstractQueuedSynchronizer.getState()`
  3. Invoke `AbstractQueuedSynchronizer.release(int)` with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled or interrupted
  5. Reacquire by invoking specialized version of `AbstractQueuedSynchronizer.acquire(int)` with saved state as argument.
  6. If interrupted while blocked in step 4, throw exception

  Specified by:
    `await` in interface `Condition`
  Throws:
    `InterruptedException` - if the current thread is interrupted (and interruption of thread suspension is supported)

### awaitNanos

    public final long awaitNanos(long nanosTimeout)
                          throws InterruptedException

  Implements timed condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by `AbstractQueuedSynchronizer.getState()`
  3. Invoke `AbstractQueuedSynchronizer.release(int)` with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled, interrupted, or timed out
  5. Reacquire by invoking specialized version of `AbstractQueuedSynchronizer.acquire(int)` with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException

  Specified by:
    `awaitNanos` in interface `Condition`
  Parameters:
    `nanosTimeout` - the maximum time to wait, in nanoseconds
  Returns:
    an estimate of the `nanosTimeout` value minus the time spent waiting upon return from this method. A positive value may be used as the argument to a subsequent call to this method to finish waiting out the desired time. A value less than or equal to zero indicates that no time remains.
  Throws:
    `InterruptedException` - if the current thread is interrupted (and interruption of thread suspension is supported)

### awaitUntil

    public final boolean awaitUntil(Date deadline)
                             throws InterruptedException

  Implements absolute timed condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by `AbstractQueuedSynchronizer.getState()`
  3. Invoke `AbstractQueuedSynchronizer.release(int)` with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled, interrupted, or timed out
  5. Reacquire by invoking specialized version of `AbstractQueuedSynchronizer.acquire(int)` with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException
  7. If timed out while blocked in step 4, return false, else true

  Specified by:
    `awaitUntil` in interface `Condition`
  Parameters:
    `deadline` - the absolute time to wait until
  Returns:
    `false` if the deadline has elapsed upon return, else `true`
  Throws:
    `InterruptedException` - if the current thread is interrupted (and interruption of thread suspension is supported)

### await

    public final boolean await(long time,
                               TimeUnit unit)
                        throws InterruptedException

  Implements timed condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by `AbstractQueuedSynchronizer.getState()`
  3. Invoke `AbstractQueuedSynchronizer.release(int)` with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled, interrupted, or timed out
  5. Reacquire by invoking specialized version of `AbstractQueuedSynchronizer.acquire(int)` with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException
  7. If timed out while blocked in step 4, return false, else true

  Specified by:
    `await` in interface `Condition`
  Parameters:
    `time` - the maximum time to wait
    `unit` - the time unit of the `time` argument
  Returns:
    `false` if the waiting time detectably elapsed before return from the method, else `true`
  Throws:
    `InterruptedException` - if the current thread is interrupted (and interruption of thread suspension is supported)

### hasWaiters

    protected final boolean hasWaiters()

  Queries whether any threads are waiting on this condition. Implements `AbstractQueuedSynchronizer.hasWaiters(java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject)`.

  Returns:
    `true` if there are any waiting threads
  Throws:
    `IllegalMonitorStateException` - if `AbstractQueuedSynchronizer.isHeldExclusively()` returns `false`

### getWaitQueueLength

    protected final int getWaitQueueLength()

  Returns an estimate of the number of threads waiting on this condition. Implements `AbstractQueuedSynchronizer.getWaitQueueLength(java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject)`.

  Returns:
    the estimated number of waiting threads
  Throws:
    `IllegalMonitorStateException` - if `AbstractQueuedSynchronizer.isHeldExclusively()` returns `false`

### getWaitingThreads

    protected final Collection<Thread> getWaitingThreads()

  Returns a collection containing those threads that may be waiting on this Condition. Implements `AbstractQueuedSynchronizer.getWaitingThreads(java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject)`.

  Returns:
    the collection of threads
  Throws:
    `IllegalMonitorStateException` - if `AbstractQueuedSynchronizer.isHeldExclusively()` returns `false`

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