Class AbstractQueuedLongSynchronizer.ConditionObject

java.lang.Object
- java.util.concurrent.locks.AbstractQueuedLongSynchronizer.ConditionObject

All Implemented Interfaces:: Serializable, Condition

Enclosing class:: AbstractQueuedLongSynchronizer

public class AbstractQueuedLongSynchronizer.ConditionObject
extends Object
implements Condition, Serializable

Condition implementation for a AbstractQueuedLongSynchronizer 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 AbstractQueuedLongSynchronizer.

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

Since:: 1.6
See Also:: Serialized Form

Constructor Summary

Constructors
Constructor	Description
`ConditionObject()`	Creates a new `ConditionObject` instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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 declared in class java.lang.Object

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

Constructor Detail

ConditionObject

public 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 AbstractQueuedLongSynchronizer.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 AbstractQueuedLongSynchronizer.isHeldExclusively() returns false

awaitUninterruptibly

public final void awaitUninterruptibly()

Implements uninterruptible condition wait.

Save lock state returned by AbstractQueuedLongSynchronizer.getState().
Invoke AbstractQueuedLongSynchronizer.release(long) with saved state as argument, throwing IllegalMonitorStateException if it fails.
Block until signalled.
Reacquire by invoking specialized version of AbstractQueuedLongSynchronizer.acquire(long) with saved state as argument.

Specified by:: awaitUninterruptibly in interface Condition

await

public final void await()
                 throws InterruptedException

Implements interruptible condition wait.

If current thread is interrupted, throw InterruptedException.
Save lock state returned by AbstractQueuedLongSynchronizer.getState().
Invoke AbstractQueuedLongSynchronizer.release(long) with saved state as argument, throwing IllegalMonitorStateException if it fails.
Block until signalled or interrupted.
Reacquire by invoking specialized version of AbstractQueuedLongSynchronizer.acquire(long) with saved state as argument.
If interrupted while blocked in step 4, throw InterruptedException.

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.

If current thread is interrupted, throw InterruptedException.
Save lock state returned by AbstractQueuedLongSynchronizer.getState().
Invoke AbstractQueuedLongSynchronizer.release(long) with saved state as argument, throwing IllegalMonitorStateException if it fails.
Block until signalled, interrupted, or timed out.
Reacquire by invoking specialized version of AbstractQueuedLongSynchronizer.acquire(long) with saved state as argument.
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.

If current thread is interrupted, throw InterruptedException.
Save lock state returned by AbstractQueuedLongSynchronizer.getState().
Invoke AbstractQueuedLongSynchronizer.release(long) with saved state as argument, throwing IllegalMonitorStateException if it fails.
Block until signalled, interrupted, or timed out.
Reacquire by invoking specialized version of AbstractQueuedLongSynchronizer.acquire(long) with saved state as argument.
If interrupted while blocked in step 4, throw InterruptedException.
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.

If current thread is interrupted, throw InterruptedException.
Save lock state returned by AbstractQueuedLongSynchronizer.getState().
Invoke AbstractQueuedLongSynchronizer.release(long) with saved state as argument, throwing IllegalMonitorStateException if it fails.
Block until signalled, interrupted, or timed out.
Reacquire by invoking specialized version of AbstractQueuedLongSynchronizer.acquire(long) with saved state as argument.
If interrupted while blocked in step 4, throw InterruptedException.
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 AbstractQueuedLongSynchronizer.hasWaiters(ConditionObject).

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

getWaitQueueLength

protected final int getWaitQueueLength()

Returns an estimate of the number of threads waiting on this condition. Implements AbstractQueuedLongSynchronizer.getWaitQueueLength(ConditionObject).

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

getWaitingThreads

protected final Collection<Thread> getWaitingThreads()

Returns a collection containing those threads that may be waiting on this Condition. Implements AbstractQueuedLongSynchronizer.getWaitingThreads(ConditionObject).

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