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Préférences
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JavaTM 2 Platform Std. Ed. v1.6.0
java.util.concurrent
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Constructor Summary | |
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CyclicBarrier(int parties)
Creates a new CyclicBarrier that will trip when the given number of parties (threads) are waiting upon it, and does not perform a predefined action when the barrier is tripped. |
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CyclicBarrier(int parties,
Runnable barrierAction)
Creates a new CyclicBarrier that will trip when the given number of parties (threads) are waiting upon it, and which will execute the given barrier action when the barrier is tripped, performed by the last thread entering the barrier. |
Method Summary | |
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int |
await()
Waits until all parties have invoked await on this barrier. |
int |
await(long timeout,
TimeUnit unit)
Waits until all parties have invoked await on this barrier, or the specified waiting time elapses. |
int |
getNumberWaiting()
Returns the number of parties currently waiting at the barrier. |
int |
getParties()
Returns the number of parties required to trip this barrier. |
boolean |
isBroken()
Queries if this barrier is in a broken state. |
void |
reset()
Resets the barrier to its initial state. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CyclicBarrier(int parties, Runnable barrierAction)
parties
- the number of threads that must invoke await()
before the barrier is trippedbarrierAction
- the command to execute when the barrier is
tripped, or null
if there is no action
IllegalArgumentException
- if parties
is less than 1public CyclicBarrier(int parties)
parties
- the number of threads that must invoke await()
before the barrier is tripped
IllegalArgumentException
- if parties
is less than 1Method Detail |
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public int getParties()
public int await() throws InterruptedException, BrokenBarrierException
If the current thread is not the last to arrive then it is disabled for thread scheduling purposes and lies dormant until one of the following things happens:
reset()
on this barrier.
If the current thread:
InterruptedException
is thrown and the current thread's
interrupted status is cleared.
If the barrier is reset()
while any thread is waiting,
or if the barrier is broken when
await is invoked, or while any thread is waiting, then
BrokenBarrierException
is thrown.
If any thread is interrupted while waiting,
then all other waiting threads will throw
BrokenBarrierException
and the barrier is placed in the broken
state.
If the current thread is the last thread to arrive, and a non-null barrier action was supplied in the constructor, then the current thread runs the action before allowing the other threads to continue. If an exception occurs during the barrier action then that exception will be propagated in the current thread and the barrier is placed in the broken state.
getParties()
- 1 indicates the first
to arrive and zero indicates the last to arrive
InterruptedException
- if the current thread was interrupted
while waiting
BrokenBarrierException
- if another thread was
interrupted or timed out while the current thread was
waiting, or the barrier was reset, or the barrier was
broken when await
was called, or the barrier
action (if present) failed due an exception.public int await(long timeout, TimeUnit unit) throws InterruptedException, BrokenBarrierException, TimeoutException
If the current thread is not the last to arrive then it is disabled for thread scheduling purposes and lies dormant until one of the following things happens:
reset()
on this barrier.
If the current thread:
InterruptedException
is thrown and the current thread's
interrupted status is cleared.
If the specified waiting time elapses then TimeoutException
is thrown. If the time is less than or equal to zero, the
method will not wait at all.
If the barrier is reset()
while any thread is waiting,
or if the barrier is broken when
await is invoked, or while any thread is waiting, then
BrokenBarrierException
is thrown.
If any thread is interrupted while
waiting, then all other waiting threads will throw BrokenBarrierException
and the barrier is placed in the broken
state.
If the current thread is the last thread to arrive, and a non-null barrier action was supplied in the constructor, then the current thread runs the action before allowing the other threads to continue. If an exception occurs during the barrier action then that exception will be propagated in the current thread and the barrier is placed in the broken state.
timeout
- the time to wait for the barrierunit
- the time unit of the timeout parameter
getParties()
- 1 indicates the first
to arrive and zero indicates the last to arrive
InterruptedException
- if the current thread was interrupted
while waiting
TimeoutException
- if the specified timeout elapses
BrokenBarrierException
- if another thread was
interrupted or timed out while the current thread was
waiting, or the barrier was reset, or the barrier was broken
when await
was called, or the barrier action (if
present) failed due an exceptionpublic boolean isBroken()
true
if one or more parties broke out of this
barrier due to interruption or timeout since
construction or the last reset, or a barrier action
failed due to an exception; false
otherwise.public void reset()
BrokenBarrierException
. Note that resets after
a breakage has occurred for other reasons can be complicated to
carry out; threads need to re-synchronize in some other way,
and choose one to perform the reset. It may be preferable to
instead create a new barrier for subsequent use.
public int getNumberWaiting()
await()