com.alipay.disruptor

类 SleepingWaitStrategy

java.lang.Object

com.alipay.disruptor.SleepingWaitStrategy

所有已实现的接口:

WaitStrategy

public final class SleepingWaitStrategy
extends Object
implements WaitStrategy

Sleeping strategy that initially spins, then uses a Thread.yield(), and eventually sleep (LockSupport.parkNanos(1)) for the minimum number of nanos the OS and JVM will allow while the EventProcessors are waiting on a barrier.

This strategy is a good compromise between performance and CPU resource. Latency spikes can occur after quiet periods.

构造器概要

构造器

构造器和说明
SleepingWaitStrategy()
SleepingWaitStrategy(int retries)

方法概要

方法

限定符和类型	方法和说明
void	signalAllWhenBlocking() Implementations should signal the waiting EventProcessors that the cursor has advanced.
long	waitFor(long sequence, Sequence cursor, Sequence dependentSequence, SequenceBarrier barrier) Wait for the given sequence to be available.

从类继承的方法 java.lang.Object

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

构造器详细资料

SleepingWaitStrategy

public SleepingWaitStrategy()

SleepingWaitStrategy

public SleepingWaitStrategy(int retries)

方法详细资料

waitFor

public long waitFor(long sequence,
           Sequence cursor,
           Sequence dependentSequence,
           SequenceBarrier barrier)
             throws AlertException,
                    InterruptedException

从接口复制的说明: WaitStrategy

Wait for the given sequence to be available. It is possible for this method to return a value less than the sequence number supplied depending on the implementation of the WaitStrategy. A common use for this is to signal a timeout. Any EventProcessor that is using a WaitStrategy to get notifications about message becoming available should remember to handle this case. The BatchEventProcessor explicitly handles this case and will signal a timeout if required.

指定者:

waitFor 在接口中 WaitStrategy

参数:

sequence - to be waited on.

cursor - the main sequence from ringbuffer. Wait/notify strategies will need this as it's the only sequence that is also notified upon update.

dependentSequence - on which to wait.

barrier - the processor is waiting on.

返回:

the sequence that is available which may be greater than the requested sequence.

抛出:

AlertException - if the status of the Disruptor has changed.

InterruptedException - if the thread is interrupted.

signalAllWhenBlocking

public void signalAllWhenBlocking()

从接口复制的说明: WaitStrategy

Implementations should signal the waiting EventProcessors that the cursor has advanced.

指定者:

signalAllWhenBlocking 在接口中 WaitStrategy