com.lmax.disruptor

Class BlockingWaitStrategy

java.lang.Object

com.lmax.disruptor.BlockingWaitStrategy

All Implemented Interfaces:

WaitStrategy

public final class BlockingWaitStrategy
extends java.lang.Object
implements WaitStrategy

Blocking strategy that uses a lock and condition variable for EventProcessors waiting on a barrier.

This strategy can be used when throughput and low-latency are not as important as CPU resource.

Constructor Summary

Constructors

Constructor and Description
BlockingWaitStrategy()

Method Summary

Modifier and Type	Method and Description
void	signalAllWhenBlocking() Implementations should signal the waiting EventProcessors that the cursor has advanced.
java.lang.String	toString()
long	waitFor(long sequence, Sequence cursorSequence, Sequence dependentSequence, SequenceBarrier barrier) Wait for the given sequence to be available.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

BlockingWaitStrategy

public BlockingWaitStrategy()

Method Detail

waitFor

public long waitFor(long sequence,
                    Sequence cursorSequence,
                    Sequence dependentSequence,
                    SequenceBarrier barrier)
             throws AlertException,
                    java.lang.InterruptedException

Description copied from interface: 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.

Specified by:

waitFor in interface WaitStrategy

Parameters:

sequence - to be waited on.

cursorSequence - 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.

Returns:

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

Throws:

AlertException - if the status of the Disruptor has changed.

java.lang.InterruptedException - if the thread is interrupted.

signalAllWhenBlocking

public void signalAllWhenBlocking()

Description copied from interface: WaitStrategy

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

Specified by:

signalAllWhenBlocking in interface WaitStrategy

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object