Class PhasedBackoffWaitStrategy

  • All Implemented Interfaces:
    WaitStrategy

    public final class PhasedBackoffWaitStrategy
    extends Object
    implements WaitStrategy

    Phased wait strategy for waiting EventProcessors on a barrier.

    This strategy can be used when throughput and low-latency are not as important as CPU resource. Spins, then yields, then waits using the configured fallback WaitStrategy.

    • Constructor Detail

      • PhasedBackoffWaitStrategy

        public PhasedBackoffWaitStrategy​(long spinTimeout,
                                         long yieldTimeout,
                                         TimeUnit units,
                                         WaitStrategy fallbackStrategy)
    • Method Detail

      • waitFor

        public long waitFor​(long sequence,
                            Sequence cursor,
                            Sequence dependentSequence,
                            SequenceBarrier barrier)
                     throws AlertException,
                            InterruptedException,
                            TimeoutException
        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.
        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.
        Returns:
        the sequence that is available which may be greater than the requested sequence.
        Throws:
        AlertException - if the status of the Disruptor has changed.
        InterruptedException - if the thread is interrupted.
        TimeoutException