Class BusySpinWaitStrategy

java.lang.Object
com.lmax.disruptor.BusySpinWaitStrategy
All Implemented Interfaces:
WaitStrategy

public final class BusySpinWaitStrategy extends Object implements WaitStrategy
Busy Spin strategy that uses a busy spin loop for EventProcessors waiting on a barrier.

This strategy will use CPU resource to avoid syscalls which can introduce latency jitter. It is best used when threads can be bound to specific CPU cores.

  • Constructor Details

    • BusySpinWaitStrategy

      public BusySpinWaitStrategy()
  • Method Details

    • waitFor

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