Package rx.internal.util.unsafe
Interface QueueProgressIndicators
- All Known Implementing Classes:
SpscUnboundedArrayQueue
public interface QueueProgressIndicators
This interface is provided for monitoring purposes only and is only available on queues where it is easy to
provide it. The producer/consumer progress indicators usually correspond with the number of elements
offered/polled, but they are not guaranteed to maintain that semantic.
-
Method Summary
Modifier and TypeMethodDescriptionlong
This method has no concurrent visibility semantics.long
This method has no concurrent visibility semantics.
-
Method Details
-
currentProducerIndex
long currentProducerIndex()This method has no concurrent visibility semantics. The value returned may be negative. Under normal circumstances 2 consecutive calls to this method can offer an idea of progress made by producer threads by subtracting the 2 results though in extreme cases (if producers have progressed by more than 2^64) this may also fail.
This value will normally indicate number of elements passed into the queue, but may under some circumstances be a derivative of that figure. This method should not be used to derive size or emptiness.- Returns:
- the current value of the producer progress index
-
currentConsumerIndex
long currentConsumerIndex()This method has no concurrent visibility semantics. The value returned may be negative. Under normal circumstances 2 consecutive calls to this method can offer an idea of progress made by consumer threads by subtracting the 2 results though in extreme cases (if consumers have progressed by more than 2^64) this may also fail.
This value will normally indicate number of elements taken out of the queue, but may under some circumstances be a derivative of that figure. This method should not be used to derive size or emptiness.- Returns:
- the current value of the consumer progress index
-