Class FlowableDistinctUntilChanged.DistinctUntilChangedSubscriber<T,K>

java.lang.Object
io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber<T,T>
io.reactivex.rxjava3.internal.operators.flowable.FlowableDistinctUntilChanged.DistinctUntilChangedSubscriber<T,K>
All Implemented Interfaces:
FlowableSubscriber<T>, ConditionalSubscriber<T>, QueueFuseable<T>, QueueSubscription<T>, SimpleQueue<T>, org.reactivestreams.Subscriber<T>, org.reactivestreams.Subscription
Enclosing class:
FlowableDistinctUntilChanged<T,K>

static final class FlowableDistinctUntilChanged.DistinctUntilChangedSubscriber<T,K> extends BasicFuseableSubscriber<T,T> implements ConditionalSubscriber<T>
  • Field Details

    • keySelector

      final Function<? super T,K> keySelector
    • comparer

      final BiPredicate<? super K,? super K> comparer
    • last

      K last
    • hasValue

      boolean hasValue
  • Constructor Details

    • DistinctUntilChangedSubscriber

      DistinctUntilChangedSubscriber(org.reactivestreams.Subscriber<? super T> actual, Function<? super T,K> keySelector, BiPredicate<? super K,? super K> comparer)
  • Method Details

    • onNext

      public void onNext(T t)
      Specified by:
      onNext in interface org.reactivestreams.Subscriber<T>
    • tryOnNext

      public boolean tryOnNext(T t)
      Description copied from interface: ConditionalSubscriber
      Conditionally takes the value.
      Specified by:
      tryOnNext in interface ConditionalSubscriber<T>
      Parameters:
      t - the value to deliver
      Returns:
      true if the value has been accepted, false if the value has been rejected and the next value can be sent immediately
    • requestFusion

      public int requestFusion(int mode)
      Description copied from interface: QueueFuseable
      Request a fusion mode from the upstream.

      This should be called before onSubscribe returns.

      Calling this method multiple times or after onSubscribe finished is not allowed and may result in undefined behavior.

      Specified by:
      requestFusion in interface QueueFuseable<T>
      Parameters:
      mode - the requested fusion mode, allowed values are QueueFuseable.SYNC, QueueFuseable.ASYNC, QueueFuseable.ANY combined with QueueFuseable.BOUNDARY (e.g., requestFusion(SYNC | BOUNDARY)).
      Returns:
      the established fusion mode: QueueFuseable.NONE, QueueFuseable.SYNC, QueueFuseable.ASYNC.
    • poll

      @Nullable public T poll() throws Throwable
      Description copied from interface: SimpleQueue
      Tries to dequeue a value (non-null) or returns null if the queue is empty.

      If the producer uses SimpleQueue.offer(Object, Object) and when polling in pairs, if the first poll() returns a non-null item, the second poll() is guaranteed to return a non-null item as well.

      Specified by:
      poll in interface SimpleQueue<T>
      Returns:
      the item or null to indicate an empty queue
      Throws:
      Throwable - if some pre-processing of the dequeued item (usually through fused functions) throws.