Class ObservableDistinctUntilChanged.DistinctUntilChangedObserver<T,K>
java.lang.Object
io.reactivex.rxjava3.internal.observers.BasicFuseableObserver<T,T>
io.reactivex.rxjava3.internal.operators.observable.ObservableDistinctUntilChanged.DistinctUntilChangedObserver<T,K>
- All Implemented Interfaces:
Observer<T>
,Disposable
,QueueDisposable<T>
,QueueFuseable<T>
,SimpleQueue<T>
- Enclosing class:
ObservableDistinctUntilChanged<T,
K>
static final class ObservableDistinctUntilChanged.DistinctUntilChangedObserver<T,K>
extends BasicFuseableObserver<T,T>
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Field Summary
FieldsModifier and TypeFieldDescription(package private) final BiPredicate
<? super K, ? super K> (package private) boolean
(package private) K
Fields inherited from class io.reactivex.rxjava3.internal.observers.BasicFuseableObserver
done, downstream, qd, sourceMode, upstream
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Constructor Summary
ConstructorsConstructorDescriptionDistinctUntilChangedObserver
(Observer<? super T> actual, Function<? super T, K> keySelector, BiPredicate<? super K, ? super K> comparer) -
Method Summary
Methods inherited from class io.reactivex.rxjava3.internal.observers.BasicFuseableObserver
afterDownstream, beforeDownstream, clear, dispose, fail, isDisposed, isEmpty, offer, offer, onComplete, onError, onSubscribe, transitiveBoundaryFusion
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Field Details
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keySelector
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comparer
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last
K last -
hasValue
boolean hasValue
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Constructor Details
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DistinctUntilChangedObserver
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Method Details
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onNext
Description copied from interface:Observer
Provides theObserver
with a new item to observe.The
Observable
may call this method 0 or more times.The
Observable
will not call this method again after it calls eitherObserver.onComplete()
orObserver.onError(java.lang.Throwable)
.- Parameters:
t
- the item emitted by the Observable
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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.- Parameters:
mode
- the requested fusion mode, allowed values areQueueFuseable.SYNC
,QueueFuseable.ASYNC
,QueueFuseable.ANY
combined withQueueFuseable.BOUNDARY
(e.g.,requestFusion(SYNC | BOUNDARY)
).- Returns:
- the established fusion mode:
QueueFuseable.NONE
,QueueFuseable.SYNC
,QueueFuseable.ASYNC
.
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poll
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.- 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.
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