Interface MaybeObserver<T>
- Type Parameters:
T
- the type of item the MaybeObserver expects to observe
- All Known Implementing Classes:
BlockingDisposableMultiObserver
,BlockingMultiObserver
,CompletionStageConsumer
,DisposableAutoReleaseMultiObserver
,DisposableMaybeObserver
,EmptyComponent
,FlowableConcatMapMaybe.ConcatMapMaybeSubscriber.ConcatMapMaybeObserver
,FlowableConcatWithMaybe.ConcatWithSubscriber
,FlowableFlatMapMaybe.FlatMapMaybeSubscriber.InnerObserver
,FlowableMergeWithMaybe.MergeWithObserver.OtherObserver
,FlowableSwitchMapMaybe.SwitchMapMaybeSubscriber.SwitchMapMaybeObserver
,FutureMultiObserver
,MaterializeSingleObserver
,MaybeAmb.AmbMaybeObserver
,MaybeCache
,MaybeCallbackObserver
,MaybeConcatArray.ConcatMaybeObserver
,MaybeConcatArrayDelayError.ConcatMaybeObserver
,MaybeConcatIterable.ConcatMaybeObserver
,MaybeContains.ContainsMaybeObserver
,MaybeCount.CountMaybeObserver
,MaybeDelay.DelayMaybeObserver
,MaybeDelayOtherPublisher.DelayMaybeObserver
,MaybeDelaySubscriptionOtherPublisher.DelayMaybeObserver
,MaybeDelayWithCompletable.DelayWithMainObserver
,MaybeDematerialize.DematerializeObserver
,MaybeDetach.DetachMaybeObserver
,MaybeDoAfterSuccess.DoAfterObserver
,MaybeDoFinally.DoFinallyObserver
,MaybeDoOnEvent.DoOnEventMaybeObserver
,MaybeDoOnLifecycle.MaybeLifecycleObserver
,MaybeDoOnTerminate.DoOnTerminate
,MaybeEqualSingle.EqualObserver
,MaybeFilter.FilterMaybeObserver
,MaybeFlatMapBiSelector.FlatMapBiMainObserver
,MaybeFlatMapBiSelector.FlatMapBiMainObserver.InnerObserver
,MaybeFlatMapCompletable.FlatMapCompletableObserver
,MaybeFlatMapIterableFlowable.FlatMapIterableObserver
,MaybeFlatMapIterableObservable.FlatMapIterableObserver
,MaybeFlatMapNotification.FlatMapMaybeObserver
,MaybeFlatMapNotification.FlatMapMaybeObserver.InnerObserver
,MaybeFlatMapObservable.FlatMapObserver
,MaybeFlatMapPublisher.FlatMapPublisherSubscriber
,MaybeFlatMapSingle.FlatMapMaybeObserver
,MaybeFlatten.FlatMapMaybeObserver
,MaybeFlatten.FlatMapMaybeObserver.InnerObserver
,MaybeFlattenStreamAsFlowable.FlattenStreamMultiObserver
,MaybeFlattenStreamAsObservable.FlattenStreamMultiObserver
,MaybeHide.HideMaybeObserver
,MaybeIgnoreElement.IgnoreMaybeObserver
,MaybeIgnoreElementCompletable.IgnoreMaybeObserver
,MaybeIsEmpty.IsEmptyMaybeObserver
,MaybeIsEmptySingle.IsEmptyMaybeObserver
,MaybeMap.MapMaybeObserver
,MaybeMapOptional.MapOptionalMaybeObserver
,MaybeMergeArray.MergeMaybeObserver
,MaybeObserveOn.ObserveOnMaybeObserver
,MaybeOnErrorComplete.OnErrorCompleteMultiObserver
,MaybeOnErrorNext.OnErrorNextMaybeObserver
,MaybeOnErrorNext.OnErrorNextMaybeObserver.NextMaybeObserver
,MaybeOnErrorReturn.OnErrorReturnMaybeObserver
,MaybePeek.MaybePeekObserver
,MaybeSubject
,MaybeSubscribeOn.SubscribeOnMaybeObserver
,MaybeSwitchIfEmpty.SwitchIfEmptyMaybeObserver
,MaybeSwitchIfEmpty.SwitchIfEmptyMaybeObserver.OtherMaybeObserver
,MaybeSwitchIfEmptySingle.SwitchIfEmptyMaybeObserver
,MaybeTakeUntilMaybe.TakeUntilMainMaybeObserver
,MaybeTakeUntilMaybe.TakeUntilMainMaybeObserver.TakeUntilOtherMaybeObserver
,MaybeTakeUntilPublisher.TakeUntilMainMaybeObserver
,MaybeTimeInterval.TimeIntervalMaybeObserver
,MaybeTimeoutMaybe.TimeoutFallbackMaybeObserver
,MaybeTimeoutMaybe.TimeoutMainMaybeObserver
,MaybeTimeoutMaybe.TimeoutOtherMaybeObserver
,MaybeTimeoutPublisher.TimeoutFallbackMaybeObserver
,MaybeTimeoutPublisher.TimeoutMainMaybeObserver
,MaybeToFlowable.MaybeToFlowableSubscriber
,MaybeToObservable.MaybeToObservableObserver
,MaybeToSingle.ToSingleMaybeSubscriber
,MaybeUnsubscribeOn.UnsubscribeOnMaybeObserver
,MaybeUsing.UsingObserver
,MaybeZipArray.ZipMaybeObserver
,ObservableConcatMapMaybe.ConcatMapMaybeMainObserver.ConcatMapMaybeObserver
,ObservableConcatWithMaybe.ConcatWithObserver
,ObservableFlatMapMaybe.FlatMapMaybeObserver.InnerObserver
,ObservableMergeWithMaybe.MergeWithObserver.OtherObserver
,ObservableSwitchMapMaybe.SwitchMapMaybeMainObserver.SwitchMapMaybeObserver
,ResourceMaybeObserver
,SafeMaybeObserver
,SingleFlatMapMaybe.FlatMapMaybeObserver
,TestObserver
When a MaybeObserver
is subscribed to a MaybeSource
through the MaybeSource.subscribe(MaybeObserver)
method,
the MaybeSource
calls onSubscribe(Disposable)
with a Disposable
that allows
disposing the sequence at any time. A well-behaved
MaybeSource
will call a MaybeObserver
's onSuccess(Object)
, onError(Throwable)
or onComplete()
method exactly once as they are considered mutually exclusive terminal signals.
Calling the MaybeObserver
's method must happen in a serialized fashion, that is, they must not
be invoked concurrently by multiple threads in an overlapping fashion and the invocation pattern must
adhere to the following protocol:
onSubscribe (onSuccess | onError | onComplete)?
Note that unlike with the Observable
protocol, onComplete()
is not called after the success item has been
signalled via onSuccess(Object)
.
Subscribing a MaybeObserver
to multiple MaybeSource
s is not recommended. If such reuse
happens, it is the duty of the MaybeObserver
implementation to be ready to receive multiple calls to
its methods and ensure proper concurrent behavior of its business logic.
Calling onSubscribe(Disposable)
, onSuccess(Object)
or onError(Throwable)
with a
null
argument is forbidden.
The implementations of the onXXX
methods should avoid throwing runtime exceptions other than the following cases:
- If the argument is
null
, the methods can throw aNullPointerException
. Note though that RxJava preventsnull
s to enter into the flow and thus there is generally no need to check for nulls in flows assembled from standard sources and intermediate operators. - If there is a fatal error (such as
VirtualMachineError
).
- Since:
- 2.0
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionvoid
Called once the deferred computation completes normally.void
Notifies theMaybeObserver
that theMaybe
has experienced an error condition.void
Provides theMaybeObserver
with the means of cancelling (disposing) the connection (channel) with theMaybe
in both synchronous (from withinonSubscribe(Disposable)
itself) and asynchronous manner.void
Notifies theMaybeObserver
with one item and that theMaybe
has finished sending push-based notifications.
-
Method Details
-
onSubscribe
Provides theMaybeObserver
with the means of cancelling (disposing) the connection (channel) with theMaybe
in both synchronous (from withinonSubscribe(Disposable)
itself) and asynchronous manner.- Parameters:
d
- theDisposable
instance whoseDisposable.dispose()
can be called anytime to cancel the connection
-
onSuccess
Notifies theMaybeObserver
with one item and that theMaybe
has finished sending push-based notifications.The
Maybe
will not call this method if it callsonError(java.lang.Throwable)
.- Parameters:
t
- the item emitted by theMaybe
-
onError
Notifies theMaybeObserver
that theMaybe
has experienced an error condition.If the
Maybe
calls this method, it will not thereafter callonSuccess(T)
.- Parameters:
e
- the exception encountered by theMaybe
-
onComplete
void onComplete()Called once the deferred computation completes normally.
-