Top Description Inners Fields Constructors Methods
reactor.core.publisher

pack-priv final Class FluxDefaultIfEmpty<T>

extends InternalFluxOperator<T, T>
Class Inheritance
Type Parameters
<T>
the value type
Imports
java.util.Objects, java.util.concurrent.atomic.AtomicReferenceFieldUpdater, reactor.core.CoreSubscriber, reactor.util.annotation.Nullable
Emits a scalar value if the source sequence turns out to be empty.
See Also
Reactive-Streams-Commons

Nested and Inner Type Summary

Modifier and TypeClass and Description
pack-priv static class
FluxDefaultIfEmpty.DefaultIfEmptySubscriber<T>

Field Summary

Modifier and TypeField and Description
pack-priv final T
value

Inherited from reactor.core.publisher.InternalFluxOperator:
optimizableOperator

Constructor Summary

AccessConstructor and Description
pack-priv
FluxDefaultIfEmpty(Flux<? extends T> source, T value)

Method Summary

Modifier and TypeMethod and Description
public Object
scanUnsafe(Scannable.Attr<T>
a Attr to resolve for the component.
key)

Overrides reactor.core.publisher.InternalFluxOperator.scanUnsafe.

Implements reactor.core.Scannable.scanUnsafe.

This method is used internally by components to define their key-value mappings in a single place.
public CoreSubscriber<? super T>
subscribeOrReturn(CoreSubscriber<? super T> actual)

Implements abstract reactor.core.publisher.InternalFluxOperator.subscribeOrReturn.

Implements reactor.core.publisher.OptimizableOperator.subscribeOrReturn.

Allow delegation of the subscription by returning a CoreSubscriber, or force subscription encapsulation by returning null.
Inherited from reactor.core.publisher.InternalFluxOperator:
nextOptimizableSourcesourcesubscribe

Field Detail

valueback to summary
pack-priv final T value

Constructor Detail

FluxDefaultIfEmptyback to summary
pack-priv FluxDefaultIfEmpty(Flux<? extends T> source, T value)

Method Detail

scanUnsafeback to summary
public Object scanUnsafe(Scannable.Attr<T> key)

Overrides reactor.core.publisher.InternalFluxOperator.scanUnsafe.

Implements reactor.core.Scannable.scanUnsafe.

Doc from reactor.core.Scannable.scanUnsafe.

This method is used internally by components to define their key-value mappings in a single place. Although it is ignoring the generic type of the Attr key, implementors should take care to return values of the correct type, and return null if no specific value is available.

For public consumption of attributes, prefer using scan(Attr), which will return a typed value and fall back to the key's default if the component didn't define any mapping.

Parameters
key:Scannable.Attr<T>

a Attr to resolve for the component.

Returns:Object

the value associated to the key for that specific component, or null if none.

Annotations
@Override
subscribeOrReturnback to summary
public CoreSubscriber<? super T> subscribeOrReturn(CoreSubscriber<? super T> actual)

Implements abstract reactor.core.publisher.InternalFluxOperator.subscribeOrReturn.

Implements reactor.core.publisher.OptimizableOperator.subscribeOrReturn.

Doc from reactor.core.publisher.OptimizableOperator.subscribeOrReturn.

Allow delegation of the subscription by returning a CoreSubscriber, or force subscription encapsulation by returning null. This can be used in conjunction with nextOptimizableSource() to perform subscription in a loop instead of by recursion.

Returns:CoreSubscriber<? super T>

next CoreSubscriber or "null" if the subscription was already done inside the method

Annotations
@Override
reactor.core.publisher back to summary

pack-priv final Class FluxDefaultIfEmpty.DefaultIfEmptySubscriber<T>

extends Operators.BaseFluxToMonoOperator<T, T>
Class Inheritance

Field Summary

Modifier and TypeField and Description
pack-priv boolean
done

pack-priv static final AtomicReferenceFieldUpdater<FluxDefaultIfEmpty.DefaultIfEmptySubscriber<T>, Object>
FALLBACK_VALUE

pack-priv volatile T
fallbackValue

pack-priv boolean
hasValue

Inherited from reactor.core.publisher.Operators.BaseFluxToMonoOperator:
actualhasRequestsstateSTATE

Constructor Summary

AccessConstructor and Description
pack-priv
DefaultIfEmptySubscriber(CoreSubscriber<? super T> actual, T fallbackValue)

Method Summary

Modifier and TypeMethod and Description
pack-priv T
accumulatedValue()

Implements abstract reactor.core.publisher.Operators.BaseFluxToMonoOperator.accumulatedValue.

This method is being called either during onComplete invocation in case request has happened before, or during request invocation in case onComplete with no values has happened before.
public void
cancel()

Overrides reactor.core.publisher.Operators.BaseFluxToMonoOperator.cancel.

Implements org.reactivestreams.Subscription.cancel.

Request the Publisher to stop sending data and clean up resources.
public void
onComplete()

Implements org.reactivestreams.Subscriber.onComplete.

Successful terminal state.
public void
onError(Throwable
the throwable signaled
t)

Implements org.reactivestreams.Subscriber.onError.

Failed terminal state.
public void
onNext(T
the element signaled
t)

Implements org.reactivestreams.Subscriber.onNext.

Data notification sent by the Publisher in response to requests to Subscription#request(long).
public void
request(long
the strictly positive number of elements to requests to the upstream Publisher
n)

Overrides reactor.core.publisher.Operators.BaseFluxToMonoOperator.request.

Implements org.reactivestreams.Subscription.request.

No events will be sent by a Publisher until demand is signaled via this method.
public Object
scanUnsafe(Scannable.Attr<T>
a Attr to resolve for the component.
key)

Overrides reactor.core.publisher.Operators.BaseFluxToMonoOperator.scanUnsafe.

Overrides default reactor.core.publisher.InnerProducer.scanUnsafe.

Implements reactor.core.Scannable.scanUnsafe.

This method is used internally by components to define their key-value mappings in a single place.
Inherited from reactor.core.publisher.Operators.BaseFluxToMonoOperator:
actualclearcompletePossiblyEmptyisEmptyonSubscribepollrequestFusionsize

Field Detail

doneback to summary
pack-priv boolean done
FALLBACK_VALUEback to summary
pack-priv static final AtomicReferenceFieldUpdater<FluxDefaultIfEmpty.DefaultIfEmptySubscriber<T>, Object> FALLBACK_VALUE
Annotations
@SuppressWarnings:rawtypes
fallbackValueback to summary
pack-priv volatile T fallbackValue
hasValueback to summary
pack-priv boolean hasValue

Constructor Detail

DefaultIfEmptySubscriberback to summary
pack-priv DefaultIfEmptySubscriber(CoreSubscriber<? super T> actual, T fallbackValue)

Method Detail

accumulatedValueback to summary
pack-priv T accumulatedValue()

Implements abstract reactor.core.publisher.Operators.BaseFluxToMonoOperator.accumulatedValue.

Doc from reactor.core.publisher.Operators.BaseFluxToMonoOperator.accumulatedValue.

This method is being called either during onComplete invocation in case request has happened before, or during request invocation in case onComplete with no values has happened before.

Note

, this method expectedly returns null if cancellation happened before

Returns:T

accumulated/default value or null if cancelled before

Annotations
@Override
cancelback to summary
public void cancel()

Overrides reactor.core.publisher.Operators.BaseFluxToMonoOperator.cancel.

Implements org.reactivestreams.Subscription.cancel.

Doc from org.reactivestreams.Subscription.cancel.

Request the Publisher to stop sending data and clean up resources.

Data may still be sent to meet previously signalled demand after calling cancel.

Annotations
@Override
onCompleteback to summary
public void onComplete()

Implements org.reactivestreams.Subscriber.onComplete.

Doc from org.reactivestreams.Subscriber.onComplete.

Successful terminal state.

No further events will be sent even if Subscription#request(long) is invoked again.

Annotations
@Override
onErrorback to summary
public void onError(Throwable t)

Implements org.reactivestreams.Subscriber.onError.

Doc from org.reactivestreams.Subscriber.onError.

Failed terminal state.

No further events will be sent even if Subscription#request(long) is invoked again.

Parameters
t:Throwable

the throwable signaled

Annotations
@Override
onNextback to summary
public void onNext(T t)

Implements org.reactivestreams.Subscriber.onNext.

Doc from org.reactivestreams.Subscriber.onNext.

Data notification sent by the Publisher in response to requests to Subscription#request(long).

Parameters
t:T

the element signaled

Annotations
@Override
requestback to summary
public void request(long n)

Overrides reactor.core.publisher.Operators.BaseFluxToMonoOperator.request.

Implements org.reactivestreams.Subscription.request.

Doc from org.reactivestreams.Subscription.request.

No events will be sent by a Publisher until demand is signaled via this method.

It can be called however often and whenever needed—but if the outstanding cumulative demand ever becomes Long.MAX_VALUE or more, it may be treated by the Publisher as "effectively unbounded".

Whatever has been requested can be sent by the Publisher so only signal demand for what can be safely handled.

A Publisher can send less than is requested if the stream ends but then must emit either Subscriber#onError(Throwable) or Subscriber#onComplete().

Parameters
n:long

the strictly positive number of elements to requests to the upstream Publisher

Annotations
@Override
scanUnsafeback to summary
public Object scanUnsafe(Scannable.Attr<T> key)

Overrides reactor.core.publisher.Operators.BaseFluxToMonoOperator.scanUnsafe.

Overrides default reactor.core.publisher.InnerProducer.scanUnsafe.

Implements reactor.core.Scannable.scanUnsafe.

Doc from reactor.core.Scannable.scanUnsafe.

This method is used internally by components to define their key-value mappings in a single place. Although it is ignoring the generic type of the Attr key, implementors should take care to return values of the correct type, and return null if no specific value is available.

For public consumption of attributes, prefer using scan(Attr), which will return a typed value and fall back to the key's default if the component didn't define any mapping.

Parameters
key:Scannable.Attr<T>

a Attr to resolve for the component.

Returns:Object

the value associated to the key for that specific component, or null if none.

Annotations
@Override
@Nullable