Top Description Inners Fields Constructors Methods
reactor.core.publisher

pack-priv final Class MonoSingleOptional<T>

extends InternalMonoOperator<T, Optional<T>>
Class Inheritance
Type Parameters
<T>
the value type
Imports
java.util.Optional, org.reactivestreams.Subscription, reactor.core.CoreSubscriber, reactor.util.annotation.Nullable, reactor.util.context.Context
Emits a single item from the source wrapped into an Optional, emits an empty Optional instead for empty source.
See Also
Reactive-Streams-Commons

Nested and Inner Type Summary

Modifier and TypeClass and Description
pack-priv static class
MonoSingleOptional.SingleOptionalSubscriber<T>

Field Summary

Inherited from reactor.core.publisher.InternalMonoOperator:
optimizableOperator

Constructor Summary

AccessConstructor and Description
pack-priv
MonoSingleOptional(Mono<? extends T> source)

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.InternalMonoOperator.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 Optional<T>> actual)

Implements abstract reactor.core.publisher.InternalMonoOperator.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.InternalMonoOperator:
nextOptimizableSourcesourcesubscribe

Constructor Detail

MonoSingleOptionalback to summary
pack-priv MonoSingleOptional(Mono<? extends T> source)

Method Detail

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

Overrides reactor.core.publisher.InternalMonoOperator.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 Optional<T>> actual)

Implements abstract reactor.core.publisher.InternalMonoOperator.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 MonoSingleOptional.SingleOptionalSubscriber<T>

extends Operators.MonoInnerProducerBase<Optional<T>>
implements InnerConsumer<T>
Class Inheritance
All Implemented Interfaces
reactor.core.publisher.InnerConsumer, reactor.core.Scannable, reactor.core.CoreSubscriber, org.reactivestreams.Subscriber

Field Summary

Modifier and TypeField and Description
pack-priv boolean
done

pack-priv Subscription
s

Constructor Summary

AccessConstructor and Description
pack-priv
SingleOptionalSubscriber(CoreSubscriber<? super Optional<T>> actual)

Method Summary

Modifier and TypeMethod and Description
public Context
currentContext()

Overrides default reactor.core.CoreSubscriber.currentContext.

Request a Context from dependent components which can include downstream operators during subscribing or a terminal org.reactivestreams.Subscriber.
public void
doOnCancel()

Overrides reactor.core.publisher.Operators.MonoInnerProducerBase.doOnCancel.

Hook for subclasses, called as the first operation when cancel() is called.
public void
doOnRequest(long
the value passed to request(long)
n)

Overrides reactor.core.publisher.Operators.MonoInnerProducerBase.doOnRequest.

Hook for subclasses on the first request successfully marked on the state
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
onSubscribe(Subscription
the Subscription that allows requesting data via Subscription#request(long)
s)

Implements reactor.core.CoreSubscriber.onSubscribe.

Implementors should initialize any state used by onNext(Object) before calling Subscription#request(long).
public Object
scanUnsafe(Scannable.Attr<T>
a Attr to resolve for the component.
key)

Overrides reactor.core.publisher.Operators.MonoInnerProducerBase.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.MonoInnerProducerBase:
actualcancelcompletecompletediscarddiscardTheValuedoOnCompleteisCancelledrequestsetValue

Field Detail

doneback to summary
pack-priv boolean done
sback to summary
pack-priv Subscription s

Constructor Detail

SingleOptionalSubscriberback to summary
pack-priv SingleOptionalSubscriber(CoreSubscriber<? super Optional<T>> actual)

Method Detail

currentContextback to summary
public Context currentContext()

Overrides default reactor.core.CoreSubscriber.currentContext.

Doc from reactor.core.CoreSubscriber.currentContext.

Request a Context from dependent components which can include downstream operators during subscribing or a terminal org.reactivestreams.Subscriber.

Returns:Context

a resolved context or Context#empty()

Annotations
@Override
doOnCancelback to summary
public void doOnCancel()

Overrides reactor.core.publisher.Operators.MonoInnerProducerBase.doOnCancel.

Doc from reactor.core.publisher.Operators.MonoInnerProducerBase.doOnCancel.

Hook for subclasses, called as the first operation when cancel() is called. Default implementation is a no-op.

Annotations
@Override
doOnRequestback to summary
public void doOnRequest(long n)

Overrides reactor.core.publisher.Operators.MonoInnerProducerBase.doOnRequest.

Doc from reactor.core.publisher.Operators.MonoInnerProducerBase.doOnRequest.

Hook for subclasses on the first request successfully marked on the state

Parameters
n:long

the value passed to request(long)

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
onSubscribeback to summary
public void onSubscribe(Subscription s)

Implements reactor.core.CoreSubscriber.onSubscribe.

Doc from reactor.core.CoreSubscriber.onSubscribe.

Implementors should initialize any state used by onNext(Object) before calling Subscription#request(long). Should further onNext related state modification occur, thread-safety will be required.

Note that an invalid request <= 0 will not produce an onError and will simply be ignored or reported through a debug-enabled reactor.util.Logger. Invoked after calling Publisher#subscribe(Subscriber).

No data will start flowing until Subscription#request(long) is invoked.

It is the responsibility of this Subscriber instance to call Subscription#request(long) whenever more data is wanted.

The Publisher will send notifications only in response to Subscription#request(long).

Parameters
s:Subscription

Doc from org.reactivestreams.Subscriber.onSubscribe.

the Subscription that allows requesting data via Subscription#request(long)

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

Overrides reactor.core.publisher.Operators.MonoInnerProducerBase.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