io.smallrye.mutiny.groups

Class UniOnNotNull<T>

java.lang.Object

io.smallrye.mutiny.groups.UniOnNotNull<T>

public class UniOnNotNull<T>
extends Object

Constructor Summary

Constructors

Constructor and Description
UniOnNotNull(Uni<T> upstream)

Method Summary

Modifier and Type	Method and Description
<R> Uni<R>	apply(Function<? super T,? extends R> mapper) Produces a new Uni invoking the given function when the current Uni fires the item event.
Uni<T>	invoke(Consumer<? super T> callback) Produces a new Uni invoking the given callback when the item event is fired.
<R> Uni<R>	produceCompletionStage(Function<? super T,? extends CompletionStage<? extends R>> mapper) Transforms the received item asynchronously, forwarding the events emitted by another CompletionStage produced by the given mapper.
<R> Multi<R>	produceMulti(Function<? super T,? extends org.reactivestreams.Publisher<? extends R>> mapper) When this Uni produces its item (not null), call the given mapper to produce a Publisher.
<R> Uni<R>	produceUni(BiConsumer<? super T,UniEmitter<? super R>> consumer) Transforms the received item asynchronously, forwarding the events emitted an UniEmitter consumes by the given consumer.
<R> Uni<R>	produceUni(Function<? super T,? extends Uni<? extends R>> mapper) Transforms the received item asynchronously, forwarding the events emitted by another Uni produced by the given mapper.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UniOnNotNull

public UniOnNotNull(Uni<T> upstream)

Method Detail

invoke

public Uni<T> invoke(Consumer<? super T> callback)

Produces a new Uni invoking the given callback when the item event is fired. If the item is null, the callback is not invoked.

Parameters:

callback - the callback, must not be null

Returns:

the new Uni

apply

public <R> Uni<R> apply(Function<? super T,? extends R> mapper)

Produces a new Uni invoking the given function when the current Uni fires the item event. The function receives the (non-null) item as parameter, and can transform it. The returned object is sent downstream as item.

If the item is `null`, the mapper is not called and it produces a null item.

For asynchronous composition, see produceUni(Function).

Type Parameters:

R - the type of Uni item

Parameters:

mapper - the mapper function, must not be null

Returns:

the new Uni

produceUni

public <R> Uni<R> produceUni(Function<? super T,? extends Uni<? extends R>> mapper)

Transforms the received item asynchronously, forwarding the events emitted by another Uni produced by the given mapper.

The mapper is called with the item event of the current Uni and produces an Uni, possibly using another type of item (R). The events fired by produced Uni are forwarded to the Uni returned by this method.

If the item is null, the mapper is not called, and null is propagated downstream.

This operation is generally named flatMap.

Type Parameters:

R - the type of item

Parameters:

mapper - the function called with the item of this Uni and producing the Uni, must not be null, must not return null.

Returns:

a new Uni that would fire events from the uni produced by the mapper function, possibly in an asynchronous manner.

produceMulti

public <R> Multi<R> produceMulti(Function<? super T,? extends org.reactivestreams.Publisher<? extends R>> mapper)

When this Uni produces its item (not null), call the given mapper to produce a Publisher. Continue the pipeline with this publisher (as a Multi).

The mapper is called with the item event of the current Uni and produces a Publisher, possibly using another type of item (R). Events fired by the produced Publisher are forwarded to the Multi returned by this method.

If the item is `null`, the mapper is not called and an empty Multi is produced.

This operation is generally named flatMapPublisher.

Type Parameters:

R - the type of item produced by the resulting Multi

Parameters:

mapper - the mapper, must not be null, may expect to receive null as item.

Returns:

the multi

produceCompletionStage

public <R> Uni<R> produceCompletionStage(Function<? super T,? extends CompletionStage<? extends R>> mapper)

Transforms the received item asynchronously, forwarding the events emitted by another CompletionStage produced by the given mapper.

The mapper is called with the item event of the current Uni and produces an CompletionStage, possibly using another type of item (R). The events fired by produced CompletionStage are forwarded to the Uni returned by this method.

If the incoming item is null, the mapper is not called, and a CompletionStage redeeming null is returned.

Type Parameters:

R - the type of item

Parameters:

mapper - the function called with the item of this Uni and producing the CompletionStage, must not be null, must not return null.

Returns:

a new Uni that would fire events from the uni produced by the mapper function, possibly in an asynchronous manner.

produceUni

public <R> Uni<R> produceUni(BiConsumer<? super T,UniEmitter<? super R>> consumer)

Transforms the received item asynchronously, forwarding the events emitted an UniEmitter consumes by the given consumer.

The consumer is called with the item event of the current Uni and an emitter uses to fire events. These events are these propagated by the produced Uni.

If the incoming item is null, the consumer is not called and a null item is propagated downstream.

Type Parameters:

R - the type of item emitted by the emitter

Parameters:

consumer - the function called with the item of the this Uni and an UniEmitter. It must not be null.

Returns:

a new Uni that would fire events from the emitter consumed by the mapper function, possibly in an asynchronous manner.