io.smallrye.mutiny.groups

Class MultiOnSubscribe<T>

java.lang.Object

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

Type Parameters:

T - the type of item

public class MultiOnSubscribe<T>
extends Object

Group to configure the action to execute when the observed Multi sends a Subscription. The downstream don't have a subscription yet. It will be passed once the configured action completes. For example:

 
 multi.onSubscribe().invoke(sub -> System.out.println("subscribed"));
 // Delay the subscription by 1 second (or until an asynchronous action completes)
 multi.onSubscribe().invokeUni(sub -> Uni.createFrom(1).onItem().delayIt().by(Duration.ofSecond(1)));
 
 

Constructor Summary

Constructors

Constructor and Description
MultiOnSubscribe(Multi<T> upstream)

Method Summary

Modifier and Type	Method and Description
Multi<T>	invoke(Consumer<? super org.reactivestreams.Subscription> callback) Produces a new Multi invoking the given callback when the subscription is received.
Multi<T>	invokeUni(Function<? super org.reactivestreams.Subscription,Uni<?>> action) Produces a new Multi invoking the given @{code action} when the subscription event is received.

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiOnSubscribe

public MultiOnSubscribe(Multi<T> upstream)

Method Detail

invoke

public Multi<T> invoke(Consumer<? super org.reactivestreams.Subscription> callback)

Produces a new Multi invoking the given callback when the subscription is received.

The callback in invoked before passing a subscription event downstream. If the callback throws an exception, the downstream receives a subscription and the failure immediately.

Parameters:

callback - the callback, must not be null.

Returns:

the new Multi

invokeUni

public Multi<T> invokeUni(Function<? super org.reactivestreams.Subscription,Uni<?>> action)

Produces a new Multi invoking the given @{code action} when the subscription event is received.

Unlike invoke(Consumer), the passed function returns a Uni. When the produced Uni sends the subscription, the function is called. The subscription event is passed downstream only when the Uni completes. If the produced Uni fails or if the function throws an exception, the failure is propagated downstream.

Parameters:

action - the callback, must not be null

Returns:

the new Multi