Module java.base

Package java.util.concurrent

Interface Flow.Subscription

Enclosing class:

Flow

public static interface Flow.Subscription

Message control linking a Flow.Publisher and Flow.Subscriber. Subscribers receive items only when requested, and may cancel at any time. The methods in this interface are intended to be invoked only by their Subscribers; usages in other contexts have undefined effects.

Method Summary

Modifier and Type	Method	Description
void	cancel()	Causes the Subscriber to (eventually) stop receiving messages.
void	request(long n)	Adds the given number n of items to the current unfulfilled demand for this subscription.

Method Details

request

void request(long n)

Adds the given number n of items to the current unfulfilled demand for this subscription. If n is less than or equal to zero, the Subscriber will receive an onError signal with an IllegalArgumentException argument. Otherwise, the Subscriber will receive up to n additional onNext invocations (or fewer if terminated).

Parameters:

n - the increment of demand; a value of Long.MAX_VALUE may be considered as effectively unbounded

cancel

void cancel()

Causes the Subscriber to (eventually) stop receiving messages. Implementation is best-effort -- additional messages may be received after invoking this method. A cancelled subscription need not ever receive an onComplete or onError signal.