io.servicetalk.concurrent.api

Interface SingleOperator<T,R>

Type Parameters:

T - Type of the result of the Single this operator is applied.

R - Type of the result of this operator.

All Superinterfaces:

Function<SingleSource.Subscriber<? super R>,SingleSource.Subscriber<? super T>>

public interface SingleOperator<T,R>
extends Function<SingleSource.Subscriber<? super R>,SingleSource.Subscriber<? super T>>

An operator contract for a Single. Logically an operator sits between a Single and a SingleSource.Subscriber and hence it has two responsibilities:

• Subscribe to the Single on which this operator is applied.
• Accept a SingleSource.Subscriber that subscribes to this operator.

So, an operator can be defined as a Function that takes a SingleSource.Subscriber and returns a SingleSource.Subscriber. The SingleSource.Subscriber that is passed to this Function is the one that has subscribed to this operator. The SingleSource.Subscriber that is returned by this Function is the one that should be used to subscribe to the Single on which this operator is applied.

Method Summary

Modifier and Type	Method and Description
SingleSource.Subscriber<? super T>	apply(SingleSource.Subscriber<? super R> subscriber) Implementation of this operator.

Methods inherited from interface Function

andThen, compose, identity

Method Detail

apply

SingleSource.Subscriber<? super T> apply(SingleSource.Subscriber<? super R> subscriber)

Implementation of this operator. See SingleOperator for definition of an operator.

Specified by:

apply in interface Function<SingleSource.Subscriber<? super R>,SingleSource.Subscriber<? super T>>

Parameters:

subscriber - SingleSource.Subscriber that subscribed to this operator.

Returns:

SingleSource.Subscriber that is used to subscribe to the Single that this operator is applied to.