PublisherOperator

Type Parameters:

T - Type of items emitted by the Publisher this operator is applied.

R - Type of items emitted by this operator.

All Superinterfaces:

java.util.function.Function<PublisherSource.Subscriber<? super R>,PublisherSource.Subscriber<? super T>>
```
public interface PublisherOperator<T,R>
extends java.util.function.Function<PublisherSource.Subscriber<? super R>,PublisherSource.Subscriber<? super T>>
```
An operator contract for a Publisher. Logically an operator sits between a Publisher and a PublisherSource.Subscriber and hence it has two responsibilities:
- Subscribe to the Publisher on which this operator is applied.
- Accept a PublisherSource.Subscriber that subscribes to this operator.
So, an operator can be defined as a Function that takes a PublisherSource.Subscriber and returns a PublisherSource.Subscriber. The PublisherSource.Subscriber that is passed to this Function is the one that has subscribed to this operator. The PublisherSource.Subscriber that is returned by this Function is the one that should be used to subscribe to the Publisher on which this operator is applied.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`PublisherSource.Subscriber<? super T>`	`apply(PublisherSource.Subscriber<? super R> subscriber)`	Implementation of this operator.

Methods inherited from interface java.util.function.Function
andThen, compose

- Method Detail
  - apply
```
PublisherSource.Subscriber<? super T> apply(PublisherSource.Subscriber<? super R> subscriber)
```
    Implementation of this operator. See PublisherOperator for definition of an operator.
    
    Specified by:
    
    apply in interface java.util.function.Function<T,R>
    
    Parameters:
    
    subscriber - PublisherSource.Subscriber that subscribed to this operator.
    
    Returns:
    
    PublisherSource.Subscriber that is used to subscribe to the Publisher that this operator is applied to.