Scala Reactive Programming

Flow API – Publisher

As its name suggests, Publisher is a component that works as a Producer of data, which means it emits the data. It acts as a source of data, so it is also known as Producer, Source of data, or emitter:

In the Java 9 Flow API, this Publisher is an interface with the subscribe method and is defined with the following signature:

public interface Publisher<T> {   
  public void subscribe(Subscriber<? super T> subscriber);   
}       

Here, the subscribe() method is taking a single parameter of type Subscriber, which is another component of the Flow API. One publisher can subscribe one or more subscribers to it. It is defined within another ...