The Flow API

The Flow class is part of the java.util.concurrent package. It helps developers incorporate reactive programming in their applications. The class has one method, defaultBufferSize(), and four interfaces.

The defaultBufferSize() method is a static method that returns the default buffer size for publishing and subscribing buffering. Its default value is 256 and it is returned as an int.

Let's look at the four interfaces.

The Flow.Publisher interface

The Flow.Publisher interface is a functional interface. A Publisher is a producer of data sent to subscribers:

@FunctionalInterface
public static interface Flow.Publisher<T>

This functional interface can serve as a Lambda expression assignment target. It only...