In the previous example, we used the
SubmissionPublisher class, so we didn't implement the
Flow.Publisher and the
Flow.Subscription interfaces. If the functionality provided by the
SubmissionPublisher doesn't fit our needs, we will have to implement our own publisher and subscription.
In this section, you will learn how to implement both interfaces to learn the specification of the reactive streams. We are going to implement a news system where each piece of news will be associated with a category. A subscriber will be subscribed to one or more categories and the publisher will only send a piece of news to each subscriber if it's subscribed to its category.
The first class we're going to implement is the
News class. This class represents each piece of news we're going to send from the publisher to the consumer. We're going to store three attributes:
- Thecategory attribute: An
intvalue that stores the category of the news. It can take the values...