Book Image

Mastering Concurrency Programming with Java 9 - Second Edition

By : Javier Fernández González
Book Image

Mastering Concurrency Programming with Java 9 - Second Edition

By: Javier Fernández González

Overview of this book

Concurrency programming allows several large tasks to be divided into smaller sub-tasks, which are further processed as individual tasks that run in parallel. Java 9 includes a comprehensive API with lots of ready-to-use components for easily implementing powerful concurrency applications, but with high flexibility so you can adapt these components to your needs. The book starts with a full description of the design principles of concurrent applications and explains how to parallelize a sequential algorithm. You will then be introduced to Threads and Runnables, which are an integral part of Java 9's concurrency API. You will see how to use all the components of the Java concurrency API, from the basics to the most advanced techniques, and will implement them in powerful real-world concurrency applications. The book ends with a detailed description of the tools and techniques you can use to test a concurrent Java application, along with a brief insight into other concurrency mechanisms in JVM.
Table of Contents (21 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback


In this chapter, you have learnt how Java 9 implements the reactive streams specification. It defines a standard for asynchronous stream processing with non-blocking back pressure. It's based on the following three elements:

  • A publisher of information
  • One or more subscribers of that information
  • A subscription between the publisher and a consumer

Java provides three interfaces to implement those elements:

  • The Flow.Publisher interface, to implement the publishers of information
  • The Flow.Subscriber interface, to implement the subscribers (consumers) of that information
  • The Flow.Subscription interface, to implement the subscription between publishers and subscribers

Java also provides a utility class, the SubmissionPublisher class that implements the Publisher interface and can be used if our application has default behavior.

We have implemented two examples with the two implementation variants you can use with reactive streams in Java. We have implemented an event notification system implementing...