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

The first example - a centralized system for event notification

In our first example, we are going to implement a system to send items from generators of events to consumers of events. We're going to use the SubmissionPublisher class to implement the communication between the producers and the consumers of events.

The Event class

This class stores the information of every item. Each item contains three attributes:

  • The msg attribute, to store a message in the Event
  • The source attribute, to store the name of the class that produces the Event
  • The date attribute, to store the date when the Event was produced

You have to declare the three attributes as private and include the methods to get() and set() the values of the attributes in the class.

The Producer class

We're going to use this class to implement tasks that generate events that will be sent to the consumers using a SubmissionPublisher object. The class implements the Runnable interface and stores two attributes:

  • The publisher attribute, that...