Book Image

Mastering Concurrency Programming with Java 9, Second Edition - Second Edition

By : Javier Fernández González
Book Image

Mastering Concurrency Programming with Java 9, Second Edition - 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
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Chapter 3. Managing Lots of Threads - Executors

When you implement a simple concurrent application, you create and execute a thread per concurrent task. This approach can have some important issues. Since Java version 5, the Java concurrency API has included the Executor framework to improve the performance of concurrent applications with a lot of concurrent tasks. In this chapter, we will cover the following:

  • An introduction to executors
  • The first example - the k-nearest neighbors algorithm
  • The second example - concurrency in a client/server environment