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

Monitoring concurrency objects

Most of the concurrency objects provided by the Java concurrency API include methods to learn their status. This status can include the number of threads that are executing, the number of threads blocked waiting for a condition, the number of tasks executed, and so on. In this section, you will learn the most important methods you can use and the information you can obtain from them. This information can be very useful to detect the cause of an error, especially if it only occurs in very rare conditions.

Monitoring a thread

The thread is the most basic element in the Java concurrency API. It allows you to implement a raw task. You decide what code is going to execute (extending the Thread class or implementing the Runnable interface), when it starts its execution, and how it synchronizes with other tasks of the application. The Thread class provides some methods to obtain information about a thread. These are the most useful methods:

  • getId(): This method returns...