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Java 9 Concurrency Cookbook, Second Edition

Java 9 Concurrency Cookbook, Second Edition

By : Javier Fernández González
4 (1)
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Java 9 Concurrency Cookbook, Second Edition

Java 9 Concurrency Cookbook, Second Edition

4 (1)
By: Javier Fernández González

Overview of this book

Writing concurrent and parallel programming applications is an integral skill for any Java programmer. Java 9 comes with a host of fantastic features, including significant performance improvements and new APIs. This book will take you through all the new APIs, showing you how to build parallel and multi-threaded applications. The book covers all the elements of the Java Concurrency API, with essential recipes that will help you take advantage of the exciting new capabilities. You will learn how to use parallel and reactive streams to process massive data sets. Next, you will move on to create streams and use all their intermediate and terminal operations to process big collections of data in a parallel and functional way. Further, you’ll discover a whole range of recipes for almost everything, such as thread management, synchronization, executors, parallel and reactive streams, and many more. At the end of the book, you will learn how to obtain information about the status of some of the most useful components of the Java Concurrency API and how to test concurrent applications using different tools.
Table of Contents (19 chapters)
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Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Using executors instead of thread groups


The ThreadGroup class provides a mechanism to group threads in a hierarchical structure so you can do operations with all the threads that belong to a thread group with only one call. By default, all the threads belong to the same group, but you can specify a different one when you create the thread.

Anyway, thread groups don't provide any features that make their use interesting:

  • You have to create the threads and manage their status
  • The methods that control the status of all the threads of the thread group have been deprecated and their use is discouraged

If you need to group threads under a common structure, it is better to use an Executor implementation, such as ThreadPoolExecutor. It provides more functionalities, which are as follows:

  • You don't have to worry about the management of the threads. The executor creates and reuses them to save execution resources.
  • You can implement your concurrent tasks by implementing either the Runnable or Callable interface...

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