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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

Monitoring a Semaphore class


A semaphore is a counter that protects the access to one or more shared resources.

Note

The concept of semaphore was introduced by Edsgar Dijkstra in 1965 and was used for the first time in the THEOS operating system.

When a thread wants to use shared resources, it must acquire a semaphore. If the internal counter of the semaphore is greater than 0, the semaphore decrements the counter and allows the access to the shared resource. If the counter of the semaphore is 0, the semaphore blocks the thread until the counter is greater than 0. When the thread has finished using the shared resource, it must release the semaphore. That operation increases the internal counter of the semaphore.

In Java, semaphores are implemented in the Semaphore class.

In this recipe, you will learn what information you can obtain about the status of a semaphore and how to obtain it.

Getting ready

The example of this recipe has been implemented using the Eclipse IDE. If you use Eclipse or any...

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