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Java 9 Concurrency Cookbook, Second Edition

You're reading from   Java 9 Concurrency Cookbook, Second Edition Build highly scalable, robust, and concurrent applications

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781787124417
Length 594 pages
Edition 2nd Edition
Languages
Concepts
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Author (1):
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Javier Fernández González Javier Fernández González
Author Profile Icon Javier Fernández González
Javier Fernández González
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Table of Contents (12) Chapters Close

Preface 1. Thread Management 2. Basic Thread Synchronization FREE CHAPTER 3. Thread Synchronization Utilities 4. Thread Executors 5. Fork/Join Framework 6. Parallel and Reactive Streams 7. Concurrent Collections 8. Customizing Concurrency Classes 9. Testing Concurrent Applications 10. Additional Information 11. Concurrent Programming Design

Joining the results of the tasks

The fork/join framework provides the ability to execute tasks that return a result. This kind of tasks is implemented by the RecursiveTask class. This class extends the ForkJoinTask class and implements the Future interface provided by the Executor framework.

Inside the task, you have to use the structure recommended by the Java API documentation:

    if (problem size > size){ 
tasks=Divide(task);
execute(tasks);
joinResults()
return result;
} else {
resolve problem;
return result;
}

If the task has to resolve a problem bigger than a predefined size, you divide the problem into more subtasks and execute those subtasks using the fork/join framework. When they finish their execution, the initiating task obtains the results generated by all the subtasks, groups them, and returns the final result. Ultimately, when the initiating task executed...

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