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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 FREE CHAPTER 2. Basic Thread Synchronization 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

Separating the launching of tasks and the processing of their results in an executor

Normally, when you execute concurrent tasks using an executor, you will send Runnable or Callable tasks to the executor and get Future objects to control the method. You can find situations where you need to send the tasks to the executor in one object and process the results in another one. For such situations, the Java Concurrency API provides the CompletionService class.

The CompletionService class has a method to send tasks to an executor and a method to get the Future object for the next task that has finished its execution. Internally, it uses an Executor object to execute the tasks. This behavior has the advantage of sharing a CompletionService object and sending tasks to the executor so others can process the results. The limitation is that the second object can only get the Future objects for those tasks that have finished...

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