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Working with Basic Elements - Threads and Runnables

Execution threads are the core of concurrent applications. When you implement a concurrent application, no matter the language, you have to create different execution threads that run in parallel in a non-deterministic order unless you use a synchronization element (such as a semaphore). In Java you can create execution threads in two ways:

Extending the Thread class
Implementing the Runnable interface

In this chapter, you will learn how to use these elements to implement concurrent applications in Java. We will cover the following topics:

Threads in Java: characteristics and states
The Thread class and the Runnable interface
First example: matrix multiplication
Second example: file search

Key benefits

Implement concurrent applications using the Java 8 Concurrency API and its new components

Improve the performance of your applications or process more data at the same time, taking advantage of all of your resources.

Construct real-world examples related to machine learning, data mining, image processing, and client/server environments

Description

Concurrency programming allows several large tasks to be divided into smaller sub-tasks, which are further processed as individual tasks that run in parallel. All the sub-tasks are combined together once the required results are achieved; they are then merged to get the final output. The whole process is very complex. This process goes from the design of concurrent algorithms to the testing phase where concurrent applications need extra attention. Java includes a comprehensive API with a lot of ready-to-use components to implement powerful concurrency applications in an easy way, but with a high flexibility to adapt these components to your needs. The book starts with a full description of design principles of concurrent applications and how to parallelize a sequential algorithm. We'll show you how to use all the components of the Java Concurrency API from basics to the most advanced techniques to implement them in powerful concurrency applications in Java. You will be using real-world examples of complex algorithms related to machine learning, data mining, natural language processing, image processing in client / server environments. Next, you will learn how to use the most important components of the Java 8 Concurrency API: the Executor framework to execute multiple tasks in your applications, the phaser class to implement concurrent tasks divided into phases, and the Fork/Join framework to implement concurrent tasks that can be split into smaller problems (using the divide and conquer technique). Toward the end, we will cover the new inclusions in Java 8 API, the Map and Reduce model, and the Map and Collect model. The book will also teach you about the data structures and synchronization utilities to avoid data-race conditions and other critical problems. Finally, the book ends with a detailed description of the tools and techniques that you can use to test a Java concurrent application.

What you will learn

* Design concurrent applications by converting a sequential algorithm into a concurrent one

* Discover how to avoid all the possible problems you can get in concurrent algorithms

* Use the Executor framework to manage concurrent tasks without creating threads

* Extend and modify Executors to adapt their behavior to your needs

* Solve problems using the divide and conquer technique and the Fork/Join framework

* Process massive data sets with parallel streams and Map/Reduce implementation

* Control data-race conditions using concurrent data structures and synchronization mechanisms

* Test and monitor concurrent applications

What do you get with eBook?

Instant access to your Digital eBook purchase

Download this book in EPUB and PDF formats

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

Frequently bought together

€32.99

Java 9 Concurrency Cookbook, Second Edition

€41.99

Mastering Concurrency Programming with Java 9, Second Edition

€41.99

Total € 116.97

Devendra S. Apr 18, 2019

Good quality

Amazon Verified review

Biswajit May 05, 2018

Good book but expecting some more areas to cover, Streams concepts are covered very nicely

Commuter Jun 03, 2022

I have no complaints about the quality or scope of the work, but I feel it could do with more focussed examples that illustrate different aspects of the Java API better. Every topic is only briefly introduced and then followed by a 10-20 page example where you have to spend time and energy to understand the coding problem rather than the specific concurrency tool being discussed. I think it would have been better to have more half-page snippets showcasing key behaviours instead.Brian Goetz's Java Concurrency in Practice provides more focussed examples and is much better at discussing various trade offs between conccurrency options, alas it needs updating to Java 9.

Richard Oct 28, 2019

Hard to follow due to incomplete code example. Some of the code examples were unable to open due to wrong format.

Mastering Concurrency Programming with Java 8: Master the principles and techniques of multithreaded programming with the Java 8 Concurrency API

What do you get with eBook?

Mastering Concurrency Programming with Java 8

Working with Basic Elements - Threads and Runnables

Threads in Java

First example: matrix multiplication

Common classes

Second example - file search

Common classes

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Mastering Concurrency Programming with Java 8: Master the principles and techniques of multithreaded programming with the Java 8 Concurrency API

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