Book Image

Learning Concurrent Programming in Scala - Second Edition

By : Aleksandar Prokopec
Book Image

Learning Concurrent Programming in Scala - Second Edition

By: Aleksandar Prokopec

Overview of this book

Scala is a modern, multiparadigm programming language designed to express common programming patterns in a concise, elegant, and type-safe way. Scala smoothly integrates the features of object-oriented and functional languages. In this second edition, you will find updated coverage of the Scala 2.12 platform. The Scala 2.12 series targets Java 8 and requires it for execution. The book starts by introducing you to the foundations of concurrent programming on the JVM, outlining the basics of the Java Memory Model, and then shows some of the classic building blocks of concurrency, such as the atomic variables, thread pools, and concurrent data structures, along with the caveats of traditional concurrency. The book then walks you through different high-level concurrency abstractions, each tailored toward a specific class of programming tasks, while touching on the latest advancements of async programming capabilities of Scala. It also covers some useful patterns and idioms to use with the techniques described. Finally, the book presents an overview of when to use which concurrency library and demonstrates how they all work together, and then presents new exciting approaches to building concurrent and distributed systems. Who this book is written for If you are a Scala programmer with no prior knowledge of concurrent programming, or seeking to broaden your existing knowledge about concurrency, this book is for you. Basic knowledge of the Scala programming language will be helpful.
Table of Contents (19 chapters)
Learning Concurrent Programming in Scala - Second Edition
About the Author
About the Reviewers
Customer Feedback

The Scala Async library

In the final section of this chapter, we turn to the Scala Async library. You should understand that the Scala Async library does not add anything conceptually new to futures and promises. If you got this far in this chapter, you already know everything that you need to know about asynchronous programming, callbacks, future composition, promises, and blocking. You can start building asynchronous applications right away.

Having said that, the Scala Async library is a convenient library for futures and promises that allow expressing chains of asynchronous computations more conveniently. Every program that you express using the Scala Async library can also be expressed using futures and promises. Often, the Scala Async library allows writing shorter, more concise, and understandable programs.

The Scala Async library introduces two new method calls--the async and await methods. The async method is conceptually equivalent to the Future.apply method; it starts an asynchronous...