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
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Transactional collections

In this section, we take a step away from transactional references, and study more powerful transactional constructs, called, transactional collections. While transactional references can only hold a single value at once, transactional collections can manipulate multiple values. In principle, the atomic statements and transactional references are sufficient to express any kind of transaction over shared data. However, ScalaSTM's transactional collections are deeply integrated with the STM. They can be used to express shared data operations more conveniently and execute the transactions more efficiently.

Transaction-local variables

We have already seen that some transactions need to create a local mutable state that exists only during the execution of the transaction. Sometimes, we need to re-declare the same state over and over again for multiple transactions. In such cases, we would like to declare the same state once, and reuse it in multiple transactions. A construct...