Book Image

Learning Concurrency in Kotlin

By : Miguel Angel Castiblanco Torres
Book Image

Learning Concurrency in Kotlin

By: Miguel Angel Castiblanco Torres

Overview of this book

Kotlin is a modern and statically typed programming language with support for concurrency. Complete with detailed explanations of essential concepts, practical examples and self-assessment questions, Learning Concurrency in Kotlin addresses the unique challenges in design and implementation of concurrent code. This practical guide will help you to build distributed and scalable applications using Kotlin. Beginning with an introduction to Kotlin's coroutines, you’ll learn how to write concurrent code and understand the fundamental concepts needed to write multithreaded software in Kotlin. You'll explore how to communicate between and synchronize your threads and coroutines to write collaborative asynchronous applications. You'll also learn how to handle errors and exceptions, as well as how to work with a multicore processor to run several programs in parallel. In addition to this, you’ll delve into how coroutines work with each other. Finally, you’ll be able to build an Android application such as an RSS reader by putting your knowledge into practice. By the end of this book, you’ll have learned techniques and skills to write optimized code and multithread applications.
Table of Contents (11 chapters)


In this chapter, we covered some of the most important details of how coroutines actually work. We put ourselves in the place of the compiler and transformed a suspending function into a state machine. We also analyzed big chunks of Kotlin's code to understand how a coroutine is intercepted in order to change (or not change) its thread, as well as to understand how exceptions are propagated. Here are some things you should remember:

  • The suspending computations are transformed into state machines, and via the use of CPS they become callbacks for other suspending functions.
  • The Kotlin language itself had little changes made to it in order to support coroutines. Most of the work is done by the compiler and the coroutines library.
  • Continuations are wrapped into DispatchedContinuations at runtime. This allows the CoroutineDispatcher to intercept the coroutine, both when...