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)


This chapter covered many interesting topics of practical concurrency in Kotlin. Let's do a recap of the key topics.

  • Android applications will throw NetworkOnMainThreadException if a network request is done on the UI thread.
  • Android applications can only update the UI on the UI thread, and trying to do it from a different thread will produce a CalledFromWrongThreadException.
  • Network requests have to be done in a background thread. The information has to be sent to the UI thread for the views to be updated.
  • A CoroutineDispatcher can be used to enforce a coroutine to run in a specific thread, or group of threads.
  • One or many coroutines can be run in a thread by using launch or async.
  • launch should be used in fire-and-forget scenarios, meaning cases where we aren't expecting the coroutine to return something.
  • async should be used when the coroutine will produce...