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Coroutines in Action

It's time to start coding. In this chapter, we will go through the process of enabling support for coroutines in an Android project using Android Studio, and we will use coroutines to solve a common scenario for mobile apps: calling a REST service and displaying some of the response without blocking the UI thread.

Topics that will be covered in this chapter include:

Android Studio configuration for Kotlin and projects using coroutines
Android's UI thread
REST calls in a background thread using coroutines
Coroutine builders async() and launch()
Introduction to coroutine dispatchers

Key benefits

Understand Kotlin’s unique approach to multithreading

Learn how to write concurrent non-blocking code with the help of practical examples

Improve the overall execution speed in multiprocessor and multicore systems

Description

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.

What you will learn

Build secure applications by testing your concurrent code

Implement sequential and asynchronous suspending functions

Create suspending data sources that can be resumed on demand

Explore best practices for error handling

Use channels to communicate between coroutines

Discover how coroutines help to build parallel applications

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

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

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Cliente Amazon Sep 07, 2020

Very good book, very much comprehensive! It covers a lot of topics and it is really simple to understand. Highly recommended!

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Ahmed Shakil Sep 08, 2019

Honestly I was not expecting this book to explain Coroutines in such an easy and simple way! Author is very experienced in Coroutines and knows how to transfer that knowledge through a book.I request the author to please update the book with new language features and final version of Coroutines release.

SG May 23, 2019

I really enjoyed reading this book. Unlike many other books on programming languages, this book is NOT a replica or reworded form of the official documentation. The author has really tried to take it a step further to break down complicate concepts an terminology into small chunks which can be absorbed easily. The last chapter on the internals is very helpful in understanding that coroutines are not just magic. They are based on the foundations of classical programming patterns like callbacks, but on steroids.There is however one part of the book which left me unsatisfied and actually confused at the very least. The chapters on Sequence Generators, Iterators and Channels have a lot of terminology or wording which overlaps. So I found it really hard to understand the nuances between them. For example, the chapter on iterators opens with the statement that so far we have learned about suspending functions which suspend while waiting for other operations to complete. So now lets take a look at a different kind of suspending functions for example sequence generators. However, the next chapter on Producers opens with a statement that because iterators and generators only suspend between invocations and not during executions, it is serious limitation and Producers solve this problem. So its like going back to the regular old suspending functions. So it is unclear why iterators were introduced in the book before producers even though the Producers follow the previous chapters more closely. Moreover, since Producers are based on Channels and there is a dedicated chapter for channels in the book, I felt that Channels should have been introduced before talking about Producers. In short, these 2-3 chapters were a mess and took me a couple of a readings to understand the nuances.

Andrew E. Olson Aug 29, 2019

The coverage is pretty in depth and addressing the relevancy of Kotlin on both Android AND desktop/server is a good approach for breadth. That said, since this was written, Kotlin has moved on so that coroutines have since stabilized which puts the project setup instructions out of date and much of the code out of date. And as of Kotlin 1.3, coroutines have been declared a stable API making a potential new edition of this not only up-to-date, but LASTINGLY. Furthermore, Kotlin-native is now a thing and coverage on concurrency there to compliment the android/desktop breadth would take it another step along with some mention of how coroutines apply to the JavaScript target. So, in short, this is a wonderful book, but it is stuck in yesterday for the time being. And the subject is exploding with relevancy as of the new stability in 1.3 so I would be excited for a new edition. (as a note, I gave the android project with an OLD coroutines version a stab so that I could use the supplied code verbatim, hoping gradle could be coerced to work with the very old kotlin compiler + kotlinx libraries. Well, Android Studio flat out refused ancient Kotlin which is understandable since an IDE front-end must know how to parse a language, but command line gradle also wouldn't cooperate and a modest attempt to use old gradle versions also stumped me with tripwires. I hesitate to flatten a box to go old ubuntu + old android studio because it'll just be more work to learn now irrelevant info. Book really needs a 1.3 bump.

Dimitri K May 30, 2020

Lots of buzzwords like "blocking" but no clear explanation of principles. Examples for Android, have many unnecessary details, but no organization. Messy, verbose book, with lots of marketing buzzwords, but poor on content. I only give it 3 stars because there is no good one, at least I could not find, and official spec is also very poor.

Learning Concurrency in Kotlin: Build highly efficient and scalable applications

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Learning Concurrency in Kotlin

Coroutines in Action

Downloading and installing Android Studio

Creating a Kotlin project

Adding support for coroutines

Android's UI thread

CalledFromWrongThreadException

Creating a thread

CoroutineDispatcher

Adding networking permissions

Creating a coroutine to call a service

Adding UI elements

Displaying the amount of news that were processed

Using a UI dispatcher

Platform-specific UI libraries

Creating an asynchronous function to hold the request... or not

A synchronous function wrapped in an asynchronous caller

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