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)

Producers in action

To finish this chapter, we are going to update our RSS Reader so that it fetches information on demand. The idea is that we will fetch one feed at the beginning, and from there on we fetch one more feed as the user scrolls down close to the end of the list. That way, we reduce the amount of data consumed.

Having the adapter request more articles

We want to be able to request articles as the user scrolls, so the first step is to connect the adapter with the articles to a listener that can fetch more articles when needed. To do this, we are first going to add an interface to the same file where the class ArticleAdapter resides:

interface ArticleLoader {
suspend fun loadMore()

class ArticleAdapter: RecyclerView...