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 contained information that is vital when working with coroutines. Knowing about the different states of a job and how to calculate the current one is important in order to monitor them. Let's recap the topics that were covered in this chapter:

  • Job is used for background tasks that don't return anything.
  • Deferred is used when the background operation returns something that we want to receive.
  • A job can have many states: New, Active, Canceling, Cancelled, and Completed.
  • The isActive, isCancelled, and isCompleted properties can be used to determine the current state of a job.
  • Deferred extends job to add the possibility to return something.
  • The possible states of deferred are the same as that of a job.
  • A job's state can only move forward; it can't be returned to a previous state.
  • A final state is one of the states from which a job can&apos...