Asynchronous Kotlin: The Complete Guide

Modern development in Kotlin is unthinkable without an understanding of asynchrony. The book "Asynchronous Kotlin: The Complete Guide" is a comprehensive source of knowledge that will take you from the basics of coroutines to building complex concurrent systems. The author, Alexey Petrov, a senior developer with 10 years of experience, shares not only theory but also proven design patterns.

What is this book about?

The book covers all aspects of asynchronous programming in Kotlin:

• Coroutines — from creating your first coroutine to a deep understanding of dispatchers, contexts, and operation cancellation.
• Structured concurrency — how to properly manage the coroutine lifecycle, avoiding memory leaks.
• Flow — reactive data streams: creation, transformation, error handling, and backpressure.
• Channel — inter-coroutine communication, channels of different types (Rendezvous, Buffered, Conflated).
• Parallelism and locks — working with Mutex, Semaphore, atomic operations, and thread-safe collections.
• Integration with frameworks — Ktor, Spring WebFlux, Android Architecture Components.
• Testing — how to write reliable tests for asynchronous code using kotlinx-coroutines-test.
• Advanced techniques — custom dispatcher, supervisor scope, coroutine scope in UI components.

Who is this book for?

• Junior developers — will master the basic concepts of asynchrony and learn to write non-blocking code.
• Middle developers — will deepen their knowledge, learn about pitfalls and performance optimization.
• Senior developers and architects — will find ready-made solutions for complex scenarios (data streams, custom schedulers, integration with reactive libraries).
• Android developers — will learn how to properly use coroutines in ViewModel, WorkManager, and Jetpack Compose.
• Backend developers — will see how to build high-load services on Ktor and Spring with a reactive approach.

What will you learn after reading?

• How the coroutine scheduler works and how Dispatchers.Default differs from Dispatchers.IO.
• Why GlobalScope is an anti-pattern and how to replace it.
• How to avoid race conditions without heavy locks.
• How to build data processing pipelines using Flow and Channel.
• How to debug asynchronous code using IntelliJ IDEA and the Kotlin Coroutines plugin.
• How to migrate existing callback-based code to coroutines without pain.

Each chapter contains practical examples ready for use in real projects. The code is available in a GitHub repository. The book is written in a lively style, with complex concepts explained through metaphors and analogies.

"Asynchronous Kotlin: The Complete Guide"