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Kotlin Design Patterns and Best Practices

Kotlin Design Patterns and Best Practices - Second Edition

By : Alexey Soshin
4.5 (13)
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Kotlin Design Patterns and Best Practices

Kotlin Design Patterns and Best Practices

4.5 (13)
By: Alexey Soshin

Overview of this book

This book shows you how easy it can be to implement traditional design patterns in the modern multi-paradigm Kotlin programming language, and takes you through the new patterns and paradigms that have emerged. This second edition is updated to cover the changes introduced from Kotlin 1.2 up to 1.5 and focuses more on the idiomatic usage of coroutines, which have become a stable language feature. You'll begin by learning about the practical aspects of smarter coding in Kotlin, as well as understanding basic Kotlin syntax and the impact of design patterns on your code. The book also provides an in-depth explanation of the classical design patterns, such as Creational, Structural, and Behavioral families, before moving on to functional programming. You'll go through reactive and concurrent patterns, and finally, get to grips with coroutines and structured concurrency to write performant, extensible, and maintainable code. By the end of this Kotlin book, you'll have explored the latest trends in architecture and design patterns for microservices. You’ll also understand the tradeoffs when choosing between different architectures and make informed decisions.
Table of Contents (17 chapters)
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1
Section 1: Classical Patterns
6
Section 2: Reactive and Concurrent Patterns
11
Section 3: Practical Application of Design Patterns

Jobs

The result of running an asynchronous task is referred to as a job. Just as the Thread object represents an actual OS thread, the Job object represents an actual coroutine.

For instance, consider the following function that initiates a coroutine to generate a universally unique identifier (UUID) asynchronously and returns it:

fun fastUuidAsync() = GlobalScope.async { 
    UUID.randomUUID() 
}

However, if we execute this code from our main method, it won’t print the expected UUID value. Instead, it will produce a result similar to the following:

> DeferredCoroutine{Active} 

The object returned from a coroutine is known as a job. Now, let’s explore what a job is and how to use it correctly.

To illustrate this concept, consider the following code snippet:

fun main() {
    runBlocking {
        val job: Deferred<UUID> = fastUuidAsync()
        println(job.await())
    }
}

A job has a simple life cycle and can be in one of...

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