Book Image

Scala Design Patterns - Second Edition

By : Ivan Nikolov
Book Image

Scala Design Patterns - Second Edition

By: Ivan Nikolov

Overview of this book

Design patterns make developers’ lives easier by helping them write great software that is easy to maintain, runs efficiently, and is valuable to the company or people concerned. You’ll learn about the various features of Scala and will be able to apply well-known, industry-proven design patterns in your work. The book starts off by focusing on some of the most interesting and latest features of Scala while using practical real-world examples. We will be learning about IDE’s and Aspect Oriented Programming. We will be looking into different components in Scala. We will also cover the popular "Gang of Four" design patterns and show you how to incorporate functional patterns effectively. The book ends with a practical example that demonstrates how the presented material can be combined in real-life applications. You’ll learn the necessary concepts to build enterprise-grade applications. By the end of this book, you’ll have enough knowledge and understanding to quickly assess problems and come up with elegant solutions.
Table of Contents (14 chapters)

The singleton design pattern

The singleton design pattern ensures that a class has only one object instance in the entire application. It introduces a global state in the applications it is used in.

A singleton object can be initialized using different strategies—lazy initialization or eager initialization. This all depends on the intended use, the time it takes an object to be initialized, and so on.

An example class diagram

Singletons are another example of design patterns, which are supported out of the box by the Scala programming language syntax. We achieve this by using the object keyword. In this case, again, providing a class diagram is not necessary, so we will step right into the example in the next subsection...