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 abstract factory

The abstract factory is another design pattern from the family of factory patterns. The purpose is the same as all factory design patterns—to encapsulate the object creation logic and hide it from the user. The difference is how it is implemented.

The abstract factory design pattern relies on object composition in contrast to inheritance, which is used by the factory method. Here, we have a separate object, which provides an interface to create instances of the classes we need.

An example class diagram

Let's keep using the preceding SimpleConnection example here. The following diagram shows how the abstract factory is structured:

As we can see from the preceding diagram, now we have a hierarchy...