Book Image

Game Development Patterns with Unity 2021 - Second Edition

By : David Baron
Book Image

Game Development Patterns with Unity 2021 - Second Edition

By: David Baron

Overview of this book

This book is written for every game developer ready to tackle the bigger picture and start working with advanced programming techniques and design patterns in Unity. Game Development Patterns with Unity 2021 is an introduction to the core principles of reusable software patterns and how to employ them to build components efficiently. In this second edition, you'll tackle design patterns with the help of a practical example; a playable racing game prototype where you’ll get to apply all your newfound knowledge. Notable updates also include a game design document (GDD), a Unity programming primer, and the downloadable source code of a complete prototype. Your journey will start by learning about overall design of the core game mechanics and systems. You’ll discover tried-and-tested software patterns to code essential components of a game in a structured manner, and start using classic design patterns to utilize Unity's unique API features. As you progress, you'll also identify the negative impacts of bad architectural decisions and understand how to overcome them with simple but effective practices. By the end of this Unity book, the way you develop Unity games will change – you’ll adapt a more structured, scalable, and optimized process that will help you take the next step in your career.
Table of Contents (22 chapters)
Sections 1: Fundamentals
Section 2: Core Patterns
Section 3: Alternative Patterns
About Packt

Understanding the Observer pattern

The core purpose of the Observer pattern is to establish a one-to-many relationship between objects in which one acts as the subject while the others take the role of observers. The subject then assumes the responsibility of notifying the observers when something inside itself changes and might concern them.

It's somewhat similar to a publisher and subscriber relationship, in which objects subscribe and listen for specific event notifications. The core difference is that the subject and observers are aware of each other in the Observer pattern, so they are still lightly coupled together.

Let's review a UML diagram of a typical implementation of the Observer pattern to see how this might work when implemented in code:

Figure 9.1 – UML diagram of the Observer pattern

As you can see, the Subject and the Observer both have respective interfaces that they implement, but the most important one to analyze is ISubject, which includes the...