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 Event Bus pattern

When an event is raised by an object (publisher), it sends out a signal that other objects (subscribers) can receive. The signal is in the form of a notification that can indicate the occurrence of an action. In an event system, an object broadcasts an event. Only those objects that subscribe to it will be notified and choose how to handle it. So, we can imagine it as having a sudden burst of a radio signal that only those with antennas tuned to a specific frequency can detect.

The Event Bus pattern is a close cousin of the Messaging system and Publish-Subscribe patterns, the latter being the more accurate name for what the Event Bus does. The keyword in the title of this pattern is the term bus. In simple computing terms, a bus is a connection between components. In the context of this chapter, the components will be objects that can be publishers or listeners of events.

Hence, the Event Bus is a way to connect objects through events by using a publish...