Book Image

Go Design Patterns

By : Mario Castro Contreras
Book Image

Go Design Patterns

By: Mario Castro Contreras

Overview of this book

Go is a multi-paradigm programming language that has built-in facilities to create concurrent applications. Design patterns allow developers to efficiently address common problems faced during developing applications. Go Design Patterns will provide readers with a reference point to software design patterns and CSP concurrency design patterns to help them build applications in a more idiomatic, robust, and convenient way in Go. The book starts with a brief introduction to Go programming essentials and quickly moves on to explain the idea behind the creation of design patterns and how they appeared in the 90’s as a common "language" between developers to solve common tasks in object-oriented programming languages. You will then learn how to apply the 23 Gang of Four (GoF) design patterns in Go and also learn about CSP concurrency patterns, the "killer feature" in Go that has helped Google develop software to maintain thousands of servers. With all of this the book will enable you to understand and apply design patterns in an idiomatic way that will produce concise, readable, and maintainable software.
Table of Contents (17 chapters)
Go Design Patterns
About the Author
About the Reviewer
Customer Feedback

Observer design pattern

We will finish the common Gang of Four design patterns with my favorite: the Observer pattern, also known as publish/subscriber or publish/listener. With the State pattern, we defined our first event-driven architecture, but with the Observer pattern we will really reach a new level of abstraction.


The idea behind the Observer pattern is simple--to subscribe to some event that will trigger some behavior on many subscribed types. Why is this so interesting? Because we uncouple an event from its possible handlers.

For example, imagine a login button. We could code that when the user clicks the button, the button color changes, an action is executed, and a form check is performed in the background. But with the Observer pattern, the type that changes the color will subscribe to the event of the clicking of the button. The type that checks the form and the type that performs an action will subscribe to this event too.


The Observer pattern is especially...