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Go: Design Patterns for Real-World Projects

You're reading from   Go: Design Patterns for Real-World Projects Build production-ready solutions in Go using cutting-edge technology and techniques

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Product type Course
Published in Jun 2017
Publisher Packt
ISBN-13 9781788390552
Length 1091 pages
Edition 1st Edition
Languages
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Authors (3):
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Mario Castro Contreras Mario Castro Contreras
Author Profile Icon Mario Castro Contreras
Mario Castro Contreras
Mat Ryer Mat Ryer
Author Profile Icon Mat Ryer
Mat Ryer
Vladimir Vivien Vladimir Vivien
Author Profile Icon Vladimir Vivien
Vladimir Vivien
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Toc

Table of Contents (38) Chapters Close

Go: Design Patterns for Real-World Projects
Credits
Preface
Bibliography
1. A First Step in Go 2. Go Language Essentials FREE CHAPTER 3. Go Control Flow 4. Data Types 5. Functions in Go 6. Go Packages and Programs 7. Composite Types 8. Methods, Interfaces, and Objects 9. Concurrency 10. Data IO in Go 11. Writing Networked Services 12. Code Testing 13. Ready... Steady... Go! 14. Creational Patterns - Singleton, Builder, Factory, Prototype, and Abstract Factory Design Patterns 15. Structural Patterns - Composite, Adapter, and Bridge Design Patterns 16. Structural Patterns - Proxy, Facade, Decorator, and Flyweight Design Patterns 17. Behavioral Patterns - Strategy, Chain of Responsibility, and Command Design Patterns 18. Behavioral Patterns - Template, Memento, and Interpreter Design Patterns 19. Behavioral Patterns - Visitor, State, Mediator, and Observer Design Patterns 20. Introduction to Gos Concurrency 21. Concurrency Patterns - Barrier, Future, and Pipeline Design Patterns 22. Concurrency Patterns - Workers Pool and Publish/Subscriber Design Patterns 23. Chat Application with Web Sockets 24. Adding User Accounts 25. Three Ways to Implement Profile Pictures 26. Command-Line Tools to Find Domain Names 27. Building Distributed Systems and Working with Flexible Data 28. Exposing Data and Functionality through a RESTful Data Web Service API 29. Random Recommendations Web Service 30. Filesystem Backup 31. Building a Q&A Application for Google App Engine 32. Micro-services in Go with the Go kit Framework 33. Deploying Go Applications Using Docker 1. Good Practices for a Stable Go Environment

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.

Description

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.

Objectives

The Observer pattern is especially...

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