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

Future design pattern

The Future design pattern (also called Promise) is a quick and easy way to achieve concurrent structures for asynchronous programming. We will take advantage of first class functions in Go to develop Futures.


In short, we will define each possible behavior of an action before executing them in different Goroutines. Node.js uses this approach, providing event-driven programming by default. The idea here is to achieve a fire-and-forget that handles all possible results in an action.

To understand it better, we can talk about a type that has embedded the behavior in case an execution goes well or in case it fails.

In the preceding diagram, the main function launches a Future within a new Goroutine. It won't wait for anything, nor will it receive any progress of the Future. It really fires and forgets it.

The interesting thing here is that we can launch a new Future within a Future and embed as many Futures as we want in the same Goroutine (or new ones). The idea...