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.

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Table of Contents (17 chapters)
Go Design Patterns
Go Design Patterns
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Ready... Steady... Go!
Ready... Steady... Go!
A little bit of history
Installing Go
Starting with Hello World
Integrated Development Environment - IDE
Types
Variables and constants
Operators
Flow control
Functions
Arrays, slices, and maps
Visibility
Zero-initialization
Pointers and structures
Interfaces
Testing and TDD
Libraries
The Go get tool
Managing JSON data
Go tools
Contributing to Go open source projects in GitHub
Summary
2
Creational Patterns - Singleton, Builder, Factory, Prototype, and Abstract Factory Design Patterns
Creational Patterns - Singleton, Builder, Factory, Prototype, and Abstract Factory Design Patterns
Singleton design pattern - having a unique instance of a type in the entire program
Builder design pattern - reusing an algorithm to create many implementations of an interface
Factory method - delegating the creation of different types of payments
Abstract Factory - a factory of factories
Prototype design pattern
Summary
3
Structural Patterns - Composite, Adapter, and Bridge Design Patterns
Structural Patterns - Composite, Adapter, and Bridge Design Patterns
Composite design pattern
Adapter design pattern
Bridge design pattern
Summary
4
Structural Patterns - Proxy, Facade, Decorator, and Flyweight Design Patterns
Structural Patterns - Proxy, Facade, Decorator, and Flyweight Design Patterns
Proxy design pattern
Decorator design pattern
Facade design pattern
Flyweight design pattern
Summary
5
Behavioral Patterns - Strategy, Chain of Responsibility, and Command Design Patterns
Behavioral Patterns - Strategy, Chain of Responsibility, and Command Design Patterns
Strategy design pattern
Chain of responsibility design pattern
Command design pattern
Summary
6
Behavioral Patterns - Template, Memento, and Interpreter Design Patterns
Behavioral Patterns - Template, Memento, and Interpreter Design Patterns
Template design pattern
Memento design pattern
Interpreter design pattern
Summary
7
Behavioral Patterns - Visitor, State, Mediator, and Observer Design Patterns
Behavioral Patterns - Visitor, State, Mediator, and Observer Design Patterns
Visitor design pattern
State design pattern
Mediator design pattern
Observer design pattern
8
Introduction to Gos Concurrency
Introduction to Gos Concurrency
A little bit of history and theory
Goroutines
Callbacks
Mutexes
Channels
Using it all - concurrent singleton
Summary
9
Concurrency Patterns - Barrier, Future, and Pipeline Design Patterns
Concurrency Patterns - Barrier, Future, and Pipeline Design Patterns
Barrier concurrency pattern
Future design pattern
Pipeline design pattern
Summary
10
Concurrency Patterns - Workers Pool and Publish/Subscriber Design Patterns
Concurrency Patterns - Workers Pool and Publish/Subscriber Design Patterns
Workers pool
Concurrent Publish/Subscriber design pattern
Summary

Memento design pattern

Let's now look at a pattern with a fancy name. If we check a dictionary to see the meaning of memento, we will find the following description:

"An object kept as a reminder of a person or event."

Here, the key word is reminder as we will remember actions with this design pattern.

Description

The meaning of memento is very similar to the functionality it provides in design patterns. Basically, we'll have a type with some state and we want to be able to save milestones of its state. Having a finite amount of states saved, we can recover them if necessary for a variety of tasks-undo operations, historic, and so on.

The Memento design pattern usually has three players (usually called actors):

  • Memento: A type that stores the type we want to save. Usually, we won't store the business type directly and we provide an extra layer of abstraction through this type.

  • Originator: A type that is in charge of creating mementos and storing the current active state. We said that the Memento...

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