Book Image

Go: Design Patterns for Real-World Projects

By : Vladimir Vivien, Mario Castro Contreras, Mat Ryer
Book Image

Go: Design Patterns for Real-World Projects

By: Vladimir Vivien, Mario Castro Contreras, Mat Ryer

Overview of this book

The Go programming language has firmly established itself as a favorite for building complex and scalable system applications. Go offers a direct and practical approach to programming that lets programmers write correct and predictable code using concurrency idioms and a full-featured standard library. This practical guide is full of real-world examples to help you get started with Go in no time at all. You’ll start by understanding the fundamentals of Go, then get a detailed description of the Go data types, program structures, and Maps. After that, you’ll learn how to use Go concurrency idioms to avoid pitfalls and create programs that are exact in expected behavior. Next, you will get familiar with the tools and libraries that are available in Go to write and exercise tests, benchmarking, and code coverage. After that, you will be able to utilize some of the most important features of GO such as Network Programming and OS integration to build efficient applications. Then you’ll start applying your skills to build some amazing projects in Go. You will learn to develop high-quality command-line tools that utilize the powerful shell capabilities and perform well using Go’s built-in concurrency mechanisms. Scale, performance, and high availability lie at the heart of our projects, and the lessons learned throughout the sections will arm you with everything you need to build world-class solutions. You will get a feel for app deployment using Docker and Google App Engine. Each project could form the basis of a start-up, which means they are directly applicable to modern software markets. With these skills in hand, you will be able to conquer all your fears of application development and go on to build large, robust and succinct apps in Go. This Learning Path combines some of the best that Packt has to offer in one complete, curated package. It includes content from the following Packt products: 1. Learning Go Programming 2. Go Design Patterns 3. Go Programming Blueprints, Second Edition
Table of Contents (38 chapters)
Go: Design Patterns for Real-World Projects
Credits
Preface
Bibliography

Workers pool


One problem we may face with some of the previous approaches to concurrency is their unbounded context. We cannot let an app create  an unlimited amount of Goroutines. Goroutines are light, but the work they perform could be very heavy. A workers pool helps us to solve this problem.

Description

With a pool of workers, we want to bound the amount of Goroutines available so that we have a deeper control of the pool of resources. This is easy to achieve by creating a channel for each worker and having workers with either an idle or busy status. The task can seem daunting, but it's not at all.

Objectives

Creating a Worker pool is all about resource control: CPU, RAM, time, connections, and so on. The workers pool design pattern helps us to do the following:

  • Control access to shared resources using quotas

  • Create a limited amount of Goroutines per app

  • Provide more parallelism capabilities to other concurrent structures

A pool of pipelines

In the previous chapter, we saw how to work with a...