Book Image

Effective Concurrency in Go

By : Burak Serdar
Book Image

Effective Concurrency in Go

By: Burak Serdar

Overview of this book

The Go language has been gaining momentum due to its treatment of concurrency as a core language feature, making concurrent programming more accessible than ever. However, concurrency is still an inherently difficult skill to master, since it requires the development of the right mindset to decompose problems into concurrent components correctly. This book will guide you in deepening your understanding of concurrency and show you how to make the most of its advantages. You’ll start by learning what guarantees are offered by the language when running concurrent programs. Through multiple examples, you will see how to use this information to develop concurrent algorithms that run without data races and complete successfully. You’ll also find out all you need to know about multiple common concurrency patterns, such as worker pools, asynchronous pipelines, fan-in/fan-out, scheduling periodic or future tasks, and error and panic handling in goroutines. The central theme of this book is to give you, the developer, an understanding of why concurrent programs behave the way they do, and how they can be used to build correct programs that work the same way in all platforms. By the time you finish the final chapter, you’ll be able to develop, analyze, and troubleshoot concurrent algorithms written in Go.
Table of Contents (13 chapters)

Dealing with multiple streams

Many times, you have to coordinate between data coming from and going to multiple streams concurrently. A simple example would be a chat room server using WebSockets. Unlike standard HTTP, which is composed of request/response pairs, WebSockets use bidirectional communication over HTTP, so you can both read from and write to the same connection. They are ideal for long-running conversations between systems where both sides send and receive data, such as this chat room example. We will develop a chat room server that accepts WebSocket connections from multiple clients. The server will distribute a message it receives from a client to all the clients connected at that moment. For this purpose, we define the following message structure:

type Message struct {
    Timestamp time.Time
    Message   string
    From      string

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