Book Image

Redis 4.x Cookbook

Book Image

Redis 4.x Cookbook

Overview of this book

Redis is considered the world's most popular key-value store database. Its versatility and the wide variety of use cases it enables have made it a popular choice of database for many enterprises. Based on the latest version of Redis, this book provides both step-by-step recipes and relevant the background information required to utilize its features to the fullest. It covers everything from a basic understanding of Redis data types to advanced aspects of Redis high availability, clustering, administration, and troubleshooting. This book will be your great companion to master all aspects of Redis. The book starts off by installing and configuring Redis for you to get started with ease. Moving on, all the data types and features of Redis are introduced in detail. Next, you will learn how to develop applications with Redis in Java, Python, and the Spring Boot web framework. You will also learn replication tasks, which will help you to troubleshoot replication issues. Furthermore, you will learn the steps that need to be undertaken to ensure high availability on your cluster and during production deployment. Toward the end of the book, you will learn the topmost tasks that will help you to troubleshoot your ecosystem efficiently, along with extending Redis by using different modules.
Table of Contents (21 chapters)
Title Page
Packt Upsell
Windows Environment Setup

Using PubSub

Publish-Subscribe (PubSub) is a classic messaging pattern which has a long history, as far back as 1987 according to Wikipedia. To explain it in simple terms, publishers, who want to publish the events, send messages to a PubSub channel, which delivers the events to each subscriber who has an interest in this channel. Many popular messaging middleware, like Kafka and ZeroMQ, take advantage of this pattern to build a message delivery system, and so does Redis. In this recipe, we'll explore the PubSub pattern of Redis.

Getting ready…

You need to finish the installation of the Redis Server as we described in the Downloading and Installing Redis recipe in Chapter 1Getting Started with Redis.

How to do it...

To show how to use PubSub, take a recommendation message-pushing system as an example.

Open three consoles to simulate two subscribers in console-A (SUBer-1) and console-B (SUBer-2), and also one publisher in console-C (PUBer):

  1. Subscribe the Chinese restaurant channel in SUBer1: