Book Image

RabbitMQ Essentials. - Second Edition

By : Lovisa Johansson, David Dossot
Book Image

RabbitMQ Essentials. - Second Edition

By: Lovisa Johansson, David Dossot

Overview of this book

RabbitMQ is an open source message queuing software that acts as a message broker using the Advanced Message Queuing Protocol (AMQP). This book will help you to get to grips with RabbitMQ to build your own applications with a message queue architecture. You’ll learn from the experts from CloudAMQP as they share what they've learned while managing the largest fleet of RabbitMQ clusters in the world. Following the case study of Complete Car, you’ll discover how you can use RabbitMQ to provide exceptional customer service and user experience, and see how a message queue architecture makes it easy to upgrade the app and add features as the company grows. From implementing simple synchronous operations through to advanced message routing and tracking, you’ll explore how RabbitMQ streamlines scalable operations for fast distribution. This book will help you understand the advantages of message queue architecture, including application scalability, resource efficiency, and user reliability. Finally, you’ll learn best practices for working with RabbitMQ and be able to use this book as a reference guide for your future app development projects. By the end of this book, you’ll have learned how to use message queuing software to streamline the development of your distributed and scalable applications.
Table of Contents (8 chapters)

Sending responses to the publisher

It is true that all of our interactions with RabbitMQ so far have been one way and asynchronous. It is also true that clients interacting with a service usually expect to receive a response. Reversing the publisher and consumer roles in the response phase requires the client to act as a publisher and the service as a consumer.

Different queues are used for requests and responses, as demonstrated in Chapter 2, Creating a Taxi Application, and illustrated in the following diagram:

Fig 5.1: A request-response interaction performed with message queues

In the following diagram, Fig 5.2, we can see the following:

  • When a taxi driver confirms a booking request, a message is sent to the message broker with information about the driver (5).
  • The application service receives the message (6), stores the information in the database (7), and confirms the booking with the mobile application, which is ultimately shown to the customer (8).
  • At this point, the taxi needs...