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)

Publishing to all queues

With the new feature request in hand, the CC programming team came up with the new overall messaging architecture shown in the following diagram. The back-office application will be connected to RabbitMQ in order to publish information messages to all taxi drivers:

Fig 3.3: Back-office application in the architecture

To roll this out, one way could be to use the topic messaging that's already in place and create a special topic to which all drivers would be subscribed. However, there is an even cleaner and simpler approach offered by the AMQP protocol – fanout exchange.

Fanout exchange

Fanout exchange takes all messages that are coming in and delivers them to all queues that are bound to it. An easy-to-understand example of where to use a fanout is when messages need to be spread between many participants, like in a chat (however, there are probably better choices for pure chat applications).

Other examples include the following:

  • Score board or...