RabbitMQ Essentials

David Dossot

• Éditeur: Packt Publishing
• Année: 2014
• ISBN:
  9781783983209
• Édition: 1
• Sujet: Informatica
• Sous-sujet: Informatica generale

In Detail

With the advent of cloud computing, the need to design and build applications that can meet the demand and complexity of the modern world has never been greater. RabbitMQ is above all other forms of Message Queuing software thanks to its loosely coupled architecture and its ability to bind multiple languages, making modern web applications secure, scalable, and simple to maintain. However, in order to implement the best design and development practices when developing your messaging applications, you will need proper guidance on how to use RabbitMQ effectively.

Armed with this supportive guide, you now have the opportunity to get immediately stuck into developing your own message-based applications with RabbitMQ. Using the fictitious Clever Coney Media as a case study, you will follow their journey of developing with RabbitMQ; from implementing simple, synchronous get operations to using advanced message routing and tracking the messaging application. With RabbitMQ Essentials, you get to observe how using Message Queuing software can streamline the development of your own distributed and scalable applications.

Once you have familiarized yourself with the RabbitMQ setup, you will soon be creating your own inbox to send and receive messages through the combination of user-specific queues as well as bound and direct exchanges. After extending your messaging system by developing your own public address system, you will learn how to analyze traffic through your own application using a Python client. If you have ever feared losing messages, prepare to be amazed once you discover how to deal with dead letters and message rejection. To round off this crash-course in RabbitMQ, you will finally learn how to track your application and prevent something disastrous occurring to it.

With so many other Message Queuing software available to you, RabbitMQ Essentials will show you precisely why RabbitMQ is leaps and bounds above the rest when it comes to building your own message-driven applications.

Approach

This book is a quick and concise introduction to RabbitMQ. Follow the unique case study of Clever Coney Media as they progressively discover how to fully utilize RabbitMQ, containing clever examples and detailed explanations.

Who this book is for

Whether you are someone who develops enterprise messaging products professionally or a hobbyist who is already familiar with open source Message Queuing software and you are looking for a new challenge, then this is the book for you. Although you should be familiar with Java, Ruby, and Python to get the most out of the examples, RabbitMQ Essentials will give you the push you need to get started that no other RabbitMQ tutorial can provide you with.

RabbitMQ Essentials

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Table of Contents

RabbitMQ Essentials

Credits

Foreword

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers and more

Why Subscribe?

Free Access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. A Rabbit Springs to Life

What is messaging?

A loosely coupled architecture

Meet AMQP

The RabbitMQ broker

A case for RabbitMQ

Getting RabbitMQ ready

Installing the broker

Installing the management plugin

Configuring users

Summary

2. Creating an Application Inbox

Connecting to RabbitMQ

Working with channels

Building the inbox

Sending user messages

AMQP message structure

Fetching user messages

Seeing it run

Adding topic messages

Summary

3. Switching to Server-push

Moving beyond polling

Consuming queues

Creating a consumer subscription wrapper

Babysitting subscriptions

Tying into the WebSocket endpoint

Running the application

Publishing to all queues

Binding to the fanout

Publishing to all

Running the application

Summary

4. Handling Application Logs

Publishing and consuming logs

Load testing AMQP

Running a load test

Prefetching messages

Messaging serendipity

Summary

5. Tweaking Message Delivery

Handling dead letters

Refactoring queues

Undertaking messages

Making delivery mandatory

Implementing the back-office sender

Summary

6. Smart Message Routing

Service-oriented messaging

Replying to queues

Routing service requests

Exposing the authentication service

Calling the authentication service

Summary

7. Taking RabbitMQ to Production

Tackling the broker SPOF

Mirroring queues

Connecting to the cluster

Federating brokers

Monitoring the broker

Summary

8. Testing and Tracing Applications

Testing RabbitMQ applications

Unit testing RabbitMQ applications

Integration testing RabbitMQ applications

Tracing RabbitMQ

Drinking at the Firehose

Summary

A. Message Schemas

User message

Authentication messages

Login

Request

Response

Logout

Request

Response

Generic error message

Index

RabbitMQ Essentials

Copyright © 2014 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: April 2014

Production Reference: 1180414

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78398-320-9

www.packtpub.com

Credits

Author

David Dossot

Reviewers

Ken Pratt

Ken Taylor

Ignacio Colomina Torregrosa

Héctor Veiga

Commissioning Editor

Ashwin Nair

Acquisition Editor

Richard Harvey

Content Development Editor

Govindan K

Technical Editors

Shruti Rawool

Nachiket Vartak

Copy Editors

Aditya Nair

Kirti Pai

Project Coordinator

Puja Shukla

Proofreader

Ameesha Green

Indexer

Monica Ajmera Mehta

Graphics

Sheetal Aute

Ronak Dhruv

Abhinash Sahu

Production Coordinator

Alwin Roy

Cover Work

Alwin Roy

Cover Image

Sheetal Aute

Foreword

What gets me most excited about RabbitMQ is that people keep finding new and better ways to use it. Messaging has truly come of age and stands beside databases and web applications as a technology that every professional developer needs to know.

In 2006, when RabbitMQ was born, messaging was mostly used by companies that had way too many IT systems and desperately needed some way to connect them. Jargon words such as "pubsub" and "queue" were strictly for messaging geeks and highly paid integration consultants. But the world was already changing and we were about to find out why.

Today's software and web applications are increasing in scale rapidly. There are more users, apps, devices, places, and ways to connect; this creates a burning need to build more scalable applications. At the same time, these new applications have to integrate with existing systems and services written using any language or API you care to think of. There is only one way to deliver scalability in this kind of environment: use messaging. The best way to do that is via a product such as RabbitMQ.

We started RabbitMQ because there was no messaging tool that was really powerful and dependable, yet easy to get started with. We decided to make one. We hope you like it.

The fun part is designing the tool so that you, the developer, feel like RabbitMQ is actually helping you to build better apps, instead of getting in the way. Your use of the tool should grow with your system.

The hard part is balancing simplicity and power. With RabbitMQ, we think we got this about right. Developers have little tolerance for complexity and nonsense. But beware! There is such a thing as "fake simplicity"; if a tool makes promises that seem too good to be true, then something is almost certainly broken. A truly simple system makes its capabilities obvious when they are needed. RabbitMQ will never lie to you or conceal its true behavior and we think this is essential in a good tool.

In this book, David Dossot has shown how messaging can help anyone architect and design solid scalable apps and how RabbitMQ can deliver on this promise. In 2014, everyone can grok the basics of messaging. Read this book to get started.

Alexis Richardson

Former CEO, Rabbit Technologies Inc.

About the Author

David Dossot has worked as a software engineer and an architect for more than 18 years. He has been using RabbitMQ since 2009 in a variety of different contexts. He is the main contributor to the AMQP transport for Mule. His focus is on building distributed and scalable server-side applications for the JVM and the Erlang VM. He is a member of IEEE, the Computer Society, and AOPA, and holds a diploma in Production Systems Engineering from ESSTIN.

He is a co-author for the first and second editions of Mule in Action (Manning Publications Co.). He is a Mule champion and a DZone Most Valuable Blogger. He commits on multiple open source projects and likes to help people on Stack Overflow. He's also a judge for the annual Jolt Awards software competition.

I would like to thank my wife for giving the thumbs up to this book project, while just recovering from the previous book. It was a stretch goal, but with her support and the patience and love of the rest of my family, it became possible. I'm also grateful to the rainy winters we get in the Pacific Northwest as I didn't feel bad staying inside writing!

I would like to extend a special thanks to our early reviewers—without them, the book wouldn't be as great as it is now. I want to use this opportunity to give kudos to a bunch of first class software engineers and architects who have inspired me and from whom I've learned so much throughout my career: Romuald van...