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Learning NServiceBus - Second Edition
Learning NServiceBus - Second Edition

Learning NServiceBus - Second Edition: Build reliable and scalable distributed software systems using the industry leading .NET Enterprise Service Bus , Second Edition

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Learning NServiceBus - Second Edition

Chapter 2. Messaging Patterns

Sending messages is powerful, but it still assumes coupling between the sender and the receiver because the sender needs to know where to send the message. In this chapter, we'll first delve deeper into the concept of asynchronous messaging, and then explore the Publish/Subscribe model, and discover how publishing events allows us to decouple services from one another.

By the end of the chapter, we will have updated our solution from the previous chapter to publish an event once the user has been created, and then we will show how we can create multiple subscribers to add functionality to a system without requiring changes to the original publisher. Along the way, you'll learn the basics of messaging theory, eventual consistency, and Publish/Subscribe.

Commands versus events

In the previous chapter, the MVC website sent a command to the NServiceBus endpoint, commanding it to perform an action on its behalf. This is similar to a web service or any other Remote Procedure Call (RPC) style of communication. The message sender must necessarily know not only how to communicate with the receiver but also what it expects the server to do once it receives the message.

Note

A command is a message that can be sent from one or more logical senders and is processed by a single logical receiver.

The main difference between sending an NServiceBus command and an RPC request is that an RPC call will block the client until the server sends a response back. There is no way that the client can continue without the response. Sending an NServiceBus command, however, is completely asynchronous.

Eventual consistency

The asynchronous nature of one-way messages brings to the forefront the concept of eventual consistency, the notion that in a system with disconnected...

Events

If you compare the following definition with that of a command, which was defined earlier in the chapter, you will notice that they follow the same general premise, but the differences are very important.

Note

An event is a message that is published from a single logical sender, and is processed by one or more logical receivers.

A command can be sent by any number of different senders. An event is only published by one logical sender. Sending a command sends one copy of a message to one receiver, and that receiver is the only entity that can process that command. In contrast, when an event is published, a copy of that message may be sent to dozens or even hundreds of subscribers, or maybe none if there are no subscribers.

This has even broader implications. While a command is an order to do something in the future, an event is an announcement that something has already happened. This is why commands are often named in the imperative, such as DoSomethingNowPleaseCmd, while events are...

Message routing

Now that we've spoken about commands and events, it's a good time to discuss how NServiceBus routes messages. Message routing is handled completely by configuration, within the UnicastBusConfig section that we have seen only a bit of so far. By storing the mappings in the configuration allows us to test our system entirely on one machine, and then modify the configuration for a production scenario that uses multiple machines for processing.

Messages are routed by type, and the UnicastBusConfig section maps message types to the queues and machines that must process them. When defining types, we may specify an entire assembly name, which is what we have done so far. In that case, all messages within that assembly are associated with the same endpoint. We may also specify particular message classes by using their type name and assembly name together, but in a sufficiently complex system, this quickly becomes very difficult to manage. As an in-between option, you can...

Summary

In this chapter, we started by learning about messaging theory. You learned about the Fallacies of Distributed Computing and the CAP Theorem, and realized that although we cannot achieve full consistency in a distributed system, we can leverage the power of asynchronous messaging to achieve eventual consistency.

You then learned about the distinction between commands and events, how commands are sent by multiple senders but processed by a single logical receiver, and how events are published by only one logical publisher but received by one or more logical subscribers. You learned how we can use the Publish/Subscribe model to decouple business processes—by announcing that some business event has happened, and allowing subscribers to respond to it in whatever way they wish.

We then demonstrated this knowledge by publishing an event with NServiceBus, and then creating multiple subscribers for that event. You learned how to configure the message endpoint mappings so that NServiceBus...

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Description

If you are a .NET developer who wants to eliminate the problems related to defective third-party web service integration or batch job failures, then this is the book for you. It is also perfect for those of you who are new to NServiceBus and service-oriented architecture and would like to learn how you can streamline all of your development efforts.

Who is this book for?

If you are a .NET developer who wants to eliminate the problems related to defective third-party web service integration or batch job failures, then this is the book for you. It is also perfect for those of you who are new to NServiceBus and service-oriented architecture and would like to learn how you can streamline all of your development efforts.

What you will learn

  • Create systems that can be maintained and upgraded without downtime
  • Make your web service integrations reliable
  • Create code that automatically compensates for failures
  • Apply the principles of messaging theory and eventual consistency
  • Decouple and simplify business processes with Publish/Subscribe
  • Replace batch jobs with business processes that are reliable, adaptable, and testable
  • Create software that can scale horizontally as well as vertically
  • Monitor your software for health, performance, and adherence to SLAs
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Publication date : Jan 31, 2015
Length: 204 pages
Edition : 2nd
Language : English
ISBN-13 : 9781784392925
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Learning NServiceBus Sagas
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Learning NServiceBus - Second Edition
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MASTERING NSERVICEBUS AND PERSISTENCE
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Table of Contents

11 Chapters
1. Getting on the IBus Chevron down icon Chevron up icon
2. Messaging Patterns Chevron down icon Chevron up icon
3. Preparing for Failure Chevron down icon Chevron up icon
4. Hosting Chevron down icon Chevron up icon
5. Advanced Messaging Chevron down icon Chevron up icon
6. Sagas Chevron down icon Chevron up icon
7. Advanced Configuration Chevron down icon Chevron up icon
8. The Service Platform Chevron down icon Chevron up icon
9. Administration Chevron down icon Chevron up icon
10. Where to Go from Here? Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

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Damir Arh Mar 15, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book starts out with a short step-by-step tutorial for creating a simple distributed application using NServiceBus, but it quickly moves on to a more advanced overview of the platform as a whole and the principles it builds on. Although most of the book revolves around development, it doesn't constrain itself to it. Towards the end, operational topics are covered as well: application configuration, administration, monitoring, scaling; showing the scope of the platform, being much more than just a development framework.The author doesn't focus on NServiceBus alone; instead he gives quite a lot of attention to the basics of messaging and service buses, doing his best to provide incentives for a distributed application design. No matter the previous experience, by the end of the book the reader should be acquainted enough with NServiceBus, to recognize a project requiring it. When that happens, this introductory book won't be enough to get the job done. Still, once you've read it, it will be much easier to depend on other (mostly online) resources, listed in the book. I also like, how the author pointed out the most important changes in the latest version of NServiceBus, which will prove more than useful when reading older blog posts about it.Whether you're starting to learn about NServiceBus, considering the adoption of distributed architecture in a .NET framework based project, or just want to know what NServiceBus is about, you should read this book. You never know when this knowledge might give you a different perspective on the challenges in your daily work.
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jose luis del alamo Mar 30, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
All I can say about this book it's that how well it's written and how much I learnt and enyoyed reading it. Seriously, I usually get tired of reading a lot of code lines' examples in my technical readings, but this one was an interesting search of knowledge about SOA architecture and one particular approach among several ones.I read the introductory part, written by the NServiceBus tool creator, and I felt like to reading it inmediately. The expectation was kindly honored.The author put in place at the beginning, the tool and its enormous possibilities, and little by little he reels off the features from a SOA architecture point of view.The book is divided in 10 chapters, the first 4 show how to acomplish simple system with the more basic configuration. From chapter 5 come the ins and outs of the component to do the real work we usually demand on an production system. He covers advanced topics on messaging, administration, extensibility, long running process (sagas) and more. the main point is that he exposed everything detailing why we should do something, or why we won`t do things that way, giving as the confidence and realibility needed from a real proficient in NServiceBus. Maybe, it lacks of more code examples during the explanation, although, everything he treats is in the downloadable code.Definitively, a book that one interested in finish out with the old myths of SOA architecture and passionate with doping things better and functional, must have and read.
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RunStopRestore Aug 06, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a fantastic book for NServiceBus! Whether you are just learning (even if you don’t have previous experience with service bus architectures), or if you’re looking for a reference book for the bookshelf, this is the go-to book for NServiceBus. Additionally, it was a great price from the seller I got it from, and the book was in excellent condition. A good purchase all around.
Amazon Verified review Amazon
Stephen J. Brouillard Mar 10, 2015
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This book is an outstanding follow-up and improvement on the first edition.I originally purchased the first edition of this book about 8 months ago because I found myself on a project where NServiceBus was the best way to manage messaging between service components. I was generally happy with the first edition, but I found that the product was changing pretty rapidly then and the book was just far enough behind to make some of the implementation difficult. I had two other frustrations with the first edition. Because NServiceBus is both a platform (or an extension of a platform like MSMQ, depending on how you look at it) and a library on which to code. You need to understand, not only how to code to the patterns and APIs, but also how to manage and administer the platform. The first book was sorely lacking in this area. There was some information, but I found it a bit lacking in that regard. The other frustration I had was that at several points in the book, the sample projects skipped ahead in some of the concepts and didn't provide you a smooth path to take the project you ended with in one chapter to the beginning of the next. The downloaded code samples at that time also didn't include an appropriate starting point for the next chapter, just the final code. That made it a bit difficult to work through to the next concept without struggling.That's a lot of info on the first edition, but it sets the stage for why I like the second so much.Not only does the second edition cover the newer concepts and features in the latest edition of NServiceBus, but it also addresses many of the frustrations I had with the first addition. The examples and code samples flow much more smoothly from one to the next. I'm not 100% complete with the book yet, but at more than 75% done, I've seen where I had challenges before and find the new flow to be significantly improved. Beyond that, there's a great deal more information about managing the underlying platform. From what I've found, MSMQ is the most common platform on which NServiceBus runs. It's also the least well document option in terms of what can be found from Microsoft or third parties. There a good amount of space in this book dedicated to helping you manage the care and feeding of your NServiceBus platfrom, particularly MSMQ. While there's much less information on managing some of the other underlying platforms (RabbitMQ, for example), those platforms have entire books dedicated to implementing and managing them, so the resources are already available.As for new material, there's plenty. There's expanded coverage of existing principles moved over from the first edition. That coverage has also been updated to include the new APIs and patterns. There's also a good bit of coverage for the newer concepts and features, including expanded coverage of Sagas.Overall ab excellent effort and at this time, I would say that this is the definitive primer for the platform.
Amazon Verified review Amazon
Evelio Alonso Fuentes Mar 10, 2015
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The Packt Publishing latest book about NServiceBus is your key to being an expert in this useful technology.Packt Publishing's Learning NServiceBus Second Edition is a current book - it supports the actual NServiceBus version (version 5 +).First, David Boike provide an overview of NServiceBus. This would be useful for the NServiceBus beginner. Then he introduce the use of tools which is a practical way to start using this Enterprise Service Bus technology. Instructions are provided to enable hands on experience. In addition, sample code is provided by Particular Software to support hands on learning.The book teaches essential NServiceBus skills. There are a number of skill levels for Publish/Subscribe to build robust applications, build reliable message-driven systems that automatically compensate for system failure and example-oriented guide to building reliable and scalable systems with SOA principles.The chapter about Advanced Messaging is especially good and will help you to move from beginner to intermediate or advanced. Next, the book shows how to develop NServiceBus Sagas and how to develop Long-running business processes with NServiceBus.This is a very good reference book for anybody who has to work with NServiceBus, especially starting out. It goes through a lot of basics but has plenty of examples that can be easily found.
Amazon Verified review Amazon
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