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Learning NServiceBus Sagas
Learning NServiceBus Sagas

Learning NServiceBus Sagas: Discover how to design, build, and test sagas and messaging with NServiceBus

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Learning NServiceBus Sagas

Chapter 2. NServiceBus Saga Architecture

We have briefly touched upon sagas in the previous chapter, and in this chapter, we will go into more detail. We will discuss timeouts, message handling, and persistence for sagas. In this chapter, we will cover:

  • Transition from NServiceBus (NSB) version 4 to version 5
  • Message flow
  • Deployment
  • Insight

Upgrading from NSB version 4 to 5

In the later part of September 2014, NServiceBus introduced version 5.0, an upgrade from version 4.x. NSB version 5.0 requires different coding techniques. Currently, NSB is in version 5.02, which offers many features. These are as follows:

  • Non-DTC operations: These support durable messaging in cloud queues and other queuing systems, such as RabbitMQ, which do not support local transaction management. Version 5 has been modified to provide additional support for integration into Windows Azure queues.
  • ISendOnlyBus: This simplifies the ability to create a configuration just for the purpose of sending messages only to the bus. The function used will look like this: var bus = Bus.CreateSendOnly(configuration).
  • Bus.Create(new BusConfiguration()): The bus configuration in version 5.0 is different from version 4 as it supports the bus configuration object that is passed around through functions, as there can be different bus configurations used for different reasons...

The saga workflow

The purpose of the saga is to provide workflow. It provides the persistence of the saga data so that a message can return to the saga and have a point of reference to the original messages.

The source code in this section is in the CreditCardApproval – v5 section. It was compiled in Visual Studio 2012 using NSB Version 5.0. The projects will appear as the following:

The saga workflow

Here we have the following projects:

  • AppCommon: This contains the ViewModel and Context for the Windows forms.
  • AppForAccountingDept: This receives a purchase order number related to the approval of the credit card.
  • CreditCardApproval: This approves the credit card.
  • CreditCardSubmit: This submits the credit card for approval.
  • CreditCardMessages: This contains the common messages for the projects.
  • CreditCardSaga: This is the credit card saga that directs the workflow and message routing by using message handling and saga data.

The flow of the messages, which does all the work (thus, workflow), will start with the...

Deployment

All applications are executable, except the saga, which we developed as a DLL because of the use of NServiceBus.Host.exe. This is a program and package from NSB to provide hosted deployment from NSB, in which we can install the DLL as a managed service and add endpoints and many other features that NSB hosts bring to the table. When we debug the program, we start the saga DLL using the NServiceBus.Host.exe program. See the following project properties:

Deployment

To run the program as a console application, we could simply use NServiceBus.Host.exe CreditCardSaga.dll as shown in the following screenshot:

Deployment

We could also use the NServiceBus.Host.exe\install to install the program as an NSB-managed service. For more details on NSB hosting, please visit http://docs.particular.net/nservicebus/the-nservicebus-host. Next, let's look at the insight.

ServiceInsight

We covered the topic of architecture using some basic tools to view the MSMQ as the messages were flowing. NSB offers ServiceInsight that can offer much more insight to the flow and execution of messages, endpoints, and services. In order to view the messages, we have to install ServiceInsight on the machine along with ServiceControl, and add the ServiceControl debugging and saga packages to the saga project. We will need to add service control to the other projects if we wish to view them as well. In this instance, we will just add service control debug and saga to CreditCardSaga. We will add references through NuGet to appear as in the following screenshot:

ServiceInsight

After adding service control to the project, which we will call CreditCardApprove - v5 – ServiceInsight, we can get detailed information on the saga and its messages through ServiceInsight, which will look similar to what is seen in the following screenshot:

ServiceInsight

Summary

We have discussed moving sagas from version 4.0 to version 5.0. Version 5.0 has many more tools and packages that are geared towards Windows Azure, Visual Studio 2012, and .NET 4.5. This enables greater compatibility with Azure development and testing, as well as using Azure SDK tools, and the many tools that Visual Studio 2012 provides. This is definitely a positive sign in the evolution of a saga with Windows cloud computing.

We discussed a credit card approval sample using a saga service and saga data. This example could be used in multiple scenarios: from using the WCF service of a bank to deduct from a credit card to ordering from a catalog. The messages, endpoints, and services are managed by NSB as it maps the state of the messages and ensures their durability. The message flow is an important concept as messages can be sent to different business divisions for their business applications, or handled as separate processes, just as we used an accounting department application...

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Description

If you are an Enterprise C# developer who wishes to extend your knowledge of NServiceBus and Enterprise Service Bus in C#, this is the book for you. This book is designed to enhance the education of ESBs and their messaging, whether you are a beginner or a seasoned expert in Enterprise C#, Apex, and Visualforce pages.

Who is this book for?

If you are an Enterprise C# developer who wishes to extend your knowledge of NServiceBus and Enterprise Service Bus in C#, this is the book for you. This book is designed to enhance the education of ESBs and their messaging, whether you are a beginner or a seasoned expert in Enterprise C#, Apex, and Visualforce pages.

What you will learn

  • Design, develop, monitor, and test messaging and sagas using NSB platform tools
  • Familiarize yourself with the architecture of NSB from a conceptual aspect
  • Decouple ASP.NET frontend to backend services through messaging using design patterns in NSB
  • Get to grips with saga properties and its work flow
  • Integrate endpoints into web services
  • Understand the basics of IBus and configure it
  • Configure, code, and deploy NServiceBus frameworks and APIs in Visual Studio
  • Combine NSB with nonC# solutions such as cloudbased solutions
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 30, 2015
Length: 214 pages
Edition : 1st
Language : English
ISBN-13 : 9781782173496

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Product Details

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Length: 214 pages
Edition : 1st
Language : English
ISBN-13 : 9781782173496

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Learning NServiceBus Sagas
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MASTERING NSERVICEBUS AND PERSISTENCE
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Table of Contents

7 Chapters
1. Introduction to Sagas Chevron down icon Chevron up icon
2. NServiceBus Saga Architecture Chevron down icon Chevron up icon
3. The Particular Service Platform Chevron down icon Chevron up icon
4. Saga Development Chevron down icon Chevron up icon
5. Saga Snippets Chevron down icon Chevron up icon
6. Using NServiceBus in the Cloud Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
(2 Ratings)
5 star 50%
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1 star 50%
Stephen J. Brouillard Mar 11, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Learning NServiceBus Sagas is an excellent companion and continuation of the Learn NServiceBus Second Edition book from the same publisher.If you find yourself working in a ServiceBus architecture and discover that you need to implement long-lived transactions, then an NServiceBus Saga may be the solution to your problem.Learn NServiceBus Sagas takes a deep dive into sagas. It describes the kinds of patterns one might need to use in a Service Oriented Architecture (SOA), how those patterns are implemented with NServiceBus, and how Sagas fit into those patterns. It goes on to describe the Particular Service Platform and how that set of tools help you manage, debug, and build Sagas. From there the book does an excellent job of taking the reader through the process of developing sagas, both in terms of developing end-to-end from scratch and using Sagas to "coordinate" existing services with NServiceBuse The next chapter takes you through a couple of excellent realistic examples of using Sagas to tie it all together. The final chapter gives you a good introduction to using NServiceBus in the cloud with MS Azure.
Amazon Verified review Amazon
Damir Arh Apr 05, 2015
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
In spite of the introductory chapter, the reader should already be familiar in advance with the concepts of an enterprise service bus and the patterns related to it, as well as with the basics of NServiceBus. Also the book is not focused only on sagas at all; it gets distracted by many other technologies, such ASP.NET MVC, WCF, Microsoft Azure and others, not really telling much about any of them either.The samples are very contrived and almost impossible to make sense of by just reading the book, because their crucial parts are not explained and can only be found in the accompanying download file. Not even the basic functionality and structure of sagas is properly explained, much less any advanced concepts and usage scenarios. On the other hand; just to prove how simple it is to change the transport from MSMQ to other queuing technologies, the process is described 5 times in different parts of the book, making NServiceBus use RabbitMQ, ActiveMQ (twice), Azure Storage Queues and Azure Service Bus, instead.The content is not well structured; the author keeps jumping from one topic to the other, often repeating himself, which makes the book very difficult to follow. On top of that, the text is occasionally even misguiding; e.g. unit testing (much less TDD) is not about initially writing the code in a test and then copying it to its correct location. I can't really recommend the book to anyone. It's just a waste of time and money. You'll learn more by reading the official documentation and blog posts on the topic.
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