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The code that reflects the contents of this book is available in the Source Code area of the Apress website (www.apress.com). For the latest version of the framework and the example application, visit www.lhotka.net/cslanet/download.aspx.
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You may reach Rockford Lhotka on his website, www.lhotka.net, which contains his blog, information about the framework and book, and his contact information.
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bject-oriented design and programming are big topics entire books are devoted solely to the process of object-oriented design or to using object-oriented programming in various languages and on various programming platforms. My focus in this book isn t to teach the basics of objectoriented design or programming but rather to show how you may apply them to the creation of distributed .NET applications. It can be difficult to apply object-oriented design and programming effectively in a physically distributed environment. This chapter is intended to provide a good understanding of the key issues surrounding distributed computing as it relates to object-oriented development. I ll cover a number of topics, including the following: How logical n-layer architectures help address reuse and maintainability How physical n-tier architectures impact performance, scalability, security, and fault tolerance The difference between data-centric and object-oriented application models How object-oriented models help increase code reuse and application maintainability The effective use of objects in a distributed environment, including the concepts of anchored and mobile objects The relationship between an architecture and a framework This chapter provides an introduction to the concepts and issues surrounding distributed object-oriented architecture. Then, throughout this book, I ll be exploring an n-layer architecture that may be physically distributed across multiple machines. I ll show how to use object-oriented design and programming techniques to implement a framework supporting this architecture. I ll create a sample application that demonstrates how the architecture and the framework support development efforts.
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In today s world, an object-oriented application must be designed to work in a variety of physical configurations. Even the term application has become increasingly blurry because of all the hype around service-oriented architecture (SOA). If you aren t careful, you can end up building applications by combining several applications, which is obviously confusing. When I use the term application in this book, I m referring to a set of code, objects, or components that s considered to be part of a single, logical unit. Even if parts of the application are in different .NET assemblies or installed on different machines, all the code will be viewed as being part of a singular application. This definition works well when describing most traditional application models, such as singletier or 2-tier rich client applications, n-tier smart client applications, web applications, and so forth.
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CHAPTER 1 DIS TRIBUTED ARC HITE CTURE
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In all those cases, the application consists of a set of objects or components that are designed to work together within the context of the application. You can contrast this with an SOA model, where multiple services (each essentially a separate application) interact through message-based communication. In an SOA model, the idea is to build an enterprise system that is composed of applications and services. In this context, both applications and services are stand-alone, autonomous units of functionality, which means they both meet the definition of an application. Confusingly enough, this means a service is merely an application that has an XML interface instead of an HTML or graphical interface. If you re thinking about service-oriented systems as you read this book, the term application means one of two things. First, it may refer to a service implementation. Second, it may refer to an application on the edge of the system that allows users to interact with the system. Edge applications are much like traditional applications, except they typically interact with services instead of databases for retrieving and storing data. You can contrast the traditional and SOA models with a workflow model, which you re likely to encounter when using Windows Workflow Foundation (WF). In this environment, an application is often implemented (in whole or part) in the form of a workflow. However, the workflow itself merely orchestrates a set of activities, and each activity should be an autonomous, stand-alone unit of functionality. This means that an activity must meet the definition of an application. An activity is merely an application that has no real user interface beyond the data binding infrastructure built into WF. Traditional, service-oriented applications and workflow applications might run on a single machine. However, it s very likely that they will run on multiple machines, such as a web server or a smart client and an application server. Given these varied physical environments, you re faced with the following questions: Where do the objects reside Are the objects designed to maintain state, or should they be stateless How is object-relational mapping handled when retrieving or storing data in the database How are database transactions managed Before discussing some answers to these questions, it s important that you fully understand the difference between a physical architecture and a logical architecture. After defining these terms, I ll define objects and mobile objects and show you how they fit into the architectural discussion. When most people talk about n-tier applications, they re talking about physical models in which the application is spread across multiple machines with different functions: a client, a web server, an application server, a database server, and so on. And this isn t a misconception these are indeed n-tier systems. The problem is that many people tend to assume there s a one-to-one relationship between the layers (tiers) in a logical model and the tiers in a physical model, when in fact that s not always true. A physical n-tier architecture is quite different from a logical n-layer architecture. An n-layer architecture has nothing to do with the number of machines or network hops involved in running the application. Rather, a logical architecture is all about separating different types of functionality. The most common logical separation is into an Interface layer, a Business layer, and a Data layer. These layers may exist on a single machine or on three separate machines the logical architecture doesn t define those details.
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Note There is a relationship between an application s logical and physical architectures: the logical architecture always has at least as many layers as the physical architecture has tiers. There may be more logical layers than physical tiers (because one physical tier can contain several logical layers), but never fewer.
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