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The book starts by examining the forces that come to bear on the design of a distributed application. This chapter is high level, but it sets the stage for the specific technical discussions that follow by taking a look at what influences the decisions you need to make about the technology choices available for a distributed application. There are many resources available to help you with specific technologies, in isolation from the rest of your application. In this chapter, we look at how the specific requirements in your environment get mapped to the selection of specific technical infrastructures. We follow up by examining some sample solutions and discussing how they meet specific requirements.
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Here we step out of the world of ASP.NET Web Form processing and examine the larger infrastructure that this request processing exists within. This is the same pipeline used by Web Services, and it is the same pipeline that will be used by Windows Communication Foundation (WCF). It is also built for extensibility, meaning you can do your own type of request processing by customizing this pipeline.
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Understanding this request-processing pipeline is the key to understanding many important aspects of distributed application development, both now and for future applications. In this chapter, you ll see how requests are moved from IIS to a specific handler, how this pipeline can be extended, and how you can add your own handlers for custom request processing.
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This chapter focuses solely on the System.Web.UI.Page class, the fundamental type for Web Form programming. Here we peel the covers back on this type, and examine its internal structure: the control tree, which is fundamental to all ASPX request processing. We ll also show you some changes that have been made to this model in ASP.NET 2.0, including a new compilation model, new deployment options, and some new events available in the lifetime of the page-request processing.
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This chapter focuses on some of the more subtle communication that occurs between the web server and the web browser in ASP.NET request processing. We ll look specifically at the ViewState, enhancements to the scripting model that ease the generation of client-side JavaScript, and an amazing new feature that allows for out-of-band asynchronous callbacks from a web browser to the web server. This set of features focuses on how to maximize the power and flexibility you have when creating applications within the confines of a web browser. The capabilities afforded by this set of features are seldom fully utilized. The callback feature is especially important, as it is cross-browser-compatible and has the potential to take web application development to the next level by giving the developer the ability to do a partial page refresh, creating a more responsive and usable interface for the user.
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Overview of .NET Application Architecture
ET is complex. Not so much in the same way that COM is complex. Not in the way that makes you want to cry as you realize you re going to have to scrub the registry for references to an old version of a COM server again. Not in the way that gives you nightmares about ghoulish GUIDs taunting you from a misplaced type library. No, .NET s complexity is based more on its sheer size and scale. There are more than 3,000 types in the Framework class library, and these types are designed to do just about anything. The major learning curve to becoming productive in the .NET Framework is not the language, regardless of your language of choice (although moving from VBScript to VB .NET Web Forms has been challenging for more than a few); it s the Framework class library. It calls to question, What s out there When do I use it How does it work Distributed applications are also complex. A layered architecture results in an application with a lot of moving parts. Simply displaying a data point within a web browser can involve using an object graph with dozens of instances, a call stack that s easily five layers deep, code involving markup, one or more managed languages, Structured Query Language (SQL), and maybe even a proprietary database language such as Transact SQL (TSQL). The path of this stack may span processes, machines within a LAN, platforms and operating systems, and maybe even several LANs. As the architect, you have the task of designing the path of these requests and the rules of interaction for each step of the way. You ll need to consider more than the business-based, functional requirements. When you re designing the architecture, functional requirements may be relevant, but they re usually secondary to other application requirements, which aren t captured in the Use Cases. You ll also need to address a multitude of questions: What are the scalability requirements for the application How available must the application be, and how will someone know when it s down Is it customizable, and if so, when and by whom Is it easy to deploy, upgrade, and maintain over time Are there development cost constraints What connectivity mechanisms will it employ (i.e., will users be fully connected, be partially connected/mobile, use PDAs, etc.)
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