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CHAPTER 8 HOSTING AND COMMUNICATIONS
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Figure 8-10. Exposing Serviced Components via multiple hosts and protocols ASP .NET should be your first choice as a listener because it can deal with requests for Web Services, can handle requests for remoted objects, can expose Enterprise Services, and can be used in concert with MSMQ. Microsoft is attempting to simplify this entire landscape with the WCF. In the next chapter, we examine the WCF and see how it will reign in some of this complexity.
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CHAPTER
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Windows Communication Foundation
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ot too long ago, many web applications were deployed as a single unit on a single machine. That is, the presentation, business, and data access logic all executed on the same machine and within the same process. Typically, only the database server would be on a different physical machine. As business needs became more and more complex, however, businesses required more out of their web applications more performance, more scalability, more flexibility, and more integration with other systems. This, in turn, has lead to the present era, where a given web application may need to communicate with several applications running on a variety of different machines and platforms. In 5, we discussed the distributed technologies that .NET currently provides to help you meet these challenges. In this chapter, however, we look at a future distributed technology Windows Communication Foundation (WCF) that will eventually supersede the technologies of today.
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Introducing Windows Communication Foundation
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To begin, we describe the nature of the new technology and why it is different from the current set of technologies. Then we dive into some of the issues surrounding the current distributed technologies to establish why something this unique was required in the first place.
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What Is Windows Communication Foundation
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Windows Communication Foundation (WCF) is Microsoft s next-generation distributed systems technology. It provides a single API and a single infrastructure on which you can build, deploy, and operate distributed applications WCF takes the best features from the existing .NET distributed technologies and unifies them under a single programming model. As if this weren t ambitious enough, it also promotes service orientation to a first-class citizen, while also supporting the best practice usage of conventional Distributed Object and Remote Procedure Call (RPC) technologies. WCF ships within WinFX a redistributable that contains the .NET Framework 2.0, Windows Communication Foundation, and Windows Presentation Foundation (Microsoft s next-generation UI technology). The WinFX release is planned for the second half of 2006 alongside Windows Vista. WinFX for Windows XP (SP2+) and Windows Server 2003 (SP1+) will also ship at the same time.
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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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Understanding the WCF Motivations
As with any new technology, having a good understanding of WCF begins with having an appreciation for its underlying motivations. After all, .NET currently has several effective technologies that enable you to build distributed applications: .NET Remoting, MSMQ, Enterprise Services, and, of course, Web Services. What is the point of having yet another distributed technology In this section, we tackle this all-important question.
Problem: Distributed Technology Soup
In the previous paragraph, we mentioned the many distributed technologies that are already available to .NET developers. To save syllables and trees, we ll collectively refer to these four technologies .NET Remoting, MSMQ, Enterprise Services, and Web Services as the Big Four. 1 Although it s usually nice to have many options, in this case, the number of options combined with large amounts of overlapping functionality make it extremely difficult to choose the right technology for the job. Of course, each of the Big Four exhibits distinct advantages and disadvantages relative to the others. But deciding the right technology based on them may require application and infrastructure knowledge that you may not yet have. For example, you may choose Web Services to leverage its loose coupling advantage, only to find out much later that the actual application load requires the performance advantage of Enterprise Services. Given that the programming models for each of the Big Four differ greatly, switching to another technology midstream in the development cycle proves difficult and costly. To better understand the nature of the problem, take a look at Table 9-1. This table details each technology s characteristics, advantages, and disadvantages. Looking at this, it s no wonder that news groups and forums are flush with which, when, where, and why questions regarding the Big Four.
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