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Figure 4-2. Allocating memory for the reference of a class variable
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Although such an application might run on a single machine, it s more likely that the application will run on a web server, or be split between a smart client and an application server. Given these varied physical environments, we 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-to-relational mapping handled when retrieving or storing data in the database How are database transactions managed Before getting into discussing some answers to these questions, it s important to fully understand the difference between a physical architecture and a logical architecture. After that, I ll define objects and mobile objects, and see 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 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-tier (or n-layer) architecture. The latter 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 a UI layer, a business layer, and a data layer that may exist on a single machine, or on three separate machines the logical architecture doesn t define those details. Generic delegates are very much like nongeneric delegates, except that the type parameters determine the characteristics of what methods will be accepted. To declare a generic delegate, place the type parameter list in angle brackets after the delegate name and before the delegate parameter list.
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