By Adam Kolawa
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Extra info for Bulletproofing Web Applications
By providing certain menu items on certain pages, you restrict the way users can move through the application and ensure that they will take a logical path. Client/server applications act as finite state machines that have a limited number of states and always know what state the user is in. Figure 3-4: Possible flow through a client/server application. As Figure 3-5 illustrates, paths are not nearly as well defined on the Web because the nature of Web development allows for a virtually infinite number of possible paths through the application.
In principle, storing information in state variables breaks the object-oriented paradigm. A fundamental principle of OOP is that all necessary information is encapsulated inside objects. Objects have to carry state information throughout the application, and as the information is modified, the object is “morphed” accordingly. In Web 37 development, though, objects don’t carry from one page to the next. A page is created and represented by objects, but the objects die as the page disappears. The most important information from the objects can be stored in state variables and re-created.
Regardless of how or when a page is accessed, you always get the same results. Static sites are composed solely of simple elements: HTML files, images, and the like. Static sites are relatively easy to test and maintain because the number of things that can go wrong is small. They are also easy to make scalable because you can use caching or multiple servers. A dynamic site typically contains nonchanging HTML and images like those found on static sites. However, it also contains elements that change, depending on circumstances such as time, user, database contents, and so on.