Christian web host - 116 CHAPTER 5 PERMUTATIONS PATTERN The main
116 CHAPTER 5 PERMUTATIONS PATTERN The main idea behind the Permutations pattern is to present the right content at the right time. It is about creating content and presenting it appropriately based on the requirements of the end browsing device. By using the Permutations pattern, content is created like that of Google and Yahoo! From an end user perspective, that means users will need to remember only a single URL such as http://mydomain.com/bank/account/cgross, and then be assured regard less of device that they will be presented with similar content. Applicability The Permutations pattern is a core pattern that can and should be used as much as possible. However, it is a pattern that requires extra work, and that extra work should not be underestimated. For example, both Yahoo! and Google provide a similar, but different, user interface for their mobile clients. When implementing multiple user interfaces, a significant amount of work is associated with creating each one of them. Also understand that the Permutations pattern is not only user-interface related, but should be considered device related. With respect to current URLs used by current web application frameworks, the Permutations pattern may require redefinition. This means this pattern will revisit topics that seem already solved, such as session identification and authorization. The following contexts define when the Permutations pattern should be used: For the main entry points of a web application (such as http://mydomain.com/ application) or for a specific user (for example, http://mydomain.com/account/user). The idea is that if the end device and/or user has been identified, you don t have to keep re-identifying what or whom the device is. For web applications that are more Internet than intranet in nature. Controlling the end devices accessing an intranet web application is easy. In contrast, it is not possible to control the end devices accessing an Internet web application, nor should any attempt be made to control them. Associated Patterns The Permutations pattern is the basis of all patterns defined in this book. The Content Chunking and Persistent Communications patterns use the Permutations pattern directly, and the remaining patterns use it indirectly. The only pattern that does not explicitly use this pattern is Cache Controller. Architecture The big-picture architecture idea behind the Permutations pattern is to separate the resource from the representation. This means that when a URL is referenced, the data that is returned from the URL is not bound to the resource. This section explains the details of why you should separate the resource from the representation and how to do that.
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