Jetty web server - 160 CHAPTER 6 DECOUPLED NAVIGATION PATTERN is
160 CHAPTER 6 DECOUPLED NAVIGATION PATTERN is usually executed, some data is manipulated, and that data is converted into a user interface representation. The Decoupled Navigation pattern can be confused with the Persistent Communications pattern. The confusion stems from the fact that a timer event is an HTML event, and that the timer event could be used to kick off the Decoupled Navigation. The main difference between the Decoupled Navigation and Persistent Communications patterns is that Persistent Communications is used for ticker tape type applications. This means content is being generated in larger quantities, and it is more important to get information flowing from server to client, and not the usual client to server. Architecture The Decoupled Navigation pattern is an attempt to organize the possible navigations on an HTML page. The average HTML page has at least 30 links, and more than 50 is not out of the norm. If an HTML page has 30 links, those links need to be managed by using a strategy. And if 15 of those 30 links require some amount of JavaScript, the average HTML page will be very complex. Complexity requires organization because otherwise chaos and maintenance problems can result. The Decoupled Navigation pattern is used to provide organization to the chaos. Technically, classical navigation is the result of clicking a link that results in some content being downloaded. The process of navigation can be disassembled into three functionalities, as illustrated in Figure 6-6. E B V N Figure 6-6. Navigation disassembled into three functionalities
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