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As I said, the value of MVC lies in its two separations Of these the separation of presentation and model is one of the most important design principles in software, and the only time you shouldn't follow it is in very simple systems where the model has no real behavior in it anyway As soon as you get some nonvisual logic you should apply the separation Unfortunately, a lot of UI frameworks make it difficult, and those that don't are often taught without a separation
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The separation of view and controller is less important, so I'd only recommend doing it when it is really helpful For rich-client systems, that ends up being hardly ever, although it's common in Web front ends where the controller is separated out Most of the patterns on Web design here are based on that principle
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An object that handles a request for a specific page or action on a Web site
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Most people's basic Web experience is with static HTML pages When you request static HTML you pass to the Web server the name and path for a HTML document stored on it The key notion is that each page on the Web site is a separate document on the server With dynamic pages things can get much more interesting since there's a much more complex relationship between path names and the file that responds However, the approach of one path leading to one file that handles the request is a simple model to understand
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As a result, Page Controller has one input controller for each logical page of the Web site That controller may
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be the page itself, as it often is in server page environments, or it may be a separate object that corresponds to that page
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The basic idea behind a Page Controller is to have one module on the Web server act as the controller for each page on the Web site In practice, it doesn't work out to exactly one module per page, since you may hit a link sometimes and get a different page depending on dynamic information More strictly, the controllers tie in to each action, which may be clicking a link or a button
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The Page Controller can be structured either as a script (CGI script, servlet, etc) or as a server page (ASP, PHP, JSP, etc) Using a server page usually combines the Page Controller and a Template View (350) in the same file This works well for the Template View (350) but less well for the Page Controller because it's more awkward to properly structure the module If the page is a simple display, this isn't a problem However, if there's logic involved in either pulling data out of the request or deciding which actual view to display, then you can end up with awkward scriptlet code in the server page
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One way of dealing with scriptlet code is to use a helper object In this case the first thing the server page does is call the helper object to handle all the logic The helper may return control to the original server page, or it may forward to a different server page to act as the view, in which case the server page is the request handler but most of the controller logic lies in the helper
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Another approach is to make a script the handler and controller The Web server passes control to the script; the script carries out the controller's responsibilities and finally forwards to an appropriate view to display any results
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The basic responsibilities of a Page Controller are:
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Decode the URL and extract any form data to figure out all the data for the action Create and invoke any model objects to process the data All relevant data from the HTML request should be passed to the model so that the model objects don't need any connection to the HTML request Determine which view should display the result page and forward the model information to it
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The Page Controller needn't be a single class but can invoke helper objects This is particularly useful if several handlers have to do similar tasks A helper class can then be a good spot to put any code that would otherwise be duplicated
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There's no reason that you can't have some URLs handled by server pages and some by scripts Any URLs that have little or no controller logic are best handled with a server page, since that provides a simple mechanism that's easy to understand and modify Any URLs with more complicated logic go to a script I've come across teams who want to handle everything the same way: all server page or everything is a script Any advantages of consistency in such an application are usually offset by the problems of either scriptlet-laden server pages or lots of simple pass-through scripts
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