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Many systems receive, route, and handle requests A conditional dispatcher is a conditional statement (such as a switch) that performs request routing and handling Some conditional dispatchers are well suited for their jobs; others aren't Conditional dispatchers that are well suited for their jobs tend to route a small number of requests to small chunks of handler logic Such dispatchers can often be viewed on a monitor without having to scroll to see all of the code The Command pattern usually doesn't provide a useful replacement for these kinds of conditional dispatchers On the other hand, if your conditional dispatcher is small, it may still not be a good fit for your system The two most common reasons to refactor from a conditional dispatcher to a Command-based solution are the following 1 Not enough runtime flexibility: Clients that rely on the conditional dispatcher develop a need to dynamically configure it with new requests or handler logic Yet the conditional dispatcher doesn't allow for such dynamic configurations because all of its routing and handling logic is hard-coded into a single conditional statement A bloated body of code: Some conditional dispatchers become enormous and unwieldy as they evolve to handle new requests or as their handler logic becomes ever more complex with new responsibilities Extracting the handler logic into different methods doesn't help enough because the class that contains the dispatcher and extracted handler methods is still too large to work with crystal reports barcode generator free Crystal Reports viewer(runtime) barcode printing problem . ... 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The Command pattern provides an excellent solution to such problems To implement it, you simply place each piece of request-handling logic in a separate "command" class that has a common method, like execute() or run(), for executing its encapsulated handler logic Once you have a family of such commands, you can use a collection to store and retrieve instances of them; add, remove, or change instances; and execute instances by invoking their execution methods Routing requests and executing diverse behavior in a uniform way may be so central to a design that you may find yourself using the Command pattern early, rather than refactoring to it later Many of the server-side, Web-based systems I've built have used the Command pattern to produce a standard way to route requests, execute actions, or forward actions to other actions The Example section shows how to refactor to such a solution The authors of Design Patterns [DP] explain how the Command pattern is often used to support an undo/redo capability A question that often arises in extreme programming (XP) circles is what to do when you aren't sure whether a system will need undo/redo Do you just implement the Command pattern in case the need arises Or is that a violation of "You aren't gonna need it," an XP principle that cautions against adding functionality to code based on speculation, not genuine need If I'm not sure whether a system needs the Command pattern, I generally don't implement it, for I find that it isn't that hard to refactor to this pattern when the need arises However, if your code is getting into a state in which it will be harder and harder to refactor to the Command pattern and there's a good chance you'll soon need an undo/redo capability, it may make sense to refactor it to use Command before doing so will be impossibly hard It's a bit like taking out an insurance plan The Command pattern is easy to implement, versatile, and incredibly useful This refactoring captures only one area in which it is useful Because Command can solve other tricky problems, there could easily be additional refactorings to it. free barcode font for crystal report How to Generate Barcodes in Crystal Report - OnBarcode Generate , Create, Print, & Draw Linear, 2D Bar Codes in Crystal Reports for .NET. generating labels with barcode in c# using crystal reports Barcode Generator for Crystal Reports Free Download Aug 7, 2009 · Barcode Generator for Crystal Reports - Create barcodes in Crystal Reports without installing additional fonts or other components with the ... 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