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POQuestions about Blob anti-pattern in C++
 

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  1. POQuestions about Blob anti-pattern in C++
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    <p>I am developing a video player for our department using C++.</p> <p>This video player has three core modules: Reader(for reading data packets), Processor(decode the raw data), Display Handle(draw data on the screen). They are not close-coupled classes, which means they perform their jobs sort of independently. </p> <p>However, I have a GUI module that interfaces these three modules and the client. It will retrieve the commands from user, such as pause, continue, jump to a particular location in the video clip. This GUI module will then delegate the jobs to the three modules mentioned above. As a result, this GUI module grows fairly big as it contains many functions that the client will interact with. Though again, I am really careful that I don't let this GUI module do any real processing tasks(they are done on the three core modules), I am afraid this GUI module becomes a God Object or "Blob" which is an anti-pattern in Object-oriented design.</p> <p>This is the sample declaration for the GUI module here:</p> <pre><code>class CorePlayer { public: CorePlayer(); ~CorePlayer(); public: void start(); void pause(); void continue(); void jumpToFrame(int frameNum); void toggleFullScreen(); ......... private: Reader* rModule_; Processor* pModule_; DisplayHandle* dspHandle_; } </code></pre> <p>There are a lot more functions in the ........ area. They are functions people need for the media player. They don't perform the real processing, they delegate jobs to the modules. </p> <p>Can anybody help to clarify my concerns that this GUI module is a "Blob" using the design described?</p>
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    1. COA large class is not necessarily indicative of using a Blob anti-pattern. Sometimes you need a class with a lot of functionality. Without seeing your code or a more detailed description of your architecture, it's hard to say, though. When you say "GUI module" have you separated it into at least a view and controller?
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    2. CO@user1118321 I have added some sample code.It is more like a management class that manages the interface between clients and processing modules.
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    3. COlooks OK to me - I would however use smart pointer instead of naked Reader*
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