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    <p>I gave a <a href="https://stackoverflow.com/questions/7016212/communication-pattern-for-child-objects-to-parents/7017344#7017344">related answer</a> not long ago. The subject was on improving the testability of code, for which the general solution is to loosen coupling. The main focus on that previous answer was on decoupling networking related code from the world and it's logic, because networking code is not unit testable and is a pain to mock too.</p> <p>The solution given there was to use an interface for incoming messages, such that you decouple the MessageProcessor (named Handler in other post) from the network code, and similarly, decouple the UpdateNotifier from the World.</p> <p><img src="https://i.stack.imgur.com/YhGvl.png" alt="enter image description here"></p> <p>The dashed line is just an indirect reference handled either by an interface or delegate. There exists no direct relation between the World and networking component now, making it testable. This is really just an application of the <a href="http://en.wikipedia.org/wiki/Model-view-adapter" rel="nofollow noreferrer">Model View Adapter</a> pattern.</p> <p><img src="https://i.stack.imgur.com/wxI9x.png" alt="M-V-A"></p> <p>This doesn't seem dissimilar to the design you've described having, except perhaps you are missing a few interfaces. With this pattern of interface based UpdateNotifiers used to push updates, I essentially reuse the same architecture for handling NPCs, tasks, or anything else which is processed elsewhere. You cherry pick the event notifiers you need for a particular area, and implement a concrete Notifier class for them, such that you have multiple adapters on the same model.</p> <p><img src="https://i.stack.imgur.com/f3RHC.png" alt="enter image description here"></p> <p>And that really only looks more complicated than it is. The World object has no direct dependencies on anything else, and each other class has at most one direct dependency. You can also isolate the timer from the World, as it probably isn't needed there - but perhaps one of the biggest hurdles is handling synchronization between the different adapters.</p>
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    1. POHow can I layout a decoupled class structure for a simple game?
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    1. CO+1 for a simple model, nicely-presented. and +♡ for diagrams without overly-specified UML! :) boxes, lines, and text, that's all you need. ("why do I have to write the program *before* I write the program?) *this.mySoapboxes.ComeDown(sb => sb.Title=="UML considered* <strike>harmful</strike> *overkill");*
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    2. COOnly reason I used any UML at all was because it's easier to draw than with MSPaint :p
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    3. COlol :) nah that isn't UML, that's just boxes and text and lines. [this is UML](http://upload.wikimedia.org/wikipedia/commons/8/81/UML_Diagrams.jpg) lol
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