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POCommunication pattern for child objects to parents
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copied!<p>I am actually developping a multithreaded game server in C#. I am trying to create it as unit-testable as possible.</p> <p>As of now, the pattern I started using resemble to something like this : </p> <p>A <strong>Server</strong> class is instanciated:</p> <ul> <li>Serves to start and shutdown the server </li> </ul> <p>OnStart the Server instanciate the <strong>ConnnectionManager</strong> : </p> <ul> <li>Contains an instance of the class <strong>ConnectionPool</strong> </li> <li>Serves to accept asynchronously connections (via TCPListener.BeginAcceptSocket) </li> <li>When a socket is accepted an instance of <strong>ClientConnection</strong> is created ans added to the list in <strong>ConnectionsPool</strong> </li> </ul> <p>The class <strong>ConnectionsPool</strong> : </p> <ul> <li>Responsible to add and remove active connections to the pool, managed as a list </li> </ul> <p>The class <strong>ClientConnection</strong> : </p> <ul> <li>Responsible to receive the data via Socket.BeginReceive </li> <li>When all is received, an instance of <strong>SocketHandler</strong> is created (basically parse the socket content and run actions)</li> </ul> <p>The schema should look like this :<br> Server -> ConnectionManager -> ConnectionsPool -> ClientConnection -> SocketHandler</p> <p><strong>The problem</strong> :<br> When I am inside the SocketHandler, how can I affect another player ? (for example, player A hits player B: I need to get the instance of the player B inside ConnectionsPool and update his HP property) or even update the server itself (say call the shutdown method on the Server class)</p> <p>I assume to have 3 choices : </p> <ul> <li>Transform all important classes (Server + ConnectionsPool) into static classes > drawback: can't be unit tested</li> <li>Transform all important classes into Singleton classes > drawback : difficult to test </li> <li>Inject inside child constructor the instances of important classes > drawback : less readable code since a lot of information is passed</li> </ul> <p>The goal here is to make this all unit testable using best practices while keeping a simple approach.</p> <p>I received a suggestion to inject a delegate to childs which is similar to the 3rd method, but I am unsure about unit testing this and the real effect since everything is multithreaded of course.</p> <p>What would be the best architecture choice here ?</p>

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