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GenServer.javaAPI DocExample3004Sun Feb 01 14:19:08 GMT 1998None

GenServer

public class GenServer extends Thread

Fields Summary
protected int
portNo
protected ServerSocket
clientConnect
protected ClientConnection
connExemplar
Constructors Summary
public GenServer(int port)

    if (port <= 0)
      throw new IllegalArgumentException(
                  "Bad port number given to GenServer constructor.");

    // Try making a ServerSocket to the given port
    try { clientConnect = new ServerSocket(port); }
    catch (IOException e)
    {
      System.out.println("Failed to connect to port " + port);
      System.exit(1);
    }

    // Made the connection, so set the local port number
    this.portNo = port;
    this.connExemplar = new DummyClientConnection();
Methods Summary
public static voidmain(java.lang.String[] argv)

    int port;
    Class connectClass;
    ClientConnection clientType;
    ClassLoader loader = System.getClassLoader();

    // Get the requested port number off of the command line, if present
    if (args.length >= 1)
      port = Integer.parseInt(argv[0]);
    else
      port = 0;

    // Get the client connection class from the command line, if present
    if (args.length >= 2)
    {
      connectClass = loader.loadClass(argv[1]);
      try
      {
        clientType = (ClientConnection)connectClass.newInstance();
      }
      catch (ClassCastException e)
      {
        System.out.println("Given class name " + argv[1]
                           + " not a ClientConnection subclass.  Using default.");
        clientType = new DummyClientConnection();
      }
    }
    else
      clientType = new DummyClientConnection();

    // Connect a server to the port, and set the client type.
    GenServer gs = new GenServer(port);
    gs.setConnectionType(clientType);
    gs.run();
public voidrun()

    // Listen to port for client connection requests.  For each one,
    // attach a ClientConnection generated from our exemplar.
    try
    {
      while (true)
      {
        Socket clientReq = clientConnect.accept();
        ClientConnection c = conExemplar.newConnection();
        c.Connect(clientReq);
      }
    }
    catch (IOException e)
    {
      System.out.println("IO exception while listening for clients.");
      System.exit(1);
    }
public voidsetConnectionType(ClientConnection c)

    this.connExemplar = c;