Server.cs :  » Business-Application » DC » DCSharp » Backend » Connections » C# / CSharp Open Source

/* 
 * Copyright (C) 2004-2005 Jonathan Bindel
 * Copyright (C) 2006 Eskil Bylund
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

using System;
using System.Diagnostics;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace DCSharp.Backend.Connections{
  public abstract class Server
  {
    private readonly object syncRoot;

    #region Constructors

    protected Server(IPAddress localIP, int port)
    {
      Debug.Assert(port > 0);
      Debug.Assert(localIP != null);

      if(port > IPEndPoint.MaxPort)
      {
        throw new ArgumentOutOfRangeException("Port");
      }

      syncRoot = new object();

      this.localIP = localIP;
      this.port = port;
    }

    #endregion

    #region Properties

    private IPAddress localIP;

    public IPAddress LocalIP
    {
      get
      {
        return localIP;
      }
    }

    private int port;

    public int Port
    {
      get
      {
        return port;
      }
    }

    private Socket listener;

    public Socket Listener
    {
      get
      {
        return listener;
      }
      protected set
      {
        listener = value;
      }
    }

    private bool started = false;

    public bool IsStarted
    {
      get
      {
        return started;
      }
    }

    #endregion

    #region Methods

    public virtual void Start()
    {
      lock(syncRoot)
      {
        if(!started)
        {
          started = true;
          ServerStart();
        }
      }
    }

    public virtual void Stop()
    {
      lock(syncRoot)
      {
        if(!started)
        {
          return;
        }
        started = false;

        if(listener != null)
        {
          if (listener.Connected)
          {
            listener.Shutdown(SocketShutdown.Both);
          }
          listener.Close();
        }
      }
    }

    protected abstract void ServerStart();

    #endregion
  }
}