udp.h

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/*  Glass - a distributed computing library
    Copyright (C) 2003-2009 Bruno Barberi Gnecco
    Copyright (C) 2009-2010 Corollarium Technologies


    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _GLASS_PROTOCOL_UDP_HH_
#define _GLASS_PROTOCOL_UDP_HH_

#include <map>

#if !defined(_MSC_VER)
#  include <netinet/in.h>
#endif

namespace libglass {

class LIBGLASS_API UDP : public Protocol {
private:
//      int readPacket(Packet &p, nodeFD sock);

        unsigned int writePacket(nodeFD fd, unsigned char *m, 
                        unsigned int length, struct sockaddr_in *addr);
 
protected:
#if defined(_MSC_VER) && (_MSC_VER < 1300)  // earlier than .NET compiler (VC 7.0)
        // Microsoft Knowledge Base Article - 241569 
        // Workaround for BUG: C2258 and C2252 on in Place Initialization of Static Const Members
        enum{ default_connect_port = 9192 };
        enum{ default_comm_port = 9193 };
#else
        static const unsigned int       default_connect_port = 9192;
        static const unsigned int       default_comm_port = 9193;
#endif

        unsigned int                    comm_port;

        struct server_struct { // Structure requires a name for std::map constructor to be generated under MSVC (see MSVC compiler error C2639)
                int             sockfd;         
                std::map<nodeFD, struct nodedata *>
                                clients;
        } server;
        struct client_struct { // Structure requires a name for std::map constructor to be generated under MSVC (see MSVC compiler error C2639)
                int             sockfd;         
                struct sockaddr_in 
                                address;        
        } client;

        PacketLog                       *plog;

        int _listen(unsigned int port);
        nodeFD _accept(void);
        nodeFD _connect(const char *host, unsigned int port);
        void _disconnect(nodeFD node);
        bool _send(Packet &p);
        int _recv(Packet &p);
public:
        UDP();
        ~UDP();
//      bool setPort(unsigned int comm_port);
};


}// namespace

#endif // _GLASS_PROTOCOL_UDP_HH_

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