developer.intra2net.com Git - libt2n/blob - src/command_server.hxx

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Gerd v. Egidy                                   *
   3  *   gve@intra2net.com                                                     *
   4  *                                                                         *
   5  *   This library is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU Lesser General Public License version   *
   7  *   2.1 as published by the Free Software Foundation.                     *
   8  *                                                                         *
   9  *   This library is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU Lesser General Public License for more details.                   *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU Lesser General Public      *
  15  *   License along with this program; if not, write to the                 *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19 #ifndef __LIBT2N_COMMAND_SERVER
  20 #define __LIBT2N_COMMAND_SERVER
  21
  22 #include "command.hxx"
  23 #include "server.hxx"
  24
  25 namespace libt2n
  26 {
  27
  28 /// a server handling incoming commands
  29 class command_server
  30 {
  31     private:
  32         server& s;
  33
  34         void handle_packet(const std::string& packet, server_connection* conn);
  35
  36     protected:
  37         virtual command* cast_command(command* input)
  38             { return input; }
  39
  40     public:
  41         command_server(server& _s);
  42
  43         void handle(long long usec_timeout=-1, long long* usec_timeout_remaining=NULL);
  44
  45         void send_hello(unsigned int conn_id);
  46
  47         std::ostream* get_logstream(log_level_values level)
  48             { return s.get_logstream(level); }
  49 };
  50
  51 template<class T, class B> struct Derived_from {
  52         static void constraints(T* p) { B* pb = p; }
  53         Derived_from() { void(*p)(T*) = constraints; }
  54 };
  55
  56 /** @brief server handling group of incoming commands
  57
  58     the template must be derived from libt2n::command.
  59 */
  60 template<class COMMAND_GROUP>
  61 class group_command_server : public command_server
  62 {
  63     private:
  64         virtual command* cast_command(command* input)
  65             { return dynamic_cast<COMMAND_GROUP*>(input); }
  66
  67     public:
  68         group_command_server(server& _s)
  69             : command_server(_s)
  70         { Derived_from<COMMAND_GROUP,command>(); }
  71 };
  72
  73 }
  74 #endif
  75