macedon_udp_transport.h

这是一个著名的应用层组播中间件的源码

//Copyright (c) 2004, Charles Killian, Adolfo Rodriguez, Dejan Kostic, Sooraj Bhat, and Amin Vahdat
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in
//     the documentation and/or other materials provided with the
//     distribution.
//   * Neither the names of Duke University nor The University of
//     California, San Diego, nor the names of its contributors
//     may be used to endorse or promote products derived from
//     this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
//FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
//DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
//SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
//CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
//USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef __udp_transport
#define __udp_transport
#include <stdlib.h>
#include <stdio.h>

#include <sys/types.h>
#include <stropts.h>
#include <limits.h>
#include <poll.h>

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include "macedon_transport.h"
#include <pthread.h>
#include <list>
#include "macedon_connection.h"

#define CLEANUP_TIME 5.0
#define TRANSPORT_TIMEOUT 100.0
#define MACEDON_MAX_UDP_SIZE 8192

void *connecter (void *);

class macedon_udp_transport : public macedon_transport
{
public:
  static const int PORT = 0x1514;
  static const double MAX_QUEUE_SIZE = 1;
  
  macedon_udp_transport	( int ipaddr, int port = PORT, 
		  int queue_size = MAX_QUEUE_SIZE );
  ~macedon_udp_transport ( );
protected:
  struct sockaddr_in server_socket;  
  int server_descriptor;
  double time_last_cleanup;
  struct pollfd waiting_structure[1];
  void actual_work();
  void cleanup ();

  // virtual functions
  void wait_for_work ();
  void do_work ();
  void terminate (int code = 0);
  int send_more (macedon_connection *);
  int recv_more (macedon_connection *);
  virtual int transport_connect(macedon_connection *);
  virtual int transport_disconnect(macedon_connection *);
};
#endif //__macedon_udp_transport