bandwidth_time_filter.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
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#ifndef __bandwidth_time_filter
#define __bandwidth_time_filter
#include "generic_filter.h"
#include <list>
#include <pthread.h>

using namespace std;

class  bandwidth_triplet
{
public:
  bandwidth_triplet(double start1, double stop1, int size1): size(size1), start(start1), stop(stop1) {}
  int  size;
  double start, stop;
};
 

class bandwidth_time_filter:public generic_filter 
{
  
 public:
  static const int HISTORY_VALUE=4000;
  static const double BANDWIDTH_WINDOW=2.5;

  bandwidth_time_filter();
  ~bandwidth_time_filter();
  void start_update ();
  void update(int size1);
  void finish_update();
  void cancel_entry();
  void  clear ();
  double get_value();
  
 public:
 protected:
  void check ();
  list < bandwidth_triplet > history; 
};
#endif //__bandwidth_time_filter