bandwidth_filter.h

来自「这是一个著名的应用层组播中间件的源码」· C头文件 代码 · 共 71 行

//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_filter
#define __bandwidth_filter
#include "generic_filter.h"
#include <list>
#include <pthread.h>

using namespace std;

class  bandwidth_pair
{
public:
  bandwidth_pair(int  size1,  double  when1):  size (size1),  when (when1) {}
  int  size;
   double  when;
};
 

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

  bandwidth_filter	();
  ~bandwidth_filter	( );
  void  update (int size );
  void remove_entry(int);
  void  clear ();
  double get_value();
  
 public:
 protected:
  int  lock ();
  void  unlock ();
  void check ();
  list < bandwidth_pair > history; 
  int history_count;
 private:
  double time_initial;
};
#endif //__bandwidth_filter