/*
 * Copyright (c) 2006 University of Utah and the Flux Group.
 * 
 * {{{EMULAB-LICENSE
 * 
 * This file is part of the Emulab network testbed software.
 * 
 * This file is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * This file 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 Affero General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * }}}
 */

// MinDelaySensor.h

// This sensor keeps track of the lowest delay seen recently. The
// lowest value it has decays slowly as new measurements come in.

#ifndef MIN_DELAY_SENSOR_H_STUB_2
#define MIN_DELAY_SENSOR_H_STUB_2

#include "Sensor.h"
#include "Decayer.h"

class DelaySensor;

class MinDelaySensor : public Sensor
{
public:
  MinDelaySensor(DelaySensor const * newDelay);
  // Note: This is the minimum RTT, not one-way delay
  int getMinDelay(void) const;
protected:
  virtual void localSend(PacketInfo * packet);
  virtual void localAck(PacketInfo * packet);
private:
  Decayer minimum;
  DelaySensor const * delay;
  int minDelay;
  int lastreported;
};

#endif