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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2011 Bucknell University
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors: L. Felipe Perrone (perrone@bucknell.edu)
 *          Tiago G. Rodrigues (tgr002@bucknell.edu)
 *
 * Modified by: Mitch Watrous (watrous@u.washington.edu)
 */

#ifndef BOOL_PROBE_H
#define BOOL_PROBE_H

#include "ns3/probe.h"
#include "ns3/object.h"
#include "ns3/callback.h"
#include "ns3/boolean.h"
#include "ns3/traced-value.h"
#include "ns3/simulator.h"

namespace ns3 {

/**
 * \ingroup probes
 *
 * This class is designed to probe an underlying ns3 TraceSource exporting
 * a bool.  This probe exports a trace source "Output" of type bool.
 * The Output trace source emits a value when either the trace source
 * emits a new value, or when SetValue () is called.
 *
 * The current value of the probe can be polled with the GetValue ()
 * method.
 */
class BooleanProbe : public Probe
{
public:
  /**
   * \brief Get the type ID.
   * \return the object TypeId
   */
  static TypeId GetTypeId ();
  BooleanProbe ();
  virtual ~BooleanProbe ();

  /**
   * \return the most recent value
   */
  bool GetValue (void) const;

  /**
   * \param value set the traced bool to a new value
   */
  void SetValue (bool value);

  /**
   * \brief Set a probe value by its name in the Config system
   *
   * \param path Config path to access the probe
   * \param value set the traced bool to a new value
   */
  static void SetValueByPath (std::string path, bool value);

  /**
   * \brief connect to a trace source attribute provided by a given object
   *
   * \param traceSource the name of the attribute TraceSource to connect to
   * \param obj ns3::Object to connect to
   * \return true if the trace source was successfully connected
   */
  virtual bool ConnectByObject (std::string traceSource, Ptr<Object> obj);

  /**
   * \brief connect to a trace source provided by a config path
   *
   * \param path Config path to bind to
   *
   * Note, if an invalid path is provided, the probe will not be connected
   * to anything.
   */
  virtual void ConnectByPath (std::string path);

private:
  /**
   * \brief Method to connect to an underlying ns3::TraceSource of type bool
   *
   * \param oldData previous value of the bool
   * \param newData new value of the bool
   */
  void TraceSink (bool oldData, bool newData);

  TracedValue<bool> m_output; //!< Output trace source.
};

} // namespace ns3

#endif // BOOL_PROBE_H