Program Listing for File time.h

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/*
 * Software License Agreement (BSD License)
 *
 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2010-2012, Willow Garage, Inc.
 *  Copyright (c) 2012-, Open Perception, Inc.
 *
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 *
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 *     notice, this list of conditions and the following disclaimer.
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 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
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#ifndef PCL_TIME_H_
#define PCL_TIME_H_

#ifdef __GNUC__
#pragma GCC system_header
#endif

#include <cmath>
#include <queue>
#include <string>
#ifndef Q_MOC_RUN
#include <boost/date_time/posix_time/posix_time.hpp>
#endif

/**
  * \file pcl/common/time.h
  * Define methods for measuring time spent in code blocks
  * \ingroup common
  */

/*@{*/
namespace pcl
{
  /** \brief Simple stopwatch.
    * \ingroup common
    */
  class StopWatch
  {
    public:
      /** \brief Constructor. */
      StopWatch () : start_time_ (boost::posix_time::microsec_clock::local_time ())
      {
      }

      /** \brief Destructor. */
      virtual ~StopWatch () {}

      /** \brief Retrieve the time in milliseconds spent since the last call to \a reset(). */
      inline double
      getTime ()
      {
        boost::posix_time::ptime end_time = boost::posix_time::microsec_clock::local_time ();
        return (static_cast<double> (((end_time - start_time_).total_milliseconds ())));
      }

      /** \brief Retrieve the time in seconds spent since the last call to \a reset(). */
      inline double
      getTimeSeconds ()
      {
        return (getTime () * 0.001f);
      }

      /** \brief Reset the stopwatch to 0. */
      inline void
      reset ()
      {
        start_time_ = boost::posix_time::microsec_clock::local_time ();
      }

    protected:
      boost::posix_time::ptime start_time_;
  };

  /** \brief Class to measure the time spent in a scope
    *
    * To use this class, e.g. to measure the time spent in a function,
    * just create an instance at the beginning of the function. Example:
    *
    * \code
    * {
    *   pcl::ScopeTime t1 ("calculation");
    *
    *   // ... perform calculation here
    * }
    * \endcode
    *
    * \ingroup common
    */
  class ScopeTime : public StopWatch
  {
    public:
      inline ScopeTime (const char* title) :
        title_ (std::string (title))
      {
        start_time_ = boost::posix_time::microsec_clock::local_time ();
      }

      inline ScopeTime () :
        title_ (std::string (""))
      {
        start_time_ = boost::posix_time::microsec_clock::local_time ();
      }

      inline ~ScopeTime ()
      {
        double val = this->getTime ();
        std::cerr << title_ << " took " << val << "ms.\n";
      }

    private:
      std::string title_;
  };

  /** \brief A helper class to measure frequency of a certain event.
    *
    * To use this class create an instance and call event() function every time
    * the event in question occurs. The estimated frequency can be retrieved
    * with getFrequency() function.
    *
    * \author Sergey Alexandrov
    * \ingroup common
    */
  class EventFrequency
  {

    public:

      /** \brief Constructor.
        *
        * \param[in] window_size number of most recent events that are
        * considered in frequency estimation (default: 30) */
      EventFrequency (size_t window_size = 30)
      : window_size_ (window_size)
      {
        stop_watch_.reset ();
      }

      /** \brief Notifies the class that the event occurred. */
      void event ()
      {
        event_time_queue_.push (stop_watch_.getTimeSeconds ());
        if (event_time_queue_.size () > window_size_)
          event_time_queue_.pop ();
      }

      /** \brief Retrieve the estimated frequency. */
      double
      getFrequency () const
      {
        if (event_time_queue_.size () < 2)
          return (0.0);
        return ((event_time_queue_.size () - 1) /
                (event_time_queue_.back () - event_time_queue_.front ()));
      }

      /** \brief Reset frequency computation. */
      void reset ()
      {
        stop_watch_.reset ();
        event_time_queue_ = std::queue<double> ();
      }

    private:

      pcl::StopWatch stop_watch_;
      std::queue<double> event_time_queue_;
      const size_t window_size_;

  };

#ifndef MEASURE_FUNCTION_TIME
#define MEASURE_FUNCTION_TIME \
  ScopeTime scopeTime(__func__)
#endif

inline double
getTime ()
{
  boost::posix_time::ptime epoch_time (boost::gregorian::date (1970, 1, 1));
  boost::posix_time::ptime current_time = boost::posix_time::microsec_clock::local_time ();
  return (static_cast<double>((current_time - epoch_time).total_nanoseconds ()) * 1.0e-9);
}

/// Executes code, only if secs are gone since last exec.
#ifndef DO_EVERY_TS
#define DO_EVERY_TS(secs, currentTime, code) \
if (1) {\
  static double s_lastDone_ = 0.0; \
  double s_now_ = (currentTime); \
  if (s_lastDone_ > s_now_) \
    s_lastDone_ = s_now_; \
  if ((s_now_ - s_lastDone_) > (secs)) {        \
    code; \
    s_lastDone_ = s_now_; \
  }\
} else \
  (void)0
#endif

/// Executes code, only if secs are gone since last exec.
#ifndef DO_EVERY
#define DO_EVERY(secs, code) \
  DO_EVERY_TS(secs, pcl::getTime(), code)
#endif

}  // end namespace
/*@}*/

#endif  //#ifndef PCL_NORMS_H_