internal/ceres/execution_summary.h

// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2015 Google Inc. All rights reserved.
// http://ceres-solver.org/
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// Author: sameeragarwal@google.com (Sameer Agarwal)

#ifndef CERES_INTERNAL_EXECUTION_SUMMARY_H_
#define CERES_INTERNAL_EXECUTION_SUMMARY_H_

#include <map>
#include <string>

#include "ceres/internal/port.h"
#include "ceres/wall_time.h"
#include "ceres/mutex.h"

namespace ceres {
namespace internal {

// Struct used by various objects to report statistics and other
// information about their execution. e.g., ExecutionSummary::times
// can be used for reporting times associated with various activities.
class ExecutionSummary {
 public:
  void IncrementTimeBy(const std::string& name, const double value) {
    CeresMutexLock l(&times_mutex_);
    times_[name] += value;
  }

  void IncrementCall(const std::string& name) {
    CeresMutexLock l(&calls_mutex_);
    calls_[name] += 1;
  }

  const std::map<std::string, double>& times() const { return times_; }
  const std::map<std::string, int>& calls() const { return calls_; }

 private:
  Mutex times_mutex_;
  std::map<std::string, double> times_;

  Mutex calls_mutex_;
  std::map<std::string, int> calls_;
};

class ScopedExecutionTimer {
 public:
  ScopedExecutionTimer(const std::string& name, ExecutionSummary* summary)
      : start_time_(WallTimeInSeconds()),
        name_(name),
        summary_(summary) {}

  ~ScopedExecutionTimer() {
    summary_->IncrementTimeBy(name_, WallTimeInSeconds() - start_time_);
  }

 private:
  const double start_time_;
  const std::string name_;
  ExecutionSummary* summary_;
};

}  // namespace internal
}  // namespace ceres

#endif  // CERES_INTERNAL_EXECUTION_SUMMARY_H_