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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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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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// Posix aggregator, which aggregates counters to a keyvaluetable. It is the
// interface to the keyvaluetable for all clients.

#ifndef O3D_STATSREPORT_AGGREGATOR_POSIX_H__
#define O3D_STATSREPORT_AGGREGATOR_POSIX_H__

#include <string>
#include "aggregator.h"
#include "base/scoped_ptr.h"
#include "backend/keyvaluetable.h"

namespace stats_report {

class Formatter;

class MetricsAggregatorPosix: public MetricsAggregator {
 public:
  // @param coll the metrics collection to aggregate, most usually this
  //           is g_global_metrics.
  explicit MetricsAggregatorPosix(const MetricCollection &coll);
  ~MetricsAggregatorPosix();

  template <typename ValueType>
  bool GetValue(const string &key, ValueType *value);
  template <typename ValueType>
  bool SetValue(const string &key, ValueType value);

  void ResetMetrics();
  void FormatMetrics(Formatter *formatter);

 protected:
  virtual bool StartAggregation();
  virtual void EndAggregation();

  virtual void Aggregate(CountMetric *metric);
  virtual void Aggregate(TimingMetric *metric);
  virtual void Aggregate(IntegerMetric *metric);
  virtual void Aggregate(BoolMetric *metric);

 private:
  // The keyvaluetable
  scoped_ptr<KeyValueTable> key_value_table_;

  // The current transaction
  scoped_ptr<KeyValueTransaction> transaction_;

  DISALLOW_COPY_AND_ASSIGN(MetricsAggregatorPosix);
};

}  // namespace stats_report

#endif  // O3D_STATSREPORT_AGGREGATOR_POSIX_H__