Keep only base/extractor.[cc|h].

statsreport/aggregator.h

-// Copyright 2006-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-//
-// Helper class to aggregate the collected in-memory stats to persistent
-// storage.
-#ifndef OMAHA_STATSREPORT_AGGREGATOR_H__
-#define OMAHA_STATSREPORT_AGGREGATOR_H__
-
-#include "metrics.h"
-
-namespace stats_report {
-// TODO(omaha): Refactor to avoid cross platform code duplication.
-
-/// Wrapper class and interface for metrics aggregation. This is a platform
-/// independent class and needs to be subclassed for various platforms and/or
-/// metrics persistence methods
-class MetricsAggregator {
-public:
-  /// Aggregate all metrics in the associated collection
-  /// @returns true iff aggregation started successfully, false otherwise.
-  bool AggregateMetrics();
-
-protected:
-  MetricsAggregator();
-  MetricsAggregator(const MetricCollection &coll);
-  virtual ~MetricsAggregator();
-
-  /// Start aggregation. Override this to grab locks, open files, whatever
-  /// needs to happen or can expedite the individual aggregate steps.
-  /// @return true on success, false on failure.
-  /// @note aggregation will not progress if this function returns false
-  virtual bool StartAggregation();
-  virtual void EndAggregation();
-
-  virtual void Aggregate(CountMetric &metric) = 0;
-  virtual void Aggregate(TimingMetric &metric) = 0;
-  virtual void Aggregate(IntegerMetric &metric) = 0;
-  virtual void Aggregate(BoolMetric &metric) = 0;
-
-private:
-  DISALLOW_EVIL_CONSTRUCTORS(MetricsAggregator);
-
-  const MetricCollection &coll_;
-};
-
-} // namespace stats_report
-
-#endif  // OMAHA_STATSREPORT_AGGREGATOR_H__