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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_METRICS_HISTOGRAM_FLATTENER_H_
#define BASE_METRICS_HISTOGRAM_FLATTENER_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
namespace base {
// HistogramFlattener is an interface for the logistics of gathering up
// available histograms for recording. The implementors handle the exact lower
// level recording mechanism, or error report mechanism.
class BASE_EXPORT HistogramFlattener {
public:
virtual void RecordDelta(const base::Histogram& histogram,
const base::Histogram::SampleSet& snapshot) = 0;
// Record various errors found during attempts to record histograms.
virtual void InconsistencyDetected(int problem) = 0;
virtual void UniqueInconsistencyDetected(int problem) = 0;
virtual void SnapshotProblemResolved(int amount) = 0;
protected:
HistogramFlattener() {}
virtual ~HistogramFlattener() {}
private:
DISALLOW_COPY_AND_ASSIGN(HistogramFlattener);
};
} // namespace base
#endif // BASE_METRICS_HISTOGRAM_FLATTENER_H_
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