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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/macros.h"
#include "base/metrics/histogram.h"
namespace base {
class HistogramSamples;
// HistogramFlattener is an interface used by HistogramSnapshotManager, which
// handles 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 HistogramBase& histogram,
const HistogramSamples& snapshot) = 0;
// Will be called each time a type of Inconsistency is seen on a histogram,
// during inspections done internally in HistogramSnapshotManager class.
virtual void InconsistencyDetected(HistogramBase::Inconsistency problem) = 0;
// Will be called when a type of Inconsistency is seen for the first time on
// a histogram.
virtual void UniqueInconsistencyDetected(
HistogramBase::Inconsistency problem) = 0;
// Will be called when the total logged sample count of a histogram
// differs from the sum of logged sample count in all the buckets. The
// argument |amount| is the non-zero discrepancy.
virtual void InconsistencyDetectedInLoggedCount(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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