52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_METRICS_HISTOGRAM_FLATTENER_H_
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#define BASE_METRICS_HISTOGRAM_FLATTENER_H_
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#include <map>
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#include <string>
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#include "base/basictypes.h"
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#include "base/metrics/histogram.h"
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namespace base {
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class HistogramSamples;
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// HistogramFlattener is an interface used by HistogramSnapshotManager, which
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// handles the logistics of gathering up available histograms for recording.
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// The implementors handle the exact lower level recording mechanism, or
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// error report mechanism.
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class BASE_EXPORT HistogramFlattener {
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public:
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virtual void RecordDelta(const HistogramBase& histogram,
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const HistogramSamples& snapshot) = 0;
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// Will be called each time a type of Inconsistency is seen on a histogram,
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// during inspections done internally in HistogramSnapshotManager class.
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virtual void InconsistencyDetected(HistogramBase::Inconsistency problem) = 0;
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// Will be called when a type of Inconsistency is seen for the first time on
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// a histogram.
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virtual void UniqueInconsistencyDetected(
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HistogramBase::Inconsistency problem) = 0;
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// Will be called when the total logged sample count of a histogram
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// differs from the sum of logged sample count in all the buckets. The
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// argument |amount| is the non-zero discrepancy.
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virtual void InconsistencyDetectedInLoggedCount(int amount) = 0;
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protected:
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HistogramFlattener() {}
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virtual ~HistogramFlattener() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(HistogramFlattener);
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};
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} // namespace base
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#endif // BASE_METRICS_HISTOGRAM_FLATTENER_H_
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