62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
|
// 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_SNAPSHOT_MANAGER_H_
|
||
|
|
#define BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_
|
||
|
|
|
||
|
|
#include <map>
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include "base/basictypes.h"
|
||
|
|
#include "base/metrics/histogram_base.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
class HistogramSamples;
|
||
|
|
class HistogramFlattener;
|
||
|
|
|
||
|
|
// HistogramSnapshotManager handles the logistics of gathering up available
|
||
|
|
// histograms for recording either to disk or for transmission (such as from
|
||
|
|
// renderer to browser, or from browser to UMA upload). Since histograms can sit
|
||
|
|
// in memory for an extended period of time, and are vulnerable to memory
|
||
|
|
// corruption, this class also validates as much rendundancy as it can before
|
||
|
|
// calling for the marginal change (a.k.a., delta) in a histogram to be
|
||
|
|
// recorded.
|
||
|
|
class BASE_EXPORT HistogramSnapshotManager {
|
||
|
|
public:
|
||
|
|
explicit HistogramSnapshotManager(HistogramFlattener* histogram_flattener);
|
||
|
|
virtual ~HistogramSnapshotManager();
|
||
|
|
|
||
|
|
// Snapshot all histograms, and ask |histogram_flattener_| to record the
|
||
|
|
// delta. The arguments allow selecting only a subset of histograms for
|
||
|
|
// recording, or to set a flag in each recorded histogram.
|
||
|
|
void PrepareDeltas(HistogramBase::Flags flags_to_set, bool record_only_uma);
|
||
|
|
|
||
|
|
private:
|
||
|
|
// Snapshot this histogram, and record the delta.
|
||
|
|
void PrepareDelta(const HistogramBase& histogram);
|
||
|
|
|
||
|
|
// Try to detect and fix count inconsistency of logged samples.
|
||
|
|
void InspectLoggedSamplesInconsistency(
|
||
|
|
const HistogramSamples& new_snapshot,
|
||
|
|
HistogramSamples* logged_samples);
|
||
|
|
|
||
|
|
// For histograms, track what we've already recorded (as a sample for
|
||
|
|
// each histogram) so that we can record only the delta with the next log.
|
||
|
|
std::map<std::string, HistogramSamples*> logged_samples_;
|
||
|
|
|
||
|
|
// List of histograms found to be corrupt, and their problems.
|
||
|
|
std::map<std::string, int> inconsistencies_;
|
||
|
|
|
||
|
|
// |histogram_flattener_| handles the logistics of recording the histogram
|
||
|
|
// deltas.
|
||
|
|
HistogramFlattener* histogram_flattener_; // Weak.
|
||
|
|
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(HistogramSnapshotManager);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_
|