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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_SNAPSHOT_MANAGER_H_
#define BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
#include "base/metrics/histogram_flattener.h"
namespace base {
// 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(base::Histogram::Flags flags_to_set, bool record_only_uma);
private:
// Maintain a map of histogram names to the sample stats we've recorded.
typedef std::map<std::string, base::Histogram::SampleSet> LoggedSampleMap;
// List of histograms names, and their encontered corruptions.
typedef std::map<std::string, int> ProblemMap;
// Snapshot this histogram, and record the delta.
void PrepareDelta(const base::Histogram& histogram);
// 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.
LoggedSampleMap logged_samples_;
// List of histograms found corrupt to be corrupt, and their problems.
scoped_ptr<ProblemMap> 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_
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