chromium/base/metrics/histogram_snapshot_manager.h

// Copyright 2012 The Chromium Authors
// 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 <stdint.h>

#include <atomic>
#include <map>
#include <memory>
#include <vector>

#include "base/base_export.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.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 redundancy as it can before
// calling for the marginal change (a.k.a., delta) in a histogram to be
// recorded.
class BASE_EXPORT HistogramSnapshotManager final { … };

}  // namespace base

#endif  // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_