chromium/base/metrics/persistent_histogram_storage.h

// Copyright 2018 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_PERSISTENT_HISTOGRAM_STORAGE_H_
#define BASE_METRICS_PERSISTENT_HISTOGRAM_STORAGE_H_

#include <string_view>

#include "base/base_export.h"
#include "base/files/file_path.h"

namespace base {

// This class creates a fixed sized persistent memory to allow histograms to be
// stored in it. When a PersistentHistogramStorage is destructed, histograms
// recorded during its lifetime are persisted in the directory
// |storage_base_dir_|/|allocator_name| (see the ctor for allocator_name).
// Histograms are not persisted if the storage directory does not exist on
// destruction. PersistentHistogramStorage should be instantiated as early as
// possible in the process lifetime and should never be instantiated again.
// Persisted histograms will eventually be reported by Chrome.
class BASE_EXPORT PersistentHistogramStorage { … };

}  // namespace base

#endif  // BASE_METRICS_PERSISTENT_HISTOGRAM_STORAGE_H_