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- // Copyright 2017 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 COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
- #define COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
- #include <stdint.h>
- #include <set>
- #include "base/memory/raw_ptr.h"
- #include "base/metrics/record_histogram_checker.h"
- #include "base/strings/string_piece.h"
- namespace metrics {
- // ExpiredHistogramsChecker implements RecordHistogramChecker interface
- // to avoid recording expired metrics.
- class ExpiredHistogramsChecker final : public base::RecordHistogramChecker {
- public:
- // Takes a sorted array of histogram hashes in ascending order, its size and a
- // list of explicitly allowed histogram names as a comma-separated string.
- // Histograms in the |allowlist_str| are logged even if their hash is in the
- // |expired_histograms_hashes|.
- ExpiredHistogramsChecker(const uint32_t* expired_histogram_hashes,
- size_t size,
- const std::string& allowlist_str);
- ExpiredHistogramsChecker(const ExpiredHistogramsChecker&) = delete;
- ExpiredHistogramsChecker& operator=(const ExpiredHistogramsChecker&) = delete;
- ~ExpiredHistogramsChecker() override;
- // Checks if the given |histogram_hash| corresponds to an expired histogram.
- bool ShouldRecord(uint32_t histogram_hash) const override;
- private:
- // Initializes the |allowlist_| array of histogram hashes that should be
- // recorded regardless of their expiration.
- void InitAllowlist(const std::string& allowlist_str);
- // Array of expired histogram hashes.
- const raw_ptr<const uint32_t> expired_histogram_hashes_;
- // Size of the |expired_histogram_hashes_|.
- const size_t size_;
- // Set of expired histogram hashes that should be recorded.
- std::set<uint32_t> allowlist_;
- };
- } // namespace metrics
- #endif // COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
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