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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/macros.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 sorted in nondecreasing order array of histogram hashes, its size and
// list of whitelisted histogram names concatenated as a comma-separated
// string.
ExpiredHistogramsChecker(const uint64_t* array,
size_t size,
const std::string& whitelist_str);
~ExpiredHistogramsChecker() override;
// Checks if the given |histogram_hash| corresponds to an expired histogram.
bool ShouldRecord(uint64_t histogram_hash) const override;
private:
// Initializes the |whitelist_| array of histogram hashes that should be
// recorded regardless of their expiration.
void InitWhitelist(const std::string& whitelist_str);
// Array of expired histogram hashes.
const uint64_t* const array_;
// Size of the |array_|.
const size_t size_;
// List of expired histogram hashes that should be recorded.
std::set<uint64_t> whitelist_;
DISALLOW_COPY_AND_ASSIGN(ExpiredHistogramsChecker);
};
} // namespace metrics
#endif // COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
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