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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_REPORTING_METRICS_DELAYED_SAMPLER_H_
#define COMPONENTS_REPORTING_METRICS_DELAYED_SAMPLER_H_
#include <memory>
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "components/reporting/metrics/sampler.h"
namespace reporting {
// A `Sampler` subclass that takes ownership of an existing `Sampler` and
// delays the collection of that sampler by `delay` amount
// of time.
class DelayedSampler : public Sampler {
public:
DelayedSampler(std::unique_ptr<Sampler> sampler, base::TimeDelta delay);
DelayedSampler(const DelayedSampler&) = delete;
DelayedSampler& operator=(const DelayedSampler&) = delete;
~DelayedSampler() override;
// Waits until `delay_` amount of time has passed before collecting.
void MaybeCollect(OptionalMetricCallback callback) override;
private:
// Used inside `MaybeCollect`. Collects data from `sampler_`
void CollectInternal(OptionalMetricCallback callback);
// The `Sampler` we actually collect data from
std::unique_ptr<Sampler> sampler_;
// Amount of time to delay collection by
base::TimeDelta delay_;
base::WeakPtrFactory<DelayedSampler> weak_ptr_factory_{this};
};
} // namespace reporting
#endif // COMPONENTS_REPORTING_METRICS_DELAYED_SAMPLER_H_
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