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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_MEMORY_SWAP_METRICS_DRIVER_IMPL_H_
#define CONTENT_BROWSER_MEMORY_SWAP_METRICS_DRIVER_IMPL_H_
#include <memory>
#include "base/gtest_prod_util.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/common/content_export.h"
#include "content/public/browser/swap_metrics_driver.h"
namespace content {
// SwapMetricsDriverImpl is the platform independent portion of the
// SwapMetricsDriver implementation.
class CONTENT_EXPORT SwapMetricsDriverImpl : public SwapMetricsDriver {
public:
SwapMetricsDriverImpl(const SwapMetricsDriverImpl&) = delete;
SwapMetricsDriverImpl& operator=(const SwapMetricsDriverImpl&) = delete;
~SwapMetricsDriverImpl() override;
// SwapMetricsDriver
SwapMetricsDriver::SwapMetricsUpdateResult InitializeMetrics() override;
bool IsRunning() override;
SwapMetricsDriver::SwapMetricsUpdateResult Start() override;
void Stop() override;
SwapMetricsDriver::SwapMetricsUpdateResult UpdateMetrics() override;
protected:
SwapMetricsDriverImpl(std::unique_ptr<Delegate> delegate,
const base::TimeDelta update_interval);
// Periodically called to update swap metrics.
void PeriodicUpdateMetrics();
// Common swap metrics update method for both periodic and manual updates.
SwapMetricsDriver::SwapMetricsUpdateResult UpdateMetricsImpl();
// Platform-dependent parts of UpdateMetricsImpl(). |interval| is the elapsed
// time since the last UpdateMetricsImpl() call. |interval| will be zero when
// this function is called for the first time.
virtual SwapMetricsDriver::SwapMetricsUpdateResult UpdateMetricsInternal(
base::TimeDelta interval) = 0;
// The Delegate observing the metrics updates.
std::unique_ptr<Delegate> delegate_;
private:
FRIEND_TEST_ALL_PREFIXES(TestSwapMetricsDriver, ExpectedMetricCounts);
FRIEND_TEST_ALL_PREFIXES(TestSwapMetricsDriver, UpdateMetricsFail);
// The interval between metrics updates.
base::TimeDelta update_interval_;
// A periodic timer to update swap metrics.
base::RepeatingTimer timer_;
// Holds the last TimeTicks when swap metrics are updated.
base::TimeTicks last_ticks_;
// True if and only if InitalizeMetrics() was called, and used to enforce
// InitializeMetrics() is called before UpdateMetrics(). This helps
// code readability.
bool is_initialized_;
// Updating metrics is not thread safe, and this checks that
// UpdateMetricsImpl() is always called on the same sequence.
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace content
#endif // CONTENT_BROWSER_MEMORY_SWAP_METRICS_DRIVER_IMPL_H_
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