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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 CHROME_BROWSER_ASH_ARC_VMM_ARC_VMM_SWAP_SCHEDULER_H_
#define CHROME_BROWSER_ASH_ARC_VMM_ARC_VMM_SWAP_SCHEDULER_H_
#include <optional>
#include "base/functional/callback.h"
#include "base/scoped_observation.h"
#include "base/timer/timer.h"
#include "chrome/browser/ash/arc/vmm/arc_system_state_observation.h"
#include "chromeos/ash/components/dbus/concierge/concierge_client.h"
namespace arc {
class PeaceDurationProvider;
// ArcVmmSwapScheduler periodically tries to swap out if it's suitable to enable
// VMM swap for ARCVM. It won't request to swap out within the given interval
// from the last swap out operation.
class ArcVmmSwapScheduler : public ash::ConciergeClient::VmObserver {
public:
// ArcVmmSwapScheduler is allowed receive calls to set swap state and
// control the swap state by itself.
// If the `minimum_swapout_interval` is nullopt, the scheduler will not check
// the time interval when "enable vmm swap".
// If the `checking_period` is nullopt, the scheduler will not use the
// `observation` and timer to check and control the swappable state.
ArcVmmSwapScheduler(base::RepeatingCallback<void(bool)> swap_callback,
std::optional<base::TimeDelta> minimum_swapout_interval,
std::optional<base::TimeDelta> checking_period,
std::unique_ptr<PeaceDurationProvider> observation);
ArcVmmSwapScheduler(const ArcVmmSwapScheduler&) = delete;
ArcVmmSwapScheduler& operator=(const ArcVmmSwapScheduler&) = delete;
~ArcVmmSwapScheduler() override;
void SetSwappable(bool swappable);
// ash::ConciergeClient::VmObserver override:
void OnVmSwapping(
const vm_tools::concierge::VmSwappingSignal& signal) override;
private:
friend class ArcVmmManagerBrowserTest;
void SetSwapoutThrottleInterval(base::TimeDelta interval);
void SetActiveSwappableChecking(
base::TimeDelta period,
std::unique_ptr<PeaceDurationProvider> observation);
void UpdateSwappableStateByObservation();
// Swappable state throttle args.
bool throttle_swapout_ = false;
base::TimeDelta minimum_swapout_interval_;
// Actively swappable checking args.
base::TimeDelta swappable_checking_period_;
base::RepeatingTimer swappable_checking_timer_;
std::unique_ptr<PeaceDurationProvider> peace_duration_provider_;
// Callback sends swap status to vmm manager.
base::RepeatingCallback<void(bool)> swap_callback_;
base::ScopedObservation<ash::ConciergeClient,
ash::ConciergeClient::VmObserver>
vm_observer_{this};
base::WeakPtrFactory<ArcVmmSwapScheduler> weak_ptr_factory_{this};
};
} // namespace arc
#endif // CHROME_BROWSER_ASH_ARC_VMM_ARC_VMM_SWAP_SCHEDULER_H_
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