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// Copyright 2022 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_PERFORMANCE_MANAGER_POLICIES_MEMORY_SAVER_MODE_POLICY_H_
#define CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_MEMORY_SAVER_MODE_POLICY_H_
#include <map>
#include <memory>
#include "base/timer/timer.h"
#include "components/performance_manager/public/decorators/tab_page_decorator.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/page_node.h"
#include "components/performance_manager/public/user_tuning/prefs.h"
namespace performance_manager::policies {
// This policy is responsible for discarding tabs after they have been
// backgrounded for a certain amount of time, when Memory Saver Mode is
// enabled by the user.
class MemorySaverModePolicy : public GraphOwned,
public PageNodeObserver,
public TabPageObserverDefaultImpl {
public:
MemorySaverModePolicy();
~MemorySaverModePolicy() override;
static MemorySaverModePolicy* GetInstance();
// PageNodeObserver:
void OnIsVisibleChanged(const PageNode* page_node) override;
// TabPageObserverDefaultImpl:
void OnTabAdded(TabPageDecorator::TabHandle* tab_handle) override;
void OnBeforeTabRemoved(TabPageDecorator::TabHandle* tab_handle) override;
// GraphOwned:
void OnPassedToGraph(Graph* graph) override;
void OnTakenFromGraph(Graph* graph) override;
void OnMemorySaverModeChanged(bool enabled);
base::TimeDelta GetTimeBeforeDiscardForTesting() const;
void SetMode(user_tuning::prefs::MemorySaverModeAggressiveness mode);
// Returns true if Memory Saver mode is enabled, false otherwise. Useful to
// get the state of the mode from the Performance Manager sequence.
bool IsMemorySaverDiscardingEnabled() const;
private:
void StartAllDiscardTimers();
void StartDiscardTimerIfEnabled(const TabPageDecorator::TabHandle* tab_handle,
base::TimeDelta time_before_discard);
void RemoveActiveTimer(const TabPageDecorator::TabHandle* tab_handle);
void DiscardPageTimerCallback(const TabPageDecorator::TabHandle* tab_handle,
base::LiveTicks posted_at,
base::TimeDelta requested_time_before_discard);
base::TimeDelta GetTimeBeforeDiscardForCurrentMode() const;
int GetMaxNumRevisitsForCurrentMode() const;
bool memory_saver_mode_enabled_ = false;
std::map<const TabPageDecorator::TabHandle*, base::OneShotTimer>
active_discard_timers_;
user_tuning::prefs::MemorySaverModeAggressiveness mode_ =
user_tuning::prefs::MemorySaverModeAggressiveness::kMedium;
};
} // namespace performance_manager::policies
#endif // CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_MEMORY_SAVER_MODE_POLICY_H_
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