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// Copyright 2021 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_PERFORMANCE_MANAGER_GRAPH_POLICIES_BFCACHE_POLICY_H_
#define COMPONENTS_PERFORMANCE_MANAGER_GRAPH_POLICIES_BFCACHE_POLICY_H_
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/system_node.h"
namespace performance_manager::policies {
// Policies that automatically flush the BFCache of pages when the system is
// under memory pressure.
class BFCachePolicy : public GraphOwned, public SystemNodeObserver {
public:
BFCachePolicy() = default;
BFCachePolicy(const BFCachePolicy&) = delete;
BFCachePolicy(BFCachePolicy&&) = delete;
BFCachePolicy& operator=(const BFCachePolicy&) = delete;
BFCachePolicy& operator=(BFCachePolicy&&) = delete;
~BFCachePolicy() override = default;
protected:
using MemoryPressureLevel = base::MemoryPressureListener::MemoryPressureLevel;
// Try to flush the BFCache associated with |page_node|. This will be a no-op
// if there's a pending navigation.
virtual void MaybeFlushBFCache(const PageNode* page_node,
MemoryPressureLevel memory_pressure_level);
private:
// GraphOwned implementation:
void OnPassedToGraph(Graph* graph) override;
void OnTakenFromGraph(Graph* graph) override;
// SystemNodeObserver:
void OnMemoryPressure(MemoryPressureLevel new_level) override;
};
} // namespace performance_manager::policies
#endif // COMPONENTS_PERFORMANCE_MANAGER_GRAPH_POLICIES_BFCACHE_POLICY_H_
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