page_discarding_helper.h | Explore in Territory

// Copyright 2020 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_PAGE_DISCARDING_HELPER_H_
#define CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_PAGE_DISCARDING_HELPER_H_

#include <optional>

#include "base/functional/callback_forward.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/performance_manager/mechanisms/page_discarder.h"
#include "chrome/browser/resource_coordinator/lifecycle_unit_state.mojom-shared.h"
#include "components/memory_pressure/reclaim_target.h"
#include "components/memory_pressure/unnecessary_discard_monitor.h"
#include "components/performance_manager/public/decorators/page_live_state_decorator.h"
#include "components/performance_manager/public/features.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/graph_registered.h"
#include "components/performance_manager/public/graph/node_data_describer.h"
#include "components/performance_manager/public/graph/page_node.h"

namespace url_matcher {
class URLMatcher;
}  // namespace url_matcher

namespace performance_manager {

namespace mechanism {
class PageDiscarder;
}  // namespace mechanism

namespace policies {

#if BUILDFLAG(IS_CHROMEOS)
constexpr base::TimeDelta kNonVisiblePagesUrgentProtectionTime =
    base::TimeDelta();
#else
// Time during which non visible pages are protected from urgent discarding
// (not on ChromeOS).
constexpr base::TimeDelta kNonVisiblePagesUrgentProtectionTime = …;
#endif

// Time during which a tab cannot be discarded after having played audio.
constexpr base::TimeDelta kTabAudioProtectionTime = …;

// Caches page node properties to facilitate sorting.
class PageNodeSortProxy { … };

// Helper class to be used by the policies that want to discard tabs.
//
// This is a GraphRegistered object and should be accessed via
// PageDiscardingHelper::GetFromGraph(graph()).
class PageDiscardingHelper
    : public GraphOwnedAndRegistered<PageDiscardingHelper>,
      public NodeDataDescriberDefaultImpl { … };

}  // namespace policies

}  // namespace performance_manager

#endif  // CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_PAGE_DISCARDING_HELPER_H_
chromium/chrome/browser/performance_manager/policies/page_discarding_helper.h
