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// Copyright 2024 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_EXECUTION_CONTEXT_PRIORITY_LOADING_PAGE_VOTER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_EXECUTION_CONTEXT_PRIORITY_LOADING_PAGE_VOTER_H_
#include "components/performance_manager/public/execution_context_priority/execution_context_priority.h"
#include "components/performance_manager/public/execution_context_priority/priority_voting_system.h"
#include "components/performance_manager/public/graph/frame_node.h"
#include "components/performance_manager/public/graph/page_node.h"
namespace performance_manager::execution_context_priority {
// This voter casts a TaskPriority::USER_BLOCKING vote to all frames that are
// part of a loading page. This makes switching to a loading tab faster.
// Note: This FrameNodeObserver can affect the initial priority of a frame and
// thus uses `OnBeforeFrameNodeAdded`.
class LoadingPageVoter : public PriorityVoter,
public PageNodeObserver,
public FrameNodeObserver {
public:
static const char kPageIsLoadingReason[];
explicit LoadingPageVoter();
~LoadingPageVoter() override;
LoadingPageVoter(const LoadingPageVoter&) = delete;
LoadingPageVoter& operator=(const LoadingPageVoter&) = delete;
// PriorityVoter:
void InitializeOnGraph(Graph* graph, VotingChannel voting_channel) override;
void TearDownOnGraph(Graph* graph) override;
// PageNodeObserver:
void OnPageNodeAdded(const PageNode* page_node) override;
void OnBeforePageNodeRemoved(const PageNode* page_node) override;
void OnLoadingStateChanged(const PageNode* page_node,
PageNode::LoadingState previous_state) override;
// FrameNodeObserver:
void OnBeforeFrameNodeAdded(
const FrameNode* frame_node,
const FrameNode* pending_parent_frame_node,
const PageNode* pending_page_node,
const ProcessNode* pending_process_node,
const FrameNode* pending_parent_or_outer_document_or_embedder) override;
void OnBeforeFrameNodeRemoved(const FrameNode* frame_node) override;
VoterId voter_id() const { return voting_channel_.voter_id(); }
private:
// Called when a page node starts/stops loading, which will submit/invalidate
// a vote for every frame in that page, respectively.
void OnPageNodeStartedLoading(const PageNode* page_node);
void OnPageNodeStoppedLoading(const PageNode* page_node);
// Submits/Invalidates a vote for `frame_node` and its subtree.
void SubmitVoteForSubtree(const FrameNode* frame_node);
void InvalidateVoteForSubtree(const FrameNode* frame_node);
VotingChannel voting_channel_;
};
} // namespace performance_manager::execution_context_priority
#endif // COMPONENTS_PERFORMANCE_MANAGER_EXECUTION_CONTEXT_PRIORITY_LOADING_PAGE_VOTER_H_
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