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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.
#include "components/performance_manager/execution_context_priority/loading_page_voter.h"
#include <utility>
#include "components/performance_manager/public/execution_context/execution_context_registry.h"
#include "components/performance_manager/public/graph/graph.h"
namespace performance_manager::execution_context_priority {
namespace {
const execution_context::ExecutionContext* GetExecutionContext(
const FrameNode* frame_node) {
return execution_context::ExecutionContextRegistry::GetFromGraph(
frame_node->GetGraph())
->GetExecutionContextForFrameNode(frame_node);
}
// Returns true if `loading_state` represent an actively loading state.
bool IsLoading(PageNode::LoadingState loading_state) {
return loading_state == PageNode::LoadingState::kLoading ||
loading_state == PageNode::LoadingState::kLoadedBusy;
}
} // namespace
// static
const char LoadingPageVoter::kPageIsLoadingReason[] = "Page is loading.";
LoadingPageVoter::LoadingPageVoter() = default;
LoadingPageVoter::~LoadingPageVoter() = default;
void LoadingPageVoter::InitializeOnGraph(Graph* graph,
VotingChannel voting_channel) {
voting_channel_ = std::move(voting_channel);
graph->AddPageNodeObserver(this);
graph->AddFrameNodeObserver(this);
}
void LoadingPageVoter::TearDownOnGraph(Graph* graph) {
graph->RemoveFrameNodeObserver(this);
graph->RemovePageNodeObserver(this);
voting_channel_.Reset();
}
void LoadingPageVoter::OnPageNodeAdded(const PageNode* page_node) {
if (!IsLoading(page_node->GetLoadingState())) {
return;
}
OnPageNodeStartedLoading(page_node);
}
void LoadingPageVoter::OnBeforePageNodeRemoved(const PageNode* page_node) {
if (!IsLoading(page_node->GetLoadingState())) {
return;
}
OnPageNodeStoppedLoading(page_node);
}
void LoadingPageVoter::OnLoadingStateChanged(
const PageNode* page_node,
PageNode::LoadingState previous_state) {
const bool was_loading = IsLoading(previous_state);
const bool is_loading = IsLoading(page_node->GetLoadingState());
if (was_loading && !is_loading) {
OnPageNodeStoppedLoading(page_node);
}
if (!was_loading && is_loading) {
OnPageNodeStartedLoading(page_node);
}
}
void LoadingPageVoter::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) {
if (!IsLoading(pending_page_node->GetLoadingState())) {
return;
}
voting_channel_.SubmitVote(
GetExecutionContext(frame_node),
Vote(base::TaskPriority::USER_VISIBLE, kPageIsLoadingReason));
}
void LoadingPageVoter::OnBeforeFrameNodeRemoved(const FrameNode* frame_node) {
if (!IsLoading(frame_node->GetPageNode()->GetLoadingState())) {
return;
}
voting_channel_.InvalidateVote(GetExecutionContext(frame_node));
}
void LoadingPageVoter::OnPageNodeStartedLoading(const PageNode* page_node) {
for (const FrameNode* main_frame_node : page_node->GetMainFrameNodes()) {
SubmitVoteForSubtree(main_frame_node);
}
}
void LoadingPageVoter::OnPageNodeStoppedLoading(const PageNode* page_node) {
for (const FrameNode* main_frame_node : page_node->GetMainFrameNodes()) {
InvalidateVoteForSubtree(main_frame_node);
}
}
void LoadingPageVoter::SubmitVoteForSubtree(const FrameNode* frame_node) {
voting_channel_.SubmitVote(
GetExecutionContext(frame_node),
Vote(base::TaskPriority::USER_VISIBLE, kPageIsLoadingReason));
// Recurse through subtree.
for (const FrameNode* child_frame_node : frame_node->GetChildFrameNodes()) {
SubmitVoteForSubtree(child_frame_node);
}
}
void LoadingPageVoter::InvalidateVoteForSubtree(const FrameNode* frame_node) {
voting_channel_.InvalidateVote(GetExecutionContext(frame_node));
// Recurse through subtree.
for (const FrameNode* child_frame_node : frame_node->GetChildFrameNodes()) {
InvalidateVoteForSubtree(child_frame_node);
}
}
} // namespace performance_manager::execution_context_priority
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