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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/passage_embeddings/web_contents_passage_embedder.h"
#include <utility>
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "content/public/browser/web_contents.h"
namespace passage_embeddings {
WebContentsPassageEmbedder::WebContentsPassageEmbedder(
content::WebContents* web_contents,
Delegate& delegate)
: WebContentsObserver(web_contents), delegate_(delegate) {}
WebContentsPassageEmbedder::~WebContentsPassageEmbedder() {
if (current_task_id_) {
delegate_->TryCancel(*current_task_id_);
}
}
void WebContentsPassageEmbedder::WebContentsDestroyed() {
delegate_->OnWebContentsDestroyed(web_contents());
// The object may be destroyed at this point.
}
void WebContentsPassageEmbedder::ComputeEmbeddings(
std::vector<std::string> passages) {
if (current_task_id_) {
delegate_->TryCancel(*current_task_id_);
}
current_task_id_ = delegate_->ComputePassagesEmbeddings(
std::move(passages),
base::BindOnce(&WebContentsPassageEmbedder::OnPassageEmbeddingsComputed,
weak_ptr_factory_.GetWeakPtr()));
}
void WebContentsPassageEmbedder::OnPassageEmbeddingsComputed(
std::vector<std::string> passages,
std::vector<Embedding> embeddings,
Embedder::TaskId task_id,
ComputeEmbeddingsStatus status) {
VLOG(2) << "Got " << embeddings.size() << " embeddings with status "
<< static_cast<int>(status) << " for task " << task_id;
if (task_id == current_task_id_) {
current_task_id_.reset();
} else {
if (status == ComputeEmbeddingsStatus::kSuccess) {
base::UmaHistogramCounts100("History.Embeddings.StaleComputedEmbeddings",
embeddings.size());
}
}
}
WebContentsImmediatePassageEmbedder::WebContentsImmediatePassageEmbedder(
content::WebContents* web_contents,
Delegate& delegate)
: WebContentsPassageEmbedder(web_contents, delegate) {}
void WebContentsImmediatePassageEmbedder::AcceptPassages(
std::vector<std::string> passages) {
ComputeEmbeddings(std::move(passages));
}
WebContentsBackgroundPassageEmbedder::WebContentsBackgroundPassageEmbedder(
content::WebContents* web_contents,
Delegate& delegate)
: WebContentsPassageEmbedder(web_contents, delegate) {}
WebContentsBackgroundPassageEmbedder::~WebContentsBackgroundPassageEmbedder() =
default;
void WebContentsBackgroundPassageEmbedder::OnVisibilityChanged(
content::Visibility visibility) {
web_contents_visibility_ = visibility;
// Compute embeddings for any pending passages when transitioning to HIDDEN
// visibility.
if (web_contents_visibility_ == content::Visibility::HIDDEN &&
!pending_passages_.empty()) {
ComputeEmbeddings(std::move(pending_passages_));
pending_passages_.clear();
}
}
void WebContentsBackgroundPassageEmbedder::AcceptPassages(
std::vector<std::string> passages) {
if (web_contents_visibility_ == content::Visibility::HIDDEN) {
// The WebContents may have transitioned from VISIBLE to HIDDEN by the time
// we received the passages, so compute embeddings.
ComputeEmbeddings(std::move(passages));
pending_passages_.clear();
} else {
// Store the passages for a possible later embeddings computation on
// transition to HIDDEN.
pending_passages_ = passages;
}
}
void WebContentsBackgroundPassageEmbedder::
MaybeProcessPendingPassagesOnPriorityIncrease() {
// Force processing of passages for non-hidden tabs, since we need embeddings
// for all WebContents the user has seen at high priority.
if (!pending_passages_.empty() &&
web_contents()->GetVisibility() != content::Visibility::HIDDEN) {
ComputeEmbeddings(std::move(pending_passages_));
pending_passages_.clear();
}
}
} // namespace passage_embeddings
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