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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.
#ifndef CHROME_BROWSER_PRELOADING_SEARCH_PRELOAD_SEARCH_PRELOAD_SERVICE_H_
#define CHROME_BROWSER_PRELOADING_SEARCH_PRELOAD_SEARCH_PRELOAD_SERVICE_H_
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "chrome/browser/preloading/search_preload/search_preload_pipeline_manager.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/search_engines/template_url_service_observer.h"
class AutocompleteResult;
class Profile;
class TemplateURLService;
struct AutocompleteMatch;
namespace content {
class WebContents;
}
namespace omnibox::mojom {
enum class NavigationPredictor;
}
// Roles:
//
// - Observes changes of `TemplateURLService` and notifies it to
// `SearchPreloadPipelineManager`s.
// - Routes Omnibox events to `SearchPreloadPipelineManager`s.
//
// Note that
//
// - Prerender is managed per `WebContents` and we must trigger prerender for
// appropriate `WebContents`; and
// - Prefetch is managed per `BrowserContext` and it's (theoretically) available
// even we trigger prefetches over different `WebContents`s.
// - Note that current behavior of `PrefetchHandle` is
// `PrefetchHandle::dtor()` immediately destroys `PrefetchContainer` and
// it's actually not available.
//
// So, we manage pipelines in `SearchPreloadPipelineManager` per `WebContents`.
// It's for the necessity of prerender and the simplicity of prefetch.
class SearchPreloadService : public KeyedService,
public TemplateURLServiceObserver {
public:
static SearchPreloadService* GetForProfile(Profile* profile);
explicit SearchPreloadService(Profile* profile);
~SearchPreloadService() override;
// Not movable nor copyable.
SearchPreloadService(const SearchPreloadService&&) = delete;
SearchPreloadService& operator=(const SearchPreloadService&&) = delete;
SearchPreloadService(const SearchPreloadService&) = delete;
SearchPreloadService& operator=(const SearchPreloadService&) = delete;
base::WeakPtr<SearchPreloadService> GetWeakPtr() {
return weak_factory_.GetWeakPtr();
}
// KeyedService:
void Shutdown() override;
// TemplateURLServiceObserver:
//
// Monitors changes to DSE. If a change occurs, clears preloads.
void OnTemplateURLServiceChanged() override;
// Clears all preloads from the service.
void ClearPreloads();
// Called when autocomplete is updated.
void OnAutocompleteResultChanged(content::WebContents* web_contents,
const AutocompleteResult& result);
// Called when a user is likely navigate to the match.
bool OnNavigationLikely(
size_t index,
const AutocompleteMatch& match,
omnibox::mojom::NavigationPredictor navigation_predictor,
content::WebContents* web_contents);
private:
// Reference is valid only as rvalue.
SearchPreloadPipelineManager& GetOrCreatePipelineManagerWithLimit(
content::WebContents& web_contents);
base::ScopedObservation<TemplateURLService, TemplateURLServiceObserver>
observer_{this};
const raw_ptr<Profile> profile_;
std::optional<base::WeakPtr<SearchPreloadPipelineManager>> pipeline_manager_;
base::WeakPtrFactory<SearchPreloadService> weak_factory_{this};
};
#endif // CHROME_BROWSER_PRELOADING_SEARCH_PRELOAD_SEARCH_PRELOAD_SERVICE_H_
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