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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_AI_AI_MODEL_DOWNLOAD_PROGRESS_MANAGER_H_
#define CHROME_BROWSER_AI_AI_MODEL_DOWNLOAD_PROGRESS_MANAGER_H_
#include <memory>
#include "base/containers/unique_ptr_adapters.h"
#include "base/memory/raw_ref.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "components/component_updater/component_updater_service.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/mojom/ai/model_download_progress_observer.mojom.h"
namespace on_device_ai {
// Manages a set of `ModelDownloadProgressObserver`s and sends them download
// progress updates for their respective components.
class AIModelDownloadProgressManager {
public:
AIModelDownloadProgressManager();
~AIModelDownloadProgressManager();
// Not copyable or movable.
AIModelDownloadProgressManager(const AIModelDownloadProgressManager&) =
delete;
AIModelDownloadProgressManager& operator=(
const AIModelDownloadProgressManager&) = delete;
// Adds a `ModelDownloadProgressObserver` to send progress updates for
// `component_ids`.
void AddObserver(
component_updater::ComponentUpdateService* component_update_service,
mojo::PendingRemote<blink::mojom::ModelDownloadProgressObserver>
observer_remote,
base::flat_set<std::string> component_ids);
int GetNumberOfReporters();
private:
// Observes progress updates from the `component_update_service`, filters and
// processes them, and reports the result to `observer_remote`.
class Reporter : public component_updater::ServiceObserver {
public:
Reporter(
AIModelDownloadProgressManager& manager,
component_updater::ComponentUpdateService* component_update_service,
mojo::PendingRemote<blink::mojom::ModelDownloadProgressObserver>
observer_remote,
base::flat_set<std::string> component_ids);
~Reporter() override;
// Not copyable or movable.
Reporter(const Reporter&) = delete;
Reporter& operator=(const Reporter&) = delete;
// component_updater::ServiceObserver:
void OnEvent(const component_updater::CrxUpdateItem& item) override;
private:
void OnRemoteDisconnect();
void ProcessEvent(const component_updater::CrxUpdateItem& item);
int64_t GetDownloadedBytes();
// `manager_` owns `this`.
base::raw_ref<AIModelDownloadProgressManager> manager_;
mojo::Remote<blink::mojom::ModelDownloadProgressObserver> observer_remote_;
base::ScopedObservation<component_updater::ComponentUpdateService,
component_updater::ComponentUpdateService::Observer>
component_updater_observation_{this};
// The ids of the components we're reporting the progress for.
base::flat_set<std::string> component_ids_;
// Map of the components to their observed downloaded bytes. Also serves as
// a way to keep track of what components we've observed the total bytes of.
std::map<std::string, int64_t> observed_downloaded_bytes_;
// Sum of all observed components' total_bytes.
int64_t components_total_bytes_ = 0;
// The bytes already downloaded before we determined the `total_bytes_`.
int64_t already_downloaded_bytes_ = 0;
// True if we know the total bytes of the components we'll be watching.
// Meaning we can start reporting.
bool ready_to_report_ = false;
int last_reported_progress_ = 0;
base::TimeTicks last_progress_time_;
base::WeakPtrFactory<Reporter> weak_ptr_factory_{this};
};
void RemoveReporter(Reporter* reporter);
base::flat_set<std::unique_ptr<Reporter>, base::UniquePtrComparator>
reporters_;
};
} // namespace on_device_ai
#endif // CHROME_BROWSER_AI_AI_MODEL_DOWNLOAD_PROGRESS_MANAGER_H_
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