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// Copyright 2019 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_DOWNLOAD_PUBLIC_COMMON_SIMPLE_DOWNLOAD_MANAGER_COORDINATOR_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_COMMON_SIMPLE_DOWNLOAD_MANAGER_COORDINATOR_H_
#include <memory>
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "components/download/public/common/download_export.h"
#include "components/download/public/common/download_url_parameters.h"
#include "components/download/public/common/simple_download_manager.h"
#include "components/keyed_service/core/keyed_service.h"
namespace download {
class AllDownloadEventNotifier;
class DownloadItem;
// This object allows swapping between different SimppleDownloadManager
// instances so that callers don't need to know about the swap. It can
// be created before full browser process is launched, so that download
// can be handled without full browser.
class COMPONENTS_DOWNLOAD_EXPORT SimpleDownloadManagerCoordinator
: public KeyedService,
public SimpleDownloadManager::Observer {
public:
class Observer : public base::CheckedObserver {
public:
Observer() = default;
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
~Observer() override = default;
virtual void OnManagerGoingDown(
SimpleDownloadManagerCoordinator* coordinator) {}
virtual void OnDownloadsInitialized(bool active_downloads_only) {}
virtual void OnDownloadCreated(DownloadItem* item) {}
};
using DownloadWhenFullManagerStartsCallBack =
base::RepeatingCallback<void(std::unique_ptr<DownloadUrlParameters>)>;
explicit SimpleDownloadManagerCoordinator(
const DownloadWhenFullManagerStartsCallBack&
download_when_full_manager_starts_cb);
SimpleDownloadManagerCoordinator(const SimpleDownloadManagerCoordinator&) =
delete;
SimpleDownloadManagerCoordinator& operator=(
const SimpleDownloadManagerCoordinator&) = delete;
~SimpleDownloadManagerCoordinator() override;
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
void SetSimpleDownloadManager(SimpleDownloadManager* simple_download_manager,
bool has_all_history_downloads);
// See download::DownloadUrlParameters for details about controlling the
// download.
void DownloadUrl(std::unique_ptr<DownloadUrlParameters> parameters);
// Gets all the downloads. Caller needs to call has_all_history_downloads() to
// check if all downloads are initialized. If only active downloads are
// initialized, this method will only return all active downloads.
void GetAllDownloads(
std::vector<raw_ptr<DownloadItem, VectorExperimental>>* downloads);
// Get the download item for |guid|.
DownloadItem* GetDownloadByGuid(const std::string& guid);
// Returns a non-empty notifier to be used for observing download events.
AllDownloadEventNotifier* GetNotifier();
// Whether this object is initialized.
bool initialized() const { return initialized_; }
bool has_all_history_downloads() const { return has_all_history_downloads_; }
// Checks whether downloaded files still exist. Updates state of downloads
// that refer to removed files. The check runs in the background and may
// finish asynchronously after this method returns.
void CheckForExternallyRemovedDownloads();
private:
// SimpleDownloadManager::Observer implementation.
void OnDownloadsInitialized() override;
void OnManagerGoingDown() override;
void OnDownloadCreated(DownloadItem* item) override;
raw_ptr<SimpleDownloadManager> simple_download_manager_;
// Object for notifying others about various download events.
std::unique_ptr<AllDownloadEventNotifier> notifier_;
// Whether all the history downloads are ready.
bool has_all_history_downloads_;
// Whether current SimpleDownloadManager has all history downloads.
bool current_manager_has_all_history_downloads_;
// Whether this object is initialized and active downloads are ready to be
// retrieved.
bool initialized_;
// Callback to download the url when full manager becomes ready.
DownloadWhenFullManagerStartsCallBack download_when_full_manager_starts_cb_;
// Observers that want to be notified of changes to the set of downloads.
base::ObserverList<Observer> observers_;
base::WeakPtrFactory<SimpleDownloadManagerCoordinator> weak_factory_{this};
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_COMMON_SIMPLE_DOWNLOAD_MANAGER_COORDINATOR_H_
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