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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
#define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/offline_pages/offline_page_archiver.h"
class GURL;
namespace base {
class SequencedTaskRunner;
}
namespace offline_pages {
struct OfflinePageItem;
class OfflinePageMetadataStore;
// Service for saving pages offline, storing the offline copy and metadata, and
// retrieving them upon request.
//
// Example usage:
// class ArchiverImpl : public OfflinePageArchiver {
// // This is a class that knows how to create archiver
// void CreateArchiver(...) override;
// ...
// }
//
// // In code using the OfflinePagesModel to save a page:
// scoped_ptr<ArchiverImpl> archiver(new ArchiverImpl());
// // Callback is of type SavePageCallback.
// model->SavePage(url, archiver.Pass(), callback);
//
// TODO(fgorski): Things to describe:
// * how to cancel requests and what to expect
class OfflinePageModel : public KeyedService {
public:
// Result of saving a page offline.
// A Java counterpart will be generated for this enum.
// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.components.offline_pages
enum class SavePageResult {
SUCCESS,
CANCELLED,
DEVICE_FULL,
CONTENT_UNAVAILABLE,
ARCHIVE_CREATION_FAILED,
STORE_FAILURE,
ALREADY_EXISTS,
};
// Result of deleting an offline page.
// A Java counterpart will be generated for this enum.
// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.components.offline_pages
enum class DeletePageResult {
SUCCESS,
CANCELLED,
STORE_FAILURE,
DEVICE_FAILURE,
NOT_FOUND,
};
// Result of loading all pages.
// A Java counterpart will be generated for this enum.
// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.components.offline_pages
enum class LoadResult {
SUCCESS,
CANCELLED,
STORE_FAILURE,
};
// Observer of the OfflinePageModel.
class Observer {
public:
// Invoked when the model has finished loading.
virtual void OfflinePageModelLoaded(OfflinePageModel* model) = 0;
protected:
virtual ~Observer() {}
};
typedef base::Callback<void(SavePageResult)> SavePageCallback;
typedef base::Callback<void(DeletePageResult)> DeletePageCallback;
// All blocking calls/disk access will happen on the provided |task_runner|.
OfflinePageModel(
scoped_ptr<OfflinePageMetadataStore> store,
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
~OfflinePageModel() override;
// KeyedService implementation.
void Shutdown() override;
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Attempts to save a page addressed by |url| offline. Requires that the model
// is loaded.
void SavePage(const GURL& url,
int64 bookmark_id,
scoped_ptr<OfflinePageArchiver> archiver,
const SavePageCallback& callback);
// Deletes an offline page related to the passed |bookmark_id|. Requires that
// the model is loaded.
void DeletePageByBookmarkId(int64 bookmark_id,
const DeletePageCallback& callback);
// Gets all available offline pages. Requires that the model is loaded.
const std::vector<OfflinePageItem>& GetAllPages() const;
// Gets an offline page associated with a specified |bookmark_id|. Returns
// true if a matching offline page exists, and |offline_page| will be updated
// with corresponding value, or false, if no offline page was found.
bool GetPageByBookmarkId(int64 bookmark_id,
OfflinePageItem* offline_page) const;
// Methods for testing only:
OfflinePageMetadataStore* GetStoreForTesting();
bool is_loaded() const { return is_loaded_; }
private:
typedef ScopedVector<OfflinePageArchiver> PendingArchivers;
void DeletePage(const OfflinePageItem& offline_page,
const DeletePageCallback& callback);
// Callback for loading pages from the offline page metadata store.
void OnLoadDone(bool success,
const std::vector<OfflinePageItem>& offline_pages);
// Steps for saving a page offline.
void OnCreateArchiveDone(const GURL& requested_url,
int64 bookmark_id,
const SavePageCallback& callback,
OfflinePageArchiver* archiver,
OfflinePageArchiver::ArchiverResult result,
const GURL& url,
const base::FilePath& file_path,
int64 file_size);
void OnAddOfflinePageDone(OfflinePageArchiver* archiver,
const SavePageCallback& callback,
const OfflinePageItem& offline_page,
bool success);
void InformSavePageDone(const SavePageCallback& callback,
SavePageResult result);
void DeletePendingArchiver(OfflinePageArchiver* archiver);
// Steps for deleting files and data for an offline page.
void OnDeleteArchiverFileDone(
const GURL& url,
const DeletePageCallback& callback,
const bool* success);
void OnRemoveOfflinePageDone(const GURL& url,
const DeletePageCallback& callback,
bool success);
// Persistent store for offline page metadata.
scoped_ptr<OfflinePageMetadataStore> store_;
// The observers.
base::ObserverList<Observer> observers_;
bool is_loaded_;
// In memory copy of the offline page metadata.
std::vector<OfflinePageItem> offline_pages_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// Pending archivers owned by this model.
PendingArchivers pending_archivers_;
base::WeakPtrFactory<OfflinePageModel> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(OfflinePageModel);
};
} // namespace offline_pages
#endif // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
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