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// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_BACKEND_H_
#define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_BACKEND_H_
#pragma once
#include "base/compiler_specific.h"
#include "base/file_path.h"
#include "base/memory/linked_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list_threadsafe.h"
#include "chrome/browser/extensions/settings/settings_observer.h"
#include "chrome/browser/extensions/settings/settings_storage_factory.h"
#include "chrome/browser/extensions/settings/settings_storage_quota_enforcer.h"
#include "chrome/browser/extensions/settings/syncable_settings_storage.h"
#include "chrome/browser/value_store/leveldb_value_store.h"
#include "sync/api/syncable_service.h"
namespace syncer {
class SyncErrorFactory;
}
namespace extensions {
// Manages ValueStore objects for extensions, including routing
// changes from sync to them.
// Lives entirely on the FILE thread.
class SettingsBackend : public syncer::SyncableService {
public:
// |storage_factory| is use to create leveldb storage areas.
// |base_path| is the base of the extension settings directory, so the
// databases will be at base_path/extension_id.
// |observers| is the list of observers to settings changes.
SettingsBackend(
const scoped_refptr<SettingsStorageFactory>& storage_factory,
const FilePath& base_path,
const SettingsStorageQuotaEnforcer::Limits& quota,
const scoped_refptr<SettingsObserverList>& observers);
virtual ~SettingsBackend();
// Gets a weak reference to the storage area for |extension_id|.
// Must be run on the FILE thread.
ValueStore* GetStorage(const std::string& extension_id) const;
// Deletes all setting data for an extension. Call on the FILE thread.
void DeleteStorage(const std::string& extension_id);
// syncer::SyncableService implementation.
virtual syncer::SyncDataList GetAllSyncData(
syncer::ModelType type) const OVERRIDE;
virtual syncer::SyncError MergeDataAndStartSyncing(
syncer::ModelType type,
const syncer::SyncDataList& initial_sync_data,
scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
scoped_ptr<syncer::SyncErrorFactory> sync_error_factory) OVERRIDE;
virtual syncer::SyncError ProcessSyncChanges(
const tracked_objects::Location& from_here,
const syncer::SyncChangeList& change_list) OVERRIDE;
virtual void StopSyncing(syncer::ModelType type) OVERRIDE;
private:
// Gets a weak reference to the storage area for a given extension,
// initializing sync with some initial data if sync enabled.
SyncableSettingsStorage* GetOrCreateStorageWithSyncData(
const std::string& extension_id,
const DictionaryValue& sync_data) const;
// Gets all extension IDs known to extension settings. This may not be all
// installed extensions.
std::set<std::string> GetKnownExtensionIDs() const;
// Creates a new SettingsSyncProcessor for an extension.
scoped_ptr<SettingsSyncProcessor> CreateSettingsSyncProcessor(
const std::string& extension_id) const;
// The Factory to use for creating leveldb storage areas.
const scoped_refptr<SettingsStorageFactory> storage_factory_;
// The base file path to create any leveldb databases at.
const FilePath base_path_;
// Quota limits (see SettingsStorageQuotaEnforcer).
const SettingsStorageQuotaEnforcer::Limits quota_;
// The list of observers to settings changes.
const scoped_refptr<SettingsObserverList> observers_;
// A cache of ValueStore objects that have already been created.
// Ensure that there is only ever one created per extension.
typedef std::map<std::string, linked_ptr<SyncableSettingsStorage> >
StorageObjMap;
mutable StorageObjMap storage_objs_;
// Current sync model type. Will be UNSPECIFIED if sync hasn't been enabled
// yet, and either SETTINGS or APP_SETTINGS if it has been.
syncer::ModelType sync_type_;
// Current sync processor, if any.
scoped_ptr<syncer::SyncChangeProcessor> sync_processor_;
// Current sync error handler if any.
scoped_ptr<syncer::SyncErrorFactory> sync_error_factory_;
DISALLOW_COPY_AND_ASSIGN(SettingsBackend);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_BACKEND_H_
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