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// Copyright (c) 2011 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_EXTENSION_SETTINGS_BACKEND_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_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/task.h"
#include "chrome/browser/extensions/syncable_extension_settings_storage.h"
#include "chrome/browser/sync/api/syncable_service.h"
// Manages ExtensionSettingsStorage objects for extensions, including routing
// changes from sync to them.
// Lives entirely on the FILE thread.
class ExtensionSettingsBackend : public SyncableService {
public:
// File path is the base of the extension settings directory.
// The databases will be at base_path/extension_id.
explicit ExtensionSettingsBackend(const FilePath& base_path);
virtual ~ExtensionSettingsBackend();
// Gets a weak reference to the storage area for a given extension.
// Must be run on the FILE thread.
//
// By default this will be an ExtensionSettingsLeveldbStorage, but on
// failure to create a leveldb instance will fall back to
// InMemoryExtensionSettingsStorage.
ExtensionSettingsStorage* GetStorage(
const std::string& extension_id) const;
// Deletes all setting data for an extension. Call on the FILE thread.
void DeleteExtensionData(const std::string& extension_id);
// SyncableService implementation.
virtual SyncDataList GetAllSyncData(syncable::ModelType type) const OVERRIDE;
virtual SyncError MergeDataAndStartSyncing(
syncable::ModelType type,
const SyncDataList& initial_sync_data,
SyncChangeProcessor* sync_processor) OVERRIDE;
virtual SyncError ProcessSyncChanges(
const tracked_objects::Location& from_here,
const SyncChangeList& change_list) OVERRIDE;
virtual void StopSyncing(syncable::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.
//
// By default this will be of a cached LEVELDB storage, but on failure to
// create a leveldb instance will fall back to cached NOOP storage.
SyncableExtensionSettingsStorage* 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;
// The base file path to create any leveldb databases at.
const FilePath base_path_;
// A cache of ExtensionSettingsStorage objects that have already been created.
// Ensure that there is only ever one created per extension.
typedef std::map<std::string, linked_ptr<SyncableExtensionSettingsStorage> >
StorageObjMap;
mutable StorageObjMap storage_objs_;
// Current sync processor, if any.
SyncChangeProcessor* sync_processor_;
DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsBackend);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_BACKEND_H_
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