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// Copyright 2017 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_SYNC_BOOKMARKS_BOOKMARK_MODEL_TYPE_CONTROLLER_H_
#define COMPONENTS_SYNC_BOOKMARKS_BOOKMARK_MODEL_TYPE_CONTROLLER_H_
#include <memory>
#include "base/macros.h"
#include "components/sync/driver/data_type_controller.h"
#include "components/sync/engine/activation_context.h"
namespace syncer {
class SyncClient;
} // namespace syncer
namespace sync_bookmarks {
class BookmarkModelTypeProcessor;
// A class that manages the startup and shutdown of bookmark sync implemented
// through USS APIs.
class BookmarkModelTypeController : public syncer::DataTypeController {
public:
explicit BookmarkModelTypeController(syncer::SyncClient* sync_client);
~BookmarkModelTypeController() override;
// syncer::DataTypeController implementation.
bool ShouldLoadModelBeforeConfigure() const override;
void BeforeLoadModels(syncer::ModelTypeConfigurer* configurer) override;
void LoadModels(const ModelLoadCallback& model_load_callback) override;
void RegisterWithBackend(base::Callback<void(bool)> set_downloaded,
syncer::ModelTypeConfigurer* configurer) override;
void StartAssociating(const StartCallback& start_callback) override;
void ActivateDataType(syncer::ModelTypeConfigurer* configurer) override;
void DeactivateDataType(syncer::ModelTypeConfigurer* configurer) override;
void Stop() override;
State state() const override;
void GetAllNodes(const AllNodesCallback& callback) override;
void GetStatusCounters(const StatusCountersCallback& callback) override;
void RecordMemoryUsageHistogram() override;
private:
friend class BookmarkModelTypeControllerTest;
// Returns true if both BookmarkModel and HistoryService are loaded.
bool DependenciesLoaded();
// Reads ModelTypeState from storage and creates BookmarkModelTypeProcessor.
std::unique_ptr<syncer::ActivationContext> PrepareActivationContext();
// SyncClient provides access to BookmarkModel, HistoryService and
// SyncService.
syncer::SyncClient* sync_client_;
// State of this datatype controller.
State state_;
// BookmarkModelTypeProcessor handles communications between sync engine and
// BookmarkModel/HistoryService.
std::unique_ptr<BookmarkModelTypeProcessor> model_type_processor_;
// This is a hack to prevent reconfigurations from crashing, because USS
// activation is not idempotent. RegisterWithBackend only needs to actually do
// something the first time after the type is enabled.
// TODO(crbug.com/647505): Remove this once the DTM handles things better.
bool activated_ = false;
DISALLOW_COPY_AND_ASSIGN(BookmarkModelTypeController);
};
} // namespace sync_bookmarks
#endif // COMPONENTS_SYNC_BOOKMARKS_BOOKMARK_MODEL_TYPE_CONTROLLER_H_
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