components/sync/engine_impl/uss_migrator.h

// Copyright 2016 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_ENGINE_IMPL_USS_MIGRATOR_H_
#define COMPONENTS_SYNC_ENGINE_IMPL_USS_MIGRATOR_H_

#include "base/callback.h"
#include "components/sync/base/model_type.h"

namespace syncer {

class ModelTypeWorker;
struct UserShare;

using UssMigrator = base::RepeatingCallback<
    bool(ModelType, UserShare*, ModelTypeWorker*, int*)>;

// Pulls all the data for |type| out of the directory and sends it to |worker|
// as the result of an initial GetUpdates. Returns whether migration succeeded.
// |user_share|, |worker| and |migrated_entity_count| must not be null.
bool MigrateDirectoryData(ModelType type,
                          UserShare* user_share,
                          ModelTypeWorker* worker,
                          int* migrated_entity_count);

// A version of the above with |batch_size| as a parameter so it can be lowered
// for unit testing.
bool MigrateDirectoryDataWithBatchSizeForTesting(
    ModelType type,
    int batch_size,
    UserShare* user_share,
    ModelTypeWorker* worker,
    int* cumulative_migrated_entity_count);

}  // namespace syncer

#endif  // COMPONENTS_SYNC_ENGINE_IMPL_USS_MIGRATOR_H_