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// Copyright 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 COMPONENTS_SYNC_SYNCABLE_READ_TRANSACTION_H_
#define COMPONENTS_SYNC_SYNCABLE_READ_TRANSACTION_H_
#include <stddef.h>
#include <stdint.h>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "components/sync/model/attachments/attachment_id.h"
#include "components/sync/syncable/base_transaction.h"
namespace tracked_objects {
class Location;
} // namespace tracked_objects
namespace sync_pb {
class DataTypeContext;
}
namespace syncer {
struct UserShare;
// Sync API's ReadTransaction is a read-only BaseTransaction. It wraps
// a syncable::ReadTransaction.
class ReadTransaction : public BaseTransaction {
public:
// Start a new read-only transaction on the specified repository.
ReadTransaction(const tracked_objects::Location& from_here, UserShare* share);
// Resume the middle of a transaction. Will not close transaction.
ReadTransaction(UserShare* share, syncable::BaseTransaction* trans);
~ReadTransaction() override;
// BaseTransaction override.
syncable::BaseTransaction* GetWrappedTrans() const override;
// Return |transaction_version| of |type| stored in sync directory's
// persisted info.
int64_t GetModelVersion(ModelType type) const;
// Fills |context| with the datatype context associated with |type|.
void GetDataTypeContext(ModelType type,
sync_pb::DataTypeContext* context) const;
// Clear |ids| and fill it with the ids of attachments that need to be
// uploaded to the sync server.
void GetAttachmentIdsToUpload(ModelType type, AttachmentIdList* ids) const;
// Return the current (opaque) store birthday.
std::string GetStoreBirthday() const;
private:
void* operator new(size_t size); // Transaction is meant for stack use only.
// The underlying syncable object which this class wraps.
syncable::BaseTransaction* transaction_;
bool close_transaction_;
DISALLOW_COPY_AND_ASSIGN(ReadTransaction);
};
} // namespace syncer
#endif // COMPONENTS_SYNC_SYNCABLE_READ_TRANSACTION_H_
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