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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 SYNC_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_
#define SYNC_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "sync/base/sync_export.h"
#include "sync/internal_api/public/base_transaction.h"
namespace tracked_objects {
class Location;
} // namespace tracked_objects
namespace syncer {
namespace syncable {
class BaseTransaction;
class WriteTransaction;
} // namespace syncable
// Sync API's WriteTransaction is a read/write BaseTransaction. It wraps
// a syncable::WriteTransaction.
//
// NOTE: Only a single model type can be mutated for a given
// WriteTransaction.
class SYNC_EXPORT WriteTransaction : public BaseTransaction {
public:
// Start a new read/write transaction.
WriteTransaction(const tracked_objects::Location& from_here,
UserShare* share);
// |transaction_version| stores updated model and nodes version if model
// is changed by the transaction, or syncer::syncable::kInvalidTransaction
// if not after transaction is closed. This constructor is used for model
// types that support embassy data.
WriteTransaction(const tracked_objects::Location& from_here,
UserShare* share, int64* transaction_version);
virtual ~WriteTransaction();
// Provide access to the syncable transaction from the API WriteNode.
virtual syncable::BaseTransaction* GetWrappedTrans() const OVERRIDE;
syncable::WriteTransaction* GetWrappedWriteTrans() { return transaction_; }
protected:
WriteTransaction() {}
void SetTransaction(syncable::WriteTransaction* trans) {
transaction_ = trans;
}
private:
void* operator new(size_t size); // Transaction is meant for stack use only.
// The underlying syncable object which this class wraps.
syncable::WriteTransaction* transaction_;
DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
};
} // namespace syncer
#endif // SYNC_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_
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