| // 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/syncable/base_transaction.h" |
| |
| namespace base { |
| class Location; |
| } // namespace base |
| |
| 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 base::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; |
| |
| // 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_ |