1 // Copyright 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef SYNC_INTERNAL_API_PUBLIC_READ_TRANSACTION_H_ 6 #define SYNC_INTERNAL_API_PUBLIC_READ_TRANSACTION_H_ 7 8 #include "base/compiler_specific.h" 9 #include "sync/base/sync_export.h" 10 #include "sync/internal_api/public/base_transaction.h" 11 12 namespace tracked_objects { 13 class Location; 14 } // namespace tracked_objects 15 16 namespace syncer { 17 18 struct UserShare; 19 20 // Sync API's ReadTransaction is a read-only BaseTransaction. It wraps 21 // a syncable::ReadTransaction. 22 class SYNC_EXPORT ReadTransaction : public BaseTransaction { 23 public: 24 // Start a new read-only transaction on the specified repository. 25 ReadTransaction(const tracked_objects::Location& from_here, 26 UserShare* share); 27 28 // Resume the middle of a transaction. Will not close transaction. 29 ReadTransaction(UserShare* share, syncable::BaseTransaction* trans); 30 31 virtual ~ReadTransaction(); 32 33 // BaseTransaction override. 34 virtual syncable::BaseTransaction* GetWrappedTrans() const OVERRIDE; 35 36 // Return |transaction_version| of |type| stored in sync directory's 37 // persisted info. 38 int64 GetModelVersion(ModelType type); 39 40 private: 41 void* operator new(size_t size); // Transaction is meant for stack use only. 42 43 // The underlying syncable object which this class wraps. 44 syncable::BaseTransaction* transaction_; 45 bool close_transaction_; 46 47 DISALLOW_COPY_AND_ASSIGN(ReadTransaction); 48 }; 49 50 } // namespace syncer 51 52 #endif // SYNC_INTERNAL_API_PUBLIC_READ_TRANSACTION_H_ 53
