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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 COMPONENTS_SYNC_CORE_BASE_TRANSACTION_H_ | |
6 #define COMPONENTS_SYNC_CORE_BASE_TRANSACTION_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "components/sync/base/cryptographer.h" | |
10 #include "components/sync/base/model_type.h" | |
11 #include "components/sync/core/user_share.h" | |
12 | |
13 namespace syncer { | |
14 | |
15 namespace syncable { | |
16 class BaseTransaction; | |
17 class Directory; | |
18 } | |
19 | |
20 // Sync API's BaseTransaction, ReadTransaction, and WriteTransaction allow for | |
21 // batching of several read and/or write operations. The read and write | |
22 // operations are performed by creating ReadNode and WriteNode instances using | |
23 // the transaction. These transaction classes wrap identically named classes in | |
24 // syncable, and are used in a similar way. Unlike syncable::BaseTransaction, | |
25 // whose construction requires an explicit syncable::Directory, a sync | |
26 // API BaseTransaction is created from a UserShare object. | |
27 // | |
28 // Note, these transactions are not atomic. Individual operations can | |
29 // fail. There is no built-in rollback or undo mechanism. | |
30 class BaseTransaction { | |
31 public: | |
32 // Provide access to the underlying syncable objects from BaseNode. | |
33 virtual syncable::BaseTransaction* GetWrappedTrans() const = 0; | |
34 Cryptographer* GetCryptographer() const; | |
35 ModelTypeSet GetEncryptedTypes() const; | |
36 | |
37 syncable::Directory* GetDirectory() const { | |
38 if (!user_share_) { | |
39 return NULL; | |
40 } else { | |
41 return user_share_->directory.get(); | |
42 } | |
43 } | |
44 | |
45 UserShare* GetUserShare() const { return user_share_; } | |
46 | |
47 protected: | |
48 explicit BaseTransaction(UserShare* share); | |
49 virtual ~BaseTransaction(); | |
50 | |
51 BaseTransaction() : user_share_(NULL) {} | |
52 | |
53 private: | |
54 UserShare* user_share_; | |
55 | |
56 DISALLOW_COPY_AND_ASSIGN(BaseTransaction); | |
57 }; | |
58 | |
59 } // namespace syncer | |
60 | |
61 #endif // COMPONENTS_SYNC_CORE_BASE_TRANSACTION_H_ | |
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