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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 SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_ | |
6 #define SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_ | |
7 | |
8 #include <stdint.h> | |
9 | |
10 #include <vector> | |
11 | |
12 #include "base/macros.h" | |
13 #include "sync/base/sync_export.h" | |
14 #include "sync/syncable/entry_kernel.h" | |
15 #include "sync/syncable/syncable_base_write_transaction.h" | |
16 | |
17 namespace syncer { | |
18 namespace syncable { | |
19 | |
20 SYNC_EXPORT extern const int64_t kInvalidTransactionVersion; | |
21 | |
22 // Locks db in constructor, unlocks in destructor. | |
23 class SYNC_EXPORT WriteTransaction : public BaseWriteTransaction { | |
24 public: | |
25 WriteTransaction(const tracked_objects::Location& from_here, | |
26 WriterTag writer, Directory* directory); | |
27 | |
28 // Constructor used for getting back transaction version after making sync | |
29 // API changes to one model. If model is changed by the transaction, | |
30 // the new transaction version of the model and modified nodes will be saved | |
31 // in |transaction_version| upon destruction of the transaction. If model is | |
32 // not changed, |transaction_version| will be kInvalidTransactionVersion. | |
33 WriteTransaction(const tracked_objects::Location& from_here, | |
34 Directory* directory, | |
35 int64_t* transaction_version); | |
36 | |
37 ~WriteTransaction() override; | |
38 | |
39 void TrackChangesTo(const EntryKernel* entry) override; | |
40 | |
41 protected: | |
42 // Overridden by tests. | |
43 virtual void NotifyTransactionComplete(ModelTypeSet models_with_changes); | |
44 | |
45 private: | |
46 friend class MutableEntry; | |
47 | |
48 // Clears |mutations_|. | |
49 ImmutableEntryKernelMutationMap RecordMutations(); | |
50 | |
51 void UnlockAndNotify(const ImmutableEntryKernelMutationMap& mutations); | |
52 | |
53 ModelTypeSet NotifyTransactionChangingAndEnding( | |
54 const ImmutableEntryKernelMutationMap& mutations); | |
55 | |
56 // Increment versions of the models whose entries are modified and set the | |
57 // version on the changed entries. | |
58 void UpdateTransactionVersion(const std::vector<int64_t>& entry_changed); | |
59 | |
60 // Only the original fields are filled in until |RecordMutations()|. | |
61 // We use a mutation map instead of a kernel set to avoid copying. | |
62 EntryKernelMutationMap mutations_; | |
63 | |
64 // Stores new transaction version of changed model and nodes if model is | |
65 // indeed changed. kInvalidTransactionVersion otherwise. Not owned. | |
66 int64_t* transaction_version_; | |
67 | |
68 DISALLOW_COPY_AND_ASSIGN(WriteTransaction); | |
69 }; | |
70 | |
71 } // namespace syncable | |
72 } // namespace syncer | |
73 | |
74 #endif // SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_ | |
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