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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CHROME_COMMON_IMPORTANT_FILE_WRITER_H_ | 5 #ifndef CHROME_COMMON_IMPORTANT_FILE_WRITER_H_ |
6 #define CHROME_COMMON_IMPORTANT_FILE_WRITER_H_ | 6 #define CHROME_COMMON_IMPORTANT_FILE_WRITER_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <string> | 9 #include <string> |
10 | 10 |
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35 // temporary file to target filename. | 35 // temporary file to target filename. |
36 // | 36 // |
37 // If you want to know more about this approach and ext3/ext4 fsync issues, see | 37 // If you want to know more about this approach and ext3/ext4 fsync issues, see |
38 // http://valhenson.livejournal.com/37921.html | 38 // http://valhenson.livejournal.com/37921.html |
39 class ImportantFileWriter : public base::NonThreadSafe { | 39 class ImportantFileWriter : public base::NonThreadSafe { |
40 public: | 40 public: |
41 // Used by ScheduleSave to lazily provide the data to be saved. Allows us | 41 // Used by ScheduleSave to lazily provide the data to be saved. Allows us |
42 // to also batch data serializations. | 42 // to also batch data serializations. |
43 class DataSerializer { | 43 class DataSerializer { |
44 public: | 44 public: |
45 virtual ~DataSerializer() {} | |
46 | |
47 // Should put serialized string in |data| and return true on successful | 45 // Should put serialized string in |data| and return true on successful |
48 // serialization. Will be called on the same thread on which | 46 // serialization. Will be called on the same thread on which |
49 // ImportantFileWriter has been created. | 47 // ImportantFileWriter has been created. |
50 virtual bool SerializeData(std::string* data) = 0; | 48 virtual bool SerializeData(std::string* data) = 0; |
| 49 |
| 50 protected: |
| 51 virtual ~DataSerializer() {} |
51 }; | 52 }; |
52 | 53 |
53 // Initialize the writer. | 54 // Initialize the writer. |
54 // |path| is the name of file to write. | 55 // |path| is the name of file to write. |
55 // |file_message_loop_proxy| is the MessageLoopProxy for a thread on which | 56 // |file_message_loop_proxy| is the MessageLoopProxy for a thread on which |
56 // file I/O can be done. | 57 // file I/O can be done. |
57 // All non-const methods, ctor and dtor must be called on the same thread. | 58 // All non-const methods, ctor and dtor must be called on the same thread. |
58 ImportantFileWriter(const FilePath& path, | 59 ImportantFileWriter(const FilePath& path, |
59 base::MessageLoopProxy* file_message_loop_proxy); | 60 base::MessageLoopProxy* file_message_loop_proxy); |
60 | 61 |
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104 // Serializer which will provide the data to be saved. | 105 // Serializer which will provide the data to be saved. |
105 DataSerializer* serializer_; | 106 DataSerializer* serializer_; |
106 | 107 |
107 // Time delta after which scheduled data will be written to disk. | 108 // Time delta after which scheduled data will be written to disk. |
108 base::TimeDelta commit_interval_; | 109 base::TimeDelta commit_interval_; |
109 | 110 |
110 DISALLOW_COPY_AND_ASSIGN(ImportantFileWriter); | 111 DISALLOW_COPY_AND_ASSIGN(ImportantFileWriter); |
111 }; | 112 }; |
112 | 113 |
113 #endif // CHROME_COMMON_IMPORTANT_FILE_WRITER_H_ | 114 #endif // CHROME_COMMON_IMPORTANT_FILE_WRITER_H_ |
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