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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_ | 5 #include "storage/browser/fileapi/file_system_usage_cache.h" |
6 #define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_ | |
7 | |
8 #include <map> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "base/files/file.h" | |
12 #include "base/files/file_path.h" | |
13 #include "base/memory/scoped_ptr.h" | |
14 #include "base/memory/weak_ptr.h" | |
15 #include "base/sequenced_task_runner.h" | |
16 #include "webkit/browser/storage_browser_export.h" | |
17 | |
18 namespace storage { | |
19 | |
20 class TimedTaskHelper; | |
21 | |
22 class STORAGE_EXPORT_PRIVATE FileSystemUsageCache { | |
23 public: | |
24 explicit FileSystemUsageCache(base::SequencedTaskRunner* task_runner); | |
25 ~FileSystemUsageCache(); | |
26 | |
27 // Gets the size described in the .usage file even if dirty > 0 or | |
28 // is_valid == false. Returns true if the .usage file is available. | |
29 bool GetUsage(const base::FilePath& usage_file_path, int64* usage); | |
30 | |
31 // Gets the dirty count in the .usage file. | |
32 // Returns true if the .usage file is available. | |
33 bool GetDirty(const base::FilePath& usage_file_path, uint32* dirty); | |
34 | |
35 // Increments or decrements the "dirty" entry in the .usage file. | |
36 // Returns false if no .usage is available. | |
37 bool IncrementDirty(const base::FilePath& usage_file_path); | |
38 bool DecrementDirty(const base::FilePath& usage_file_path); | |
39 | |
40 // Notifies quota system that it needs to recalculate the usage cache of the | |
41 // origin. Returns false if no .usage is available. | |
42 bool Invalidate(const base::FilePath& usage_file_path); | |
43 bool IsValid(const base::FilePath& usage_file_path); | |
44 | |
45 // Updates the size described in the .usage file. | |
46 bool UpdateUsage(const base::FilePath& usage_file_path, int64 fs_usage); | |
47 | |
48 // Updates the size described in the .usage file by delta with keeping dirty | |
49 // even if dirty > 0. | |
50 bool AtomicUpdateUsageByDelta(const base::FilePath& usage_file_path, | |
51 int64 delta); | |
52 | |
53 bool Exists(const base::FilePath& usage_file_path); | |
54 bool Delete(const base::FilePath& usage_file_path); | |
55 | |
56 void CloseCacheFiles(); | |
57 | |
58 static const base::FilePath::CharType kUsageFileName[]; | |
59 static const char kUsageFileHeader[]; | |
60 static const int kUsageFileSize; | |
61 static const int kUsageFileHeaderSize; | |
62 | |
63 private: | |
64 typedef std::map<base::FilePath, base::File*> CacheFiles; | |
65 | |
66 // Read the size, validity and the "dirty" entry described in the .usage file. | |
67 // Returns less than zero if no .usage file is available. | |
68 bool Read(const base::FilePath& usage_file_path, | |
69 bool* is_valid, | |
70 uint32* dirty, | |
71 int64* usage); | |
72 | |
73 bool Write(const base::FilePath& usage_file_path, | |
74 bool is_valid, | |
75 int32 dirty, | |
76 int64 fs_usage); | |
77 | |
78 base::File* GetFile(const base::FilePath& file_path); | |
79 | |
80 bool ReadBytes(const base::FilePath& file_path, | |
81 char* buffer, | |
82 int64 buffer_size); | |
83 bool WriteBytes(const base::FilePath& file_path, | |
84 const char* buffer, | |
85 int64 buffer_size); | |
86 bool FlushFile(const base::FilePath& file_path); | |
87 void ScheduleCloseTimer(); | |
88 | |
89 bool HasCacheFileHandle(const base::FilePath& file_path); | |
90 | |
91 bool CalledOnValidThread(); | |
92 | |
93 scoped_ptr<TimedTaskHelper> timer_; | |
94 CacheFiles cache_files_; | |
95 | |
96 scoped_refptr<base::SequencedTaskRunner> task_runner_; | |
97 | |
98 base::WeakPtrFactory<FileSystemUsageCache> weak_factory_; | |
99 | |
100 DISALLOW_COPY_AND_ASSIGN(FileSystemUsageCache); | |
101 }; | |
102 | |
103 } // namespace storage | |
104 | |
105 #endif // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_ | |
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