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1 // Copyright 2013 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_QUOTA_OPEN_FILE_HANDLE_H_ | 5 #include "storage/browser/fileapi/quota/open_file_handle.h" |
6 #define WEBKIT_BROWSER_FILEAPI_QUOTA_OPEN_FILE_HANDLE_H_ | |
7 | |
8 #include "base/basictypes.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "base/memory/weak_ptr.h" | |
11 #include "webkit/browser/storage_browser_export.h" | |
12 | |
13 namespace base { | |
14 class FilePath; | |
15 } | |
16 | |
17 namespace storage { | |
18 | |
19 class QuotaReservation; | |
20 class OpenFileHandleContext; | |
21 class QuotaReservationBuffer; | |
22 | |
23 // Represents an open file like a file descriptor. | |
24 // This should be alive while a consumer keeps a file opened and should be | |
25 // deleted when the plugin closes the file. | |
26 class STORAGE_EXPORT OpenFileHandle { | |
27 public: | |
28 ~OpenFileHandle(); | |
29 | |
30 // Updates cached file size and consumes quota for that. | |
31 // Both this and AddAppendModeWriteAmount should be called for each modified | |
32 // file before calling QuotaReservation::RefreshQuota and before closing the | |
33 // file. | |
34 void UpdateMaxWrittenOffset(int64 offset); | |
35 | |
36 // Notifies that |amount| of data is written to the file in append mode, and | |
37 // consumes quota for that. | |
38 // Both this and UpdateMaxWrittenOffset should be called for each modified | |
39 // file before calling QuotaReservation::RefreshQuota and before closing the | |
40 // file. | |
41 void AddAppendModeWriteAmount(int64 amount); | |
42 | |
43 // Returns the estimated file size for the quota consumption calculation. | |
44 // The client must consume its reserved quota when it writes data to the file | |
45 // beyond the estimated file size. | |
46 // The estimated file size is greater than or equal to actual file size after | |
47 // all clients report their file usage, and is monotonically increasing over | |
48 // OpenFileHandle object life cycle, so that client may cache the value. | |
49 int64 GetEstimatedFileSize() const; | |
50 | |
51 int64 GetMaxWrittenOffset() const; | |
52 const base::FilePath& platform_path() const; | |
53 | |
54 private: | |
55 friend class QuotaReservationBuffer; | |
56 | |
57 OpenFileHandle(QuotaReservation* reservation, | |
58 OpenFileHandleContext* context); | |
59 | |
60 scoped_refptr<QuotaReservation> reservation_; | |
61 scoped_refptr<OpenFileHandleContext> context_; | |
62 | |
63 base::SequenceChecker sequence_checker_; | |
64 | |
65 DISALLOW_COPY_AND_ASSIGN(OpenFileHandle); | |
66 }; | |
67 | |
68 } // namespace storage | |
69 | |
70 #endif // WEBKIT_BROWSER_FILEAPI_QUOTA_OPEN_FILE_HANDLE_H_ | |
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