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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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