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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // See net/disk_cache/disk_cache.h for the public interface of the cache. | 5 // See net/disk_cache/disk_cache.h for the public interface of the cache. |
6 | 6 |
7 #ifndef NET_DISK_CACHE_BLOCKFILE_FILE_H_ | 7 #ifndef NET_DISK_CACHE_BLOCKFILE_FILE_H_ |
8 #define NET_DISK_CACHE_BLOCKFILE_FILE_H_ | 8 #define NET_DISK_CACHE_BLOCKFILE_FILE_H_ |
9 | 9 |
10 #include "base/files/file.h" | 10 #include "base/files/file.h" |
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24 // negative if an error occurred. | 24 // negative if an error occurred. |
25 virtual void OnFileIOComplete(int bytes_copied) = 0; | 25 virtual void OnFileIOComplete(int bytes_copied) = 0; |
26 | 26 |
27 protected: | 27 protected: |
28 virtual ~FileIOCallback() {} | 28 virtual ~FileIOCallback() {} |
29 }; | 29 }; |
30 | 30 |
31 // Simple wrapper around a file that allows asynchronous operations. | 31 // Simple wrapper around a file that allows asynchronous operations. |
32 class NET_EXPORT_PRIVATE File : public base::RefCounted<File> { | 32 class NET_EXPORT_PRIVATE File : public base::RefCounted<File> { |
33 friend class base::RefCounted<File>; | 33 friend class base::RefCounted<File>; |
| 34 |
34 public: | 35 public: |
35 File(); | 36 File(); |
36 // mixed_mode set to true enables regular synchronous operations for the file. | 37 // mixed_mode set to true enables regular synchronous operations for the file. |
37 explicit File(bool mixed_mode); | 38 explicit File(bool mixed_mode); |
38 | 39 |
39 // Initializes the object to use the passed in file instead of opening it with | 40 // Initializes the object to use the passed in file instead of opening it with |
40 // the Init() call. No asynchronous operations can be performed with this | 41 // the Init() call. No asynchronous operations can be performed with this |
41 // object. | 42 // object. |
42 explicit File(base::File file); | 43 explicit File(base::File file); |
43 | 44 |
44 // Initializes the object to point to a given file. The file must aready exist | 45 // Initializes the object to point to a given file. The file must aready exist |
45 // on disk, and allow shared read and write. | 46 // on disk, and allow shared read and write. |
46 bool Init(const base::FilePath& name); | 47 bool Init(const base::FilePath& name); |
47 | 48 |
48 // Returns true if the file was opened properly. | 49 // Returns true if the file was opened properly. |
49 bool IsValid() const; | 50 bool IsValid() const; |
50 | 51 |
51 // Performs synchronous IO. | 52 // Performs synchronous IO. |
52 bool Read(void* buffer, size_t buffer_len, size_t offset); | 53 bool Read(void* buffer, size_t buffer_len, size_t offset); |
53 bool Write(const void* buffer, size_t buffer_len, size_t offset); | 54 bool Write(const void* buffer, size_t buffer_len, size_t offset); |
54 | 55 |
55 // Performs asynchronous IO. callback will be called when the IO completes, | 56 // Performs asynchronous IO. callback will be called when the IO completes, |
56 // as an APC on the thread that queued the operation. | 57 // as an APC on the thread that queued the operation. |
57 bool Read(void* buffer, size_t buffer_len, size_t offset, | 58 bool Read(void* buffer, |
58 FileIOCallback* callback, bool* completed); | 59 size_t buffer_len, |
59 bool Write(const void* buffer, size_t buffer_len, size_t offset, | 60 size_t offset, |
60 FileIOCallback* callback, bool* completed); | 61 FileIOCallback* callback, |
| 62 bool* completed); |
| 63 bool Write(const void* buffer, |
| 64 size_t buffer_len, |
| 65 size_t offset, |
| 66 FileIOCallback* callback, |
| 67 bool* completed); |
61 | 68 |
62 // Sets the file's length. The file is truncated or extended with zeros to | 69 // Sets the file's length. The file is truncated or extended with zeros to |
63 // the new length. | 70 // the new length. |
64 bool SetLength(size_t length); | 71 bool SetLength(size_t length); |
65 size_t GetLength(); | 72 size_t GetLength(); |
66 | 73 |
67 // Blocks until |num_pending_io| IO operations complete. | 74 // Blocks until |num_pending_io| IO operations complete. |
68 static void WaitForPendingIO(int* num_pending_io); | 75 static void WaitForPendingIO(int* num_pending_io); |
69 | 76 |
70 // Drops current pending operations without waiting for them to complete. | 77 // Drops current pending operations without waiting for them to complete. |
71 static void DropPendingIO(); | 78 static void DropPendingIO(); |
72 | 79 |
73 protected: | 80 protected: |
74 virtual ~File(); | 81 virtual ~File(); |
75 | 82 |
76 // Returns the handle or file descriptor. | 83 // Returns the handle or file descriptor. |
77 base::PlatformFile platform_file() const; | 84 base::PlatformFile platform_file() const; |
78 | 85 |
79 private: | 86 private: |
80 // Performs the actual asynchronous write. If notify is set and there is no | 87 // Performs the actual asynchronous write. If notify is set and there is no |
81 // callback, the call will be re-synchronized. | 88 // callback, the call will be re-synchronized. |
82 bool AsyncWrite(const void* buffer, size_t buffer_len, size_t offset, | 89 bool AsyncWrite(const void* buffer, |
83 FileIOCallback* callback, bool* completed); | 90 size_t buffer_len, |
| 91 size_t offset, |
| 92 FileIOCallback* callback, |
| 93 bool* completed); |
84 | 94 |
85 // Infrastructure for async IO. | 95 // Infrastructure for async IO. |
86 int DoRead(void* buffer, size_t buffer_len, size_t offset); | 96 int DoRead(void* buffer, size_t buffer_len, size_t offset); |
87 int DoWrite(const void* buffer, size_t buffer_len, size_t offset); | 97 int DoWrite(const void* buffer, size_t buffer_len, size_t offset); |
88 void OnOperationComplete(FileIOCallback* callback, int result); | 98 void OnOperationComplete(FileIOCallback* callback, int result); |
89 | 99 |
90 bool init_; | 100 bool init_; |
91 bool mixed_; | 101 bool mixed_; |
92 base::File base_file_; // Regular, asynchronous IO handle. | 102 base::File base_file_; // Regular, asynchronous IO handle. |
93 base::File sync_base_file_; // Synchronous IO handle. | 103 base::File sync_base_file_; // Synchronous IO handle. |
94 | 104 |
95 DISALLOW_COPY_AND_ASSIGN(File); | 105 DISALLOW_COPY_AND_ASSIGN(File); |
96 }; | 106 }; |
97 | 107 |
98 } // namespace disk_cache | 108 } // namespace disk_cache |
99 | 109 |
100 #endif // NET_DISK_CACHE_BLOCKFILE_FILE_H_ | 110 #endif // NET_DISK_CACHE_BLOCKFILE_FILE_H_ |
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