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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 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 STORAGE_BROWSER_BLOB_SCOPED_FILE_H_ | 5 #ifndef STORAGE_BROWSER_BLOB_SCOPED_FILE_H_ |
6 #define STORAGE_BROWSER_BLOB_SCOPED_FILE_H_ | 6 #define STORAGE_BROWSER_BLOB_SCOPED_FILE_H_ |
7 | 7 |
8 #include <map> | 8 #include <map> |
9 | 9 |
10 #include "base/callback_forward.h" | 10 #include "base/callback_forward.h" |
11 #include "base/files/file_path.h" | 11 #include "base/files/file_path.h" |
12 #include "base/memory/ref_counted.h" | 12 #include "base/memory/ref_counted.h" |
13 #include "base/move.h" | 13 #include "base/move.h" |
14 #include "storage/browser/storage_browser_export.h" | 14 #include "storage/browser/storage_browser_export.h" |
15 | 15 |
16 namespace base { | 16 namespace base { |
17 class TaskRunner; | 17 class TaskRunner; |
18 } | 18 } |
19 | 19 |
20 namespace storage { | 20 namespace storage { |
21 | 21 |
22 // A scoped reference for a FilePath that can optionally schedule the file | 22 // A scoped reference for a FilePath that can optionally schedule the file |
23 // to be deleted and/or to notify a consumer when it is going to be scoped out. | 23 // to be deleted and/or to notify a consumer when it is going to be scoped out. |
24 // This class supports move semantics, i.e. consumers can call Pass() to | 24 // This class supports move semantics, i.e. consumers can call Pass() to |
25 // pass the ownership of ScopedFile. | 25 // pass the ownership of ScopedFile. |
26 // | 26 // |
27 // TODO(kinuko): Probably this can be moved under base or somewhere more | 27 // TODO(kinuko): Probably this can be moved under base or somewhere more |
28 // common place. | 28 // common place. |
29 class STORAGE_EXPORT ScopedFile { | 29 class STORAGE_EXPORT ScopedFile { |
30 // To support destructive assignment from an l-value assignment. | 30 MOVE_ONLY_TYPE_FOR_CPP_03(ScopedFile) |
31 // This provides Pass() method which creates an r-value for the current | |
32 // instance. (See base/move.h for details) | |
33 MOVE_ONLY_TYPE_FOR_CPP_03(ScopedFile, RValue) | |
34 | 31 |
35 public: | 32 public: |
36 typedef base::Callback<void(const base::FilePath&)> ScopeOutCallback; | 33 typedef base::Callback<void(const base::FilePath&)> ScopeOutCallback; |
37 typedef std::pair<ScopeOutCallback, scoped_refptr<base::TaskRunner> > | 34 typedef std::pair<ScopeOutCallback, scoped_refptr<base::TaskRunner> > |
38 ScopeOutCallbackPair; | 35 ScopeOutCallbackPair; |
39 typedef std::vector<ScopeOutCallbackPair> ScopeOutCallbackList; | 36 typedef std::vector<ScopeOutCallbackPair> ScopeOutCallbackList; |
40 | 37 |
41 enum ScopeOutPolicy { | 38 enum ScopeOutPolicy { |
42 DELETE_ON_SCOPE_OUT, | 39 DELETE_ON_SCOPE_OUT, |
43 DONT_DELETE_ON_SCOPE_OUT, | 40 DONT_DELETE_ON_SCOPE_OUT, |
44 }; | 41 }; |
45 | 42 |
46 ScopedFile(); | 43 ScopedFile(); |
47 | 44 |
48 // |file_task_runner| is used to schedule a file deletion if |policy| | 45 // |file_task_runner| is used to schedule a file deletion if |policy| |
49 // is DELETE_ON_SCOPE_OUT. | 46 // is DELETE_ON_SCOPE_OUT. |
50 ScopedFile(const base::FilePath& path, | 47 ScopedFile(const base::FilePath& path, |
51 ScopeOutPolicy policy, | 48 ScopeOutPolicy policy, |
52 const scoped_refptr<base::TaskRunner>& file_task_runner); | 49 const scoped_refptr<base::TaskRunner>& file_task_runner); |
53 | 50 |
54 // Move constructor and operator. The data of r-value will be transfered | 51 // Move constructor and operator. The data of r-value will be transfered |
55 // in a destructive way. (See base/move.h) | 52 // in a destructive way. (See base/move.h) |
56 ScopedFile(RValue other); | 53 ScopedFile(ScopedFile&& other); |
57 ScopedFile& operator=(RValue rhs) { | 54 ScopedFile& operator=(ScopedFile&& rhs) { |
58 MoveFrom(*rhs.object); | 55 MoveFrom(rhs); |
59 return *this; | 56 return *this; |
60 } | 57 } |
61 | 58 |
62 ~ScopedFile(); | 59 ~ScopedFile(); |
63 | 60 |
64 // The |callback| is fired on |callback_runner| when the final reference | 61 // The |callback| is fired on |callback_runner| when the final reference |
65 // of this instance is released. | 62 // of this instance is released. |
66 // If release policy is DELETE_ON_SCOPE_OUT the | 63 // If release policy is DELETE_ON_SCOPE_OUT the |
67 // callback task(s) is/are posted before the deletion is scheduled. | 64 // callback task(s) is/are posted before the deletion is scheduled. |
68 void AddScopeOutCallback(const ScopeOutCallback& callback, | 65 void AddScopeOutCallback(const ScopeOutCallback& callback, |
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85 | 82 |
86 base::FilePath path_; | 83 base::FilePath path_; |
87 ScopeOutPolicy scope_out_policy_; | 84 ScopeOutPolicy scope_out_policy_; |
88 scoped_refptr<base::TaskRunner> file_task_runner_; | 85 scoped_refptr<base::TaskRunner> file_task_runner_; |
89 ScopeOutCallbackList scope_out_callbacks_; | 86 ScopeOutCallbackList scope_out_callbacks_; |
90 }; | 87 }; |
91 | 88 |
92 } // namespace storage | 89 } // namespace storage |
93 | 90 |
94 #endif // STORAGE_BROWSER_BLOB_SCOPED_FILE_H_ | 91 #endif // STORAGE_BROWSER_BLOB_SCOPED_FILE_H_ |
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