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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_ | 5 #ifndef CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_ |
| 6 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_ | 6 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_ |
| 7 #pragma once | 7 #pragma once |
| 8 | 8 |
| 9 #include "base/file_path.h" | 9 #include "base/file_path.h" |
| 10 #include "base/memory/ref_counted.h" | 10 #include "base/memory/ref_counted.h" |
| 11 #include "base/memory/scoped_ptr.h" | 11 #include "base/memory/scoped_ptr.h" |
| 12 | 12 |
| 13 class ExternalExtensionProviderImpl; |
| 14 |
| 15 namespace base { |
| 13 class DictionaryValue; | 16 class DictionaryValue; |
| 14 class ExternalExtensionProviderImpl; | 17 } |
| 15 | 18 |
| 16 // Base class for gathering a list of external extensions. Subclasses | 19 // Base class for gathering a list of external extensions. Subclasses |
| 17 // implement loading from registry, JSON file, policy. | 20 // implement loading from registry, JSON file, policy. |
| 18 // Instances are owned by ExternalExtensionProviderImpl objects. | 21 // Instances are owned by ExternalExtensionProviderImpl objects. |
| 19 // Instances are created on the UI thread and expect public method calls from | 22 // Instances are created on the UI thread and expect public method calls from |
| 20 // the UI thread. Some subclasses introduce new methods that are executed on the | 23 // the UI thread. Some subclasses introduce new methods that are executed on the |
| 21 // FILE thread. | 24 // FILE thread. |
| 22 // The sequence of loading the extension list: | 25 // The sequence of loading the extension list: |
| 23 // 1.) StartLoading() - checks if a loading task is already running | 26 // 1.) StartLoading() - checks if a loading task is already running |
| 24 // 2.) Load() - implemented in subclasses | 27 // 2.) Load() - implemented in subclasses |
| (...skipping 30 matching lines...) Expand all Loading... |
| 55 // Notifies the provider that the list of extensions has been loaded. | 58 // Notifies the provider that the list of extensions has been loaded. |
| 56 void LoadFinished(); | 59 void LoadFinished(); |
| 57 | 60 |
| 58 // Used for passing the list of extensions from the method that loads them | 61 // Used for passing the list of extensions from the method that loads them |
| 59 // to |LoadFinished|. To ensure thread safety, the rules are the following: | 62 // to |LoadFinished|. To ensure thread safety, the rules are the following: |
| 60 // if this value is written on another thread than the UI, then it should | 63 // if this value is written on another thread than the UI, then it should |
| 61 // only be written in a task that was posted from |StartLoading|. After that, | 64 // only be written in a task that was posted from |StartLoading|. After that, |
| 62 // this task should invoke |LoadFinished| with a PostTask. This scheme of | 65 // this task should invoke |LoadFinished| with a PostTask. This scheme of |
| 63 // posting tasks will avoid concurrent access and imply the necessary memory | 66 // posting tasks will avoid concurrent access and imply the necessary memory |
| 64 // barriers. | 67 // barriers. |
| 65 scoped_ptr<DictionaryValue> prefs_; | 68 scoped_ptr<base::DictionaryValue> prefs_; |
| 66 | 69 |
| 67 private: | 70 private: |
| 68 friend class base::RefCountedThreadSafe<ExternalExtensionLoader>; | 71 friend class base::RefCountedThreadSafe<ExternalExtensionLoader>; |
| 69 | 72 |
| 70 ExternalExtensionProviderImpl* owner_; // weak | 73 ExternalExtensionProviderImpl* owner_; // weak |
| 71 | 74 |
| 72 // Set to true if loading the extensions is already running. New requests | 75 // Set to true if loading the extensions is already running. New requests |
| 73 // are ignored while this is set true. | 76 // are ignored while this is set true. |
| 74 bool running_; | 77 bool running_; |
| 75 | 78 |
| 76 DISALLOW_COPY_AND_ASSIGN(ExternalExtensionLoader); | 79 DISALLOW_COPY_AND_ASSIGN(ExternalExtensionLoader); |
| 77 }; | 80 }; |
| 78 | 81 |
| 79 #endif // CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_ | 82 #endif // CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_ |
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