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Side by Side Diff: chrome/browser/extensions/external_extension_loader.h

Issue 7259019: Move base/values.h into the base namespace. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 9 years, 5 months ago
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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
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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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