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 3 // found in the LICENSE file. 4 5 #ifndef EXTENSIONS_BROWSER_EXTENSION_REGISTRY_OBSERVER_H_ 6 #define EXTENSIONS_BROWSER_EXTENSION_REGISTRY_OBSERVER_H_ 7 8 #include "extensions/common/extension.h" 9 10 namespace content { 11 class BrowserContext; 12 } 13 14 namespace extensions { 15 16 class Extension; 17 class ExtensionRegistry; 18 struct UnloadedExtensionInfo; 19 20 // Observer for ExtensionRegistry. Exists in a separate header file to reduce 21 // the include file burden for typical clients of ExtensionRegistry. 22 class ExtensionRegistryObserver { 23 public: 24 virtual ~ExtensionRegistryObserver() {} 25 26 // Called after an extension is loaded. The extension will exclusively exist 27 // in the enabled_extensions set of ExtensionRegistry. 28 virtual void OnExtensionLoaded( 29 content::BrowserContext* browser_context, 30 const Extension* extension) {} 31 32 // Called after an extension is unloaded. The extension no longer exists in 33 // any of the ExtensionRegistry sets (enabled, disabled, etc.). 34 virtual void OnExtensionUnloaded(content::BrowserContext* browser_context, 35 const Extension* extension, 36 UnloadedExtensionInfo::Reason reason) {} 37 38 // Called when |extension| is about to be installed. |is_update| is true if 39 // the installation is the result of it updating, in which case |old_name| is 40 // the name of the extension's previous version. 41 // If true, |from_ephemeral| indicates that the extension was previously 42 // installed ephemerally and has been promoted to a regular installed 43 // extension. |is_update| will be true, although the version has not 44 // necessarily changed. 45 // The ExtensionRegistry will not be tracking |extension| at the time this 46 // event is fired, but will be immediately afterwards (note: not necessarily 47 // enabled; it might be installed in the disabled or even blacklisted sets, 48 // for example). 49 // Note that it's much more common to care about extensions being loaded 50 // (OnExtensionLoaded). 51 // 52 // TODO(tmdiep): We should stash the state of the previous extension version 53 // somewhere and have observers retrieve it. |is_update|, |from_ephemeral| 54 // and |old_name| can be removed when this is done. 55 virtual void OnExtensionWillBeInstalled( 56 content::BrowserContext* browser_context, 57 const Extension* extension, 58 bool is_update, 59 bool from_ephemeral, 60 const std::string& old_name) {} 61 62 // Called when the installation of |extension| is complete. At this point the 63 // extension is tracked in one of the ExtensionRegistry sets, but is not 64 // necessarily enabled. 65 virtual void OnExtensionInstalled(content::BrowserContext* browser_context, 66 const Extension* extension) {} 67 68 // Called after an extension is uninstalled. The extension no longer exists in 69 // any of the ExtensionRegistry sets (enabled, disabled, etc.). 70 virtual void OnExtensionUninstalled(content::BrowserContext* browser_context, 71 const Extension* extension) {} 72 73 // Notifies observers that the observed object is going away. 74 virtual void OnShutdown(ExtensionRegistry* registry) {} 75 }; 76 77 } // namespace extensions 78 79 #endif // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_OBSERVER_H_ 80
