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/browser/uninstall_reason.h" 9 #include "extensions/common/extension.h" 10 11 namespace content { 12 class BrowserContext; 13 } 14 15 namespace extensions { 16 17 class Extension; 18 class ExtensionRegistry; 19 struct UnloadedExtensionInfo; 20 21 // Observer for ExtensionRegistry. Exists in a separate header file to reduce 22 // the include file burden for typical clients of ExtensionRegistry. 23 class ExtensionRegistryObserver { 24 public: 25 virtual ~ExtensionRegistryObserver() {} 26 27 // Called after an extension is loaded. The extension will exclusively exist 28 // in the enabled_extensions set of ExtensionRegistry. 29 virtual void OnExtensionLoaded( 30 content::BrowserContext* browser_context, 31 const Extension* extension) {} 32 33 // Called after an extension is unloaded. The extension no longer exists in 34 // any of the ExtensionRegistry sets (enabled, disabled, etc.). 35 virtual void OnExtensionUnloaded(content::BrowserContext* browser_context, 36 const Extension* extension, 37 UnloadedExtensionInfo::Reason reason) {} 38 39 // Called when |extension| is about to be installed. |is_update| is true if 40 // the installation is the result of it updating, in which case |old_name| is 41 // the name of the extension's previous version. 42 // If true, |from_ephemeral| indicates that the extension was previously 43 // installed ephemerally and has been promoted to a regular installed 44 // extension. |is_update| will be true, although the version has not 45 // necessarily changed. 46 // The ExtensionRegistry will not be tracking |extension| at the time this 47 // event is fired, but will be immediately afterwards (note: not necessarily 48 // enabled; it might be installed in the disabled or even blacklisted sets, 49 // for example). 50 // Note that it's much more common to care about extensions being loaded 51 // (OnExtensionLoaded). 52 // 53 // TODO(tmdiep): We should stash the state of the previous extension version 54 // somewhere and have observers retrieve it. |is_update|, |from_ephemeral| 55 // and |old_name| can be removed when this is done. 56 virtual void OnExtensionWillBeInstalled( 57 content::BrowserContext* browser_context, 58 const Extension* extension, 59 bool is_update, 60 bool from_ephemeral, 61 const std::string& old_name) {} 62 63 // Called when the installation of |extension| is complete. At this point the 64 // extension is tracked in one of the ExtensionRegistry sets, but is not 65 // necessarily enabled. 66 virtual void OnExtensionInstalled(content::BrowserContext* browser_context, 67 const Extension* extension, 68 bool is_update) {} 69 70 // Called after an extension is uninstalled. The extension no longer exists in 71 // any of the ExtensionRegistry sets (enabled, disabled, etc.). 72 virtual void OnExtensionUninstalled(content::BrowserContext* browser_context, 73 const Extension* extension, 74 UninstallReason reason) {} 75 76 // Notifies observers that the observed object is going away. 77 virtual void OnShutdown(ExtensionRegistry* registry) {} 78 }; 79 80 } // namespace extensions 81 82 #endif // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_OBSERVER_H_ 83
