1 // Copyright (c) 2012 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 COMPONENTS_BROWSER_CONTEXT_KEYED_SERVICE_BROWSER_CONTEXT_KEYED_SERVICE_H_ 6 #define COMPONENTS_BROWSER_CONTEXT_KEYED_SERVICE_BROWSER_CONTEXT_KEYED_SERVICE_H_ 7 8 #include "components/browser_context_keyed_service/browser_context_keyed_service_export.h" 9 10 class BrowserContextKeyedServiceFactory; 11 12 // Base class for all BrowserContextKeyedServices to allow for correct 13 // destruction order. 14 // 15 // Many services that hang off BrowserContext have a two-pass shutdown. Many 16 // subsystems need a first pass shutdown phase where they drop references. Not 17 // all services will need this, so there's a default implementation. Only once 18 // every system has been given a chance to drop references do we start deleting 19 // objects. 20 class BROWSER_CONTEXT_KEYED_SERVICE_EXPORT BrowserContextKeyedService { 21 public: 22 // The first pass is to call Shutdown on a BrowserContextKeyedService. 23 virtual void Shutdown() {} 24 25 protected: 26 friend class BrowserContextKeyedServiceFactory; 27 28 // The second pass is the actual deletion of each object. 29 virtual ~BrowserContextKeyedService() {} 30 }; 31 32 #endif // COMPONENTS_BROWSER_CONTEXT_KEYED_SERVICE_BROWSER_CONTEXT_KEYED_SERVICE_H_ 33
