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      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
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_PROFILES_PROFILE_DEPENDENCY_MANAGER_H_
      6 #define CHROME_BROWSER_PROFILES_PROFILE_DEPENDENCY_MANAGER_H_
      7 
      8 #include <map>
      9 #include <vector>
     10 
     11 #include "base/memory/singleton.h"
     12 
     13 class Profile;
     14 class ProfileKeyedServiceFactory;
     15 
     16 // A singleton that listens for profile destruction notifications and
     17 // rebroadcasts them to each ProfileKeyedServiceFactory in a safe order based
     18 // on the stated dependencies by each service.
     19 class ProfileDependencyManager {
     20  public:
     21   // Adds/Removes a component from our list of live components. Removing will
     22   // also remove live dependency links.
     23   void AddComponent(ProfileKeyedServiceFactory* component);
     24   void RemoveComponent(ProfileKeyedServiceFactory* component);
     25 
     26   // Adds a dependency between two factories.
     27   void AddEdge(ProfileKeyedServiceFactory* depended,
     28                ProfileKeyedServiceFactory* dependee);
     29 
     30   // Called by each Profile to alert us that we should destroy services
     31   // associated with it.
     32   //
     33   // Why not use the existing PROFILE_DESTROYED notification?
     34   //
     35   // - Because we need to do everything here after the application has handled
     36   //   being notified about PROFILE_DESTROYED.
     37   // - Because this class is a singleton and Singletons can't rely on
     38   //   NotificationService in unit tests because NotificationService is
     39   //   replaced in many tests.
     40   void DestroyProfileServices(Profile* profile);
     41 
     42   static ProfileDependencyManager* GetInstance();
     43 
     44  private:
     45   friend class ProfileDependencyManagerUnittests;
     46   friend struct DefaultSingletonTraits<ProfileDependencyManager>;
     47 
     48   typedef std::multimap<ProfileKeyedServiceFactory*,
     49                         ProfileKeyedServiceFactory*> EdgeMap;
     50 
     51   ProfileDependencyManager();
     52   virtual ~ProfileDependencyManager();
     53 
     54   // Using the dependency graph defined in |edges_|, fills |destruction_order_|
     55   // so that Observe() can notify each ProfileKeyedServiceFactory in order.
     56   void BuildDestructionOrder();
     57 
     58   std::vector<ProfileKeyedServiceFactory*> all_components_;
     59 
     60   EdgeMap edges_;
     61 
     62   std::vector<ProfileKeyedServiceFactory*> destruction_order_;
     63 };
     64 
     65 #endif  // CHROME_BROWSER_PROFILES_PROFILE_DEPENDENCY_MANAGER_H_
     66