[GRC] Coordination Unit Graph Observer

services/resource_coordinator/coordination_unit/coordination_unit_manager.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_MANAGER_H_
 #define SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_MANAGER_H_
 
+#include <vector>
+
 #include "base/macros.h"
 
 namespace service_manager {
 class BinderRegistry;
 class ServiceContextRefFactory;
 }  // service_manager
 
 namespace resource_coordinator {
 
+class CoordinationUnitImpl;
+class CoordinationUnitGraphObserver;
+
 // The CoordinationUnitManager is a singleton that encapsulates all
 // aspects of Coordination Units within the ResourceCoordinatorService.
 // All functionality for dealing with CoordinationUnits should be contained
 // within this class or classes that are owned by it
 class CoordinationUnitManager {
  public:
   CoordinationUnitManager();
   ~CoordinationUnitManager();
 
   void OnStart(service_manager::BinderRegistry* registry,
                service_manager::ServiceContextRefFactory* service_ref_factory);
+  void RegisterObserver(CoordinationUnitGraphObserver* observers);
+
+  void NotifyObserversCoordinationUnitCreated(
+      CoordinationUnitImpl* coordination_unit);
+  void NotifyObserversCoordinationUnitWillBeDestroyed(
+      CoordinationUnitImpl* coordination_unit);
+
+  // Allow tests to clear all observers so that they can isolate specific
+  // observers without having to worry about side effects from others.
+  void UnregisterAllObserversForTesting();
 
  private:
+  std::vector<CoordinationUnitGraphObserver*> observers_;

[Zhen Wang, 2017/06/15 20:07:53]

Use smart pointer instead of raw pointers:
https://www.chromium.org/developers/smart-pointer-guidelines

+
   static void Create(
       service_manager::ServiceContextRefFactory* service_ref_factory);
 
   DISALLOW_COPY_AND_ASSIGN(CoordinationUnitManager);
 };
 
 }  // namespace resource_coordinator
 
 #endif  // SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_MANAGER_H_