Adding Baseframework of the ResourceManager (all hooks and observers) are being put in place with a…

athena/activity/activity_manager_impl.cc

 // Copyright 2014 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.
 
 #include "athena/activity/public/activity_manager.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "athena/activity/public/activity.h"
+#include "athena/activity/public/activity_manager_observer.h"
 #include "athena/activity/public/activity_view_manager.h"
 #include "base/logging.h"
+#include "base/observer_list.h"
 
 namespace athena {
 
+class ActivityManagerObserver;
+
 namespace {
 
 ActivityManager* instance = NULL;
 
 class ActivityManagerImpl : public ActivityManager {
  public:
   ActivityManagerImpl() {
     CHECK(!instance);
     instance = this;
   }
   virtual ~ActivityManagerImpl() {
     while (!activities_.empty())
       delete activities_.front();
 
     CHECK_EQ(this, instance);
     instance = NULL;
   }
 
   // ActivityManager:
   virtual void AddActivity(Activity* activity) OVERRIDE {
     CHECK(activities_.end() == std::find(activities_.begin(),
                                          activities_.end(),
                                          activity));
     activities_.push_back(activity);
     ActivityViewManager* manager = ActivityViewManager::Get();
     manager->AddActivity(activity);
+    FOR_EACH_OBSERVER(ActivityManagerObserver,
+                      observers_,
+                      OnActivityStarted(activity));
   }
 
   virtual void RemoveActivity(Activity* activity) OVERRIDE {
     std::vector<Activity*>::iterator find = std::find(activities_.begin(),
                                                       activities_.end(),
                                                       activity);
+    FOR_EACH_OBSERVER(ActivityManagerObserver,
+                      observers_,
+                      OnActivityEnding(activity));
     if (find != activities_.end()) {
       activities_.erase(find);
 
       ActivityViewManager* manager = ActivityViewManager::Get();
       manager->RemoveActivity(activity);
     }
   }
 
   virtual void UpdateActivity(Activity* activity) OVERRIDE {
     ActivityViewManager* manager = ActivityViewManager::Get();
     manager->UpdateActivity(activity);
   }
 
+  virtual void AddObserver(ActivityManagerObserver* observer) OVERRIDE {
+    observers_.AddObserver(observer);
+  }
+
+  virtual void RemoveObserver(ActivityManagerObserver* observer) OVERRIDE {
+    observers_.RemoveObserver(observer);
+  }
+
  private:
   std::vector<Activity*> activities_;
+  ObserverList<ActivityManagerObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ActivityManagerImpl);
 };
 
 }  // namespace
 
 // static
 ActivityManager* ActivityManager::Create() {
   ActivityViewManager::Create();
 
   new ActivityManagerImpl();
   CHECK(instance);
   return instance;
 }
 
 ActivityManager* ActivityManager::Get() {
   return instance;
 }
 
 void ActivityManager::Shutdown() {
   CHECK(instance);
   delete instance;
   ActivityViewManager::Shutdown();
 }
 
 }  // namespace athena