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/activity_manager_impl.h"
 
 #include <algorithm>
 
 #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 {
 
 namespace {
 
 ActivityManager* instance = NULL;
 
 }  // namespace
 
 ActivityManagerImpl::ActivityManagerImpl() {
   CHECK(!instance);
   instance = this;
 }
 
 ActivityManagerImpl::~ActivityManagerImpl() {
   while (!activities_.empty())
     delete activities_.front();
 
   CHECK_EQ(this, instance);
   instance = NULL;
 }
 
 void ActivityManagerImpl::AddActivity(Activity* activity) {
   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));
 }
 
 void ActivityManagerImpl::RemoveActivity(Activity* activity) {
   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);
   }
 }
 
 void ActivityManagerImpl::UpdateActivity(Activity* activity) {
   ActivityViewManager* manager = ActivityViewManager::Get();
   manager->UpdateActivity(activity);
 }
 
+void ActivityManagerImpl::AddObserver(ActivityManagerObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ActivityManagerImpl::RemoveObserver(ActivityManagerObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 // 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