chrome/browser/ui/uma_browsing_activity_observer.h

   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 CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_
   6 #define CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_
   7
   8 #include "content/public/browser/notification_registrar.h"
   9 #include "content/public/browser/notification_observer.h"
  10
  11 namespace chrome {
  12
  13 // This object is instantiated when the first Browser object is added to the
  14 // list and delete when the last one is removed. It watches for loads and
  15 // creates histograms of some global object counts.
  16 class UMABrowsingActivityObserver : public content::NotificationObserver {
  17  public:
  18   static void Init();
  19
  20  private:
  21   UMABrowsingActivityObserver();
  22   ~UMABrowsingActivityObserver() override;
  23
  24   // content::NotificationObserver implementation.
  25   void Observe(int type,
  26                const content::NotificationSource& source,
  27                const content::NotificationDetails& details) override;
  28
  29   // Counts the number of active RenderProcessHosts and logs them.
  30   void LogRenderProcessHostCount() const;
  31
  32   // Counts the number of tabs in each browser window and logs them. This is
  33   // different than the number of WebContents objects since WebContents objects
  34   // can be used for popups and in dialog boxes. We're just counting toplevel
  35   // tabs here.
  36   void LogBrowserTabCount() const;
  37
  38   content::NotificationRegistrar registrar_;
  39
  40   DISALLOW_COPY_AND_ASSIGN(UMABrowsingActivityObserver);
  41 };
  42
  43 }  // namespace chrome
  44
  45 #endif  // CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_