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 "chrome/browser/ui/tabs/tab_strip_model_stats_recorder.h"
   9 #include "content/public/browser/notification_observer.h"
  10 #include "content/public/browser/notification_registrar.h"
  11
  12 namespace chrome {
  13
  14 // This object is instantiated when the first Browser object is added to the
  15 // list and delete when the last one is removed. It watches for loads and
  16 // creates histograms of some global object counts.
  17 class UMABrowsingActivityObserver : public content::NotificationObserver {
  18  public:
  19   static void Init();
  20
  21  private:
  22   UMABrowsingActivityObserver();
  23   ~UMABrowsingActivityObserver() override;
  24
  25   // content::NotificationObserver implementation.
  26   void Observe(int type,
  27                const content::NotificationSource& source,
  28                const content::NotificationDetails& details) override;
  29
  30   // Counts the number of active RenderProcessHosts and logs them.
  31   void LogRenderProcessHostCount() const;
  32
  33   // Counts the number of tabs in each browser window and logs them. This is
  34   // different than the number of WebContents objects since WebContents objects
  35   // can be used for popups and in dialog boxes. We're just counting toplevel
  36   // tabs here.
  37   void LogBrowserTabCount() const;
  38
  39   content::NotificationRegistrar registrar_;
  40   TabStripModelStatsRecorder tab_recorder_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(UMABrowsingActivityObserver);
  43 };
  44
  45 }  // namespace chrome
  46
  47 #endif  // CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_