chrome/browser/google/google_search_counter.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_GOOGLE_GOOGLE_SEARCH_COUNTER_H_
   6 #define CHROME_BROWSER_GOOGLE_GOOGLE_SEARCH_COUNTER_H_
   7
   8 #include "base/memory/singleton.h"
   9 #include "components/google/core/browser/google_search_metrics.h"
  10 #include "content/public/browser/notification_observer.h"
  11 #include "content/public/browser/notification_registrar.h"
  12
  13 // A listener for counting Google searches from various search access points. No
  14 // actual search query content is observed. See GoogleSearchMetrics for more
  15 // details about these access points.
  16 class GoogleSearchCounter : content::NotificationObserver {
  17  public:
  18   // Initialize the global instance.
  19   static void RegisterForNotifications();
  20
  21   // Return the singleton instance of GoogleSearchCounter.
  22   static GoogleSearchCounter* GetInstance();
  23
  24  private:
  25   friend struct DefaultSingletonTraits<GoogleSearchCounter>;
  26   friend class GoogleSearchCounterTest;
  27
  28   GoogleSearchCounter();
  29   virtual ~GoogleSearchCounter();
  30
  31   void ProcessCommittedEntry(const content::NotificationSource& source,
  32                              const content::NotificationDetails& details);
  33
  34   // Replace the internal metrics object with a dummy or a mock. This instance
  35   // takes ownership of |search_metrics|.
  36   void SetSearchMetricsForTesting(GoogleSearchMetrics* search_metrics);
  37
  38   // Register this counter for all notifications we care about.
  39   void RegisterForNotificationsInternal();
  40
  41   // content::NotificationObserver
  42   virtual void Observe(int type,
  43                        const content::NotificationSource& source,
  44                        const content::NotificationDetails& details) OVERRIDE;
  45
  46   content::NotificationRegistrar registrar_;
  47   scoped_ptr<GoogleSearchMetrics> search_metrics_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(GoogleSearchCounter);
  50 };
  51
  52 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_SEARCH_COUNTER_H_