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      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 "chrome/browser/google/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_
     53