Google Now Message Center Stats

chrome/browser/notifications/google_now_notification_stats_collector.h

+// 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_GOOGLE_NOW_NOTIFICATION_STATS_COLLECTOR_H_
+#define CHROME_BROWSER_NOTIFICATIONS_GOOGLE_NOW_NOTIFICATION_STATS_COLLECTOR_H_
+
+#include <string>
+
+#include "ui/message_center/message_center.h"
+#include "ui/message_center/message_center_observer.h"
+#include "ui/message_center/message_center_types.h"
+
+// The Google Now Notification Stats Collector listens for message center
+// events and records stats about Google Now specific notifications.
+class GoogleNowNotificationStatsCollector
+    : public message_center::MessageCenterObserver {
+ public:
+  explicit GoogleNowNotificationStatsCollector(
+      message_center::MessageCenter* message_center);
+  virtual ~GoogleNowNotificationStatsCollector();
+
+ private:
+  // MessageCenterObserver
+  virtual void OnNotificationDisplayed(
+      const std::string& notification_id,
+      const message_center::DisplaySource source) OVERRIDE;
+  virtual void OnCenterVisibilityChanged(
+      message_center::Visibility visibility) OVERRIDE;
+
+  // Counts the number of Google Now Notifications in the message center.
+  int CountVisibleGoogleNowNotifications();
+
+  // Returns true if the notification ID is for Google Now.
+  bool IsNotificationIdForGoogleNow(const std::string& notification_id);
+
+  // Weak, global.
+  message_center::MessageCenter* message_center_;
+
+  DISALLOW_COPY_AND_ASSIGN(GoogleNowNotificationStatsCollector);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_GOOGLE_NOW_NOTIFICATION_STATS_COLLECTOR_H_