Google Now Message Center Stats

chrome/browser/notifications/google_now_notification_stats_collector.cc

+// 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.
+
+#include "chrome/browser/notifications/google_now_notification_stats_collector.h"
+
+#include <string>
+
+#include "base/metrics/sparse_histogram.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/notifications/notification.h"
+#include "chrome/browser/notifications/notification_ui_manager.h"
+#include "content/public/browser/user_metrics.h"
+#include "ui/message_center/notification.h"
+
+namespace {
+const char kChromeNowExtensionID[] = "pafkbggdmjlpgkdkcbjmhmfcdpncadgh";
+const int kNotificationsMaxCount = 10;

[Ilya Sherman, 2014/05/06 00:33:39]

As I mentioned before, if you're worried that 10 might be too low, feel free to
bump this to something like 25.  Otherwise, if you decide to resize the
histogram later, you'll need to rename it as well -- histograms with data in
overflow buckets aren't designed to be resizable.

+}
+
+GoogleNowNotificationStatsCollector::GoogleNowNotificationStatsCollector(
+    message_center::MessageCenter* message_center)
+    : message_center_(message_center) {
+  message_center_->AddObserver(this);
+}
+
+GoogleNowNotificationStatsCollector::~GoogleNowNotificationStatsCollector() {
+  message_center_->RemoveObserver(this);
+}
+
+void GoogleNowNotificationStatsCollector::OnNotificationPoppedUp(
+    const std::string& notification_id) {
+  if (IsNotificationIdForGoogleNow(notification_id)) {
+    content::RecordAction(
+        base::UserMetricsAction(
+            "GoogleNow.MessageCenter.NotificationPoppedUp"));
+  }
+}
+
+void GoogleNowNotificationStatsCollector::OnCenterVisibilityChanged(
+    message_center::Visibility visibility) {
+  if (visibility == message_center::VISIBILITY_MESSAGE_CENTER) {
+    UMA_HISTOGRAM_SPARSE_SLOWLY(
+        "GoogleNow.MessageCenter.Displayed.NotificationsVisible",
+        std::min(CountVisibleGoogleNowNotifications(), kNotificationsMaxCount));
+  }
+}
+
+bool GoogleNowNotificationStatsCollector::IsNotificationIdForGoogleNow(
+  const std::string& notification_id) {
+  bool isGoogleNowNotification = false;
+  const Notification* const notification =
+      g_browser_process->notification_ui_manager()->FindById(notification_id);
+  if (notification) {
+    isGoogleNowNotification =
+        (notification->notifier_id().id == kChromeNowExtensionID);
+  }
+  return isGoogleNowNotification;
+}
+
+int GoogleNowNotificationStatsCollector::CountVisibleGoogleNowNotifications() {
+  typedef message_center::NotificationList::Notifications Notifications;
+  const Notifications visible_notifications =
+      message_center_->GetVisibleNotifications();
+  int google_now_notification_count = 0;
+  for (Notifications::iterator iter = visible_notifications.begin();
+      iter != visible_notifications.end();
+      ++iter) {
+    if ((*iter)->notifier_id().id == kChromeNowExtensionID)
+      google_now_notification_count++;
+  }
+  return google_now_notification_count;
+}