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// Copyright 2013 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_UI_WEBUI_NTP_NTP_USER_DATA_LOGGER_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_NTP_USER_DATA_LOGGER_H_
#include "chrome/common/ntp_logging_events.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
namespace content {
class WebContents;
}
// Helper class for logging data from the NTP. Attached to each NTP instance.
class NTPUserDataLogger
: public content::WebContentsObserver,
public content::WebContentsUserData<NTPUserDataLogger> {
public:
virtual ~NTPUserDataLogger();
static NTPUserDataLogger* GetOrCreateFromWebContents(
content::WebContents* content);
// Logs the error percentage rate when loading thumbnail images for this NTP
// session to UMA histogram. Called when the user navigates to a URL. Only
// called for the instant NTP.
void EmitThumbnailErrorRate();
// Logs a number of statistics regarding the NTP. Called when an NTP tab is
// about to be deactivated (be it by switching tabs, losing focus or closing
// the tab/shutting down Chrome), or when the user navigates to a URL.
void EmitNtpStatistics();
// Called each time an event occurs on the NTP that requires a counter to be
// incremented.
void LogEvent(NTPLoggingEventType event);
// content::WebContentsObserver override
virtual void NavigationEntryCommitted(
const content::LoadCommittedDetails& load_details) OVERRIDE;
protected:
explicit NTPUserDataLogger(content::WebContents* contents);
// Returns the percent error given |events| occurrences and |errors| errors.
virtual size_t GetPercentError(size_t errors, size_t events) const;
private:
friend class content::WebContentsUserData<NTPUserDataLogger>;
// Total number of mouseovers for this NTP session.
size_t number_of_mouseovers_;
// Total number of attempts made to load thumbnail images for this NTP
// session.
size_t number_of_thumbnail_attempts_;
// Total number of errors that occurred when trying to load thumbnail images
// for this NTP session. When these errors occur a grey tile is shown instead
// of a thumbnail image.
size_t number_of_thumbnail_errors_;
// Total number of attempts made to load thumbnail images while providing a
// fallback thumbnail for this NTP session.
size_t number_of_fallback_thumbnails_requested_;
// Total number of errors that occurred while trying to load the primary
// thumbnail image and that caused a fallback to the secondary thumbnail.
size_t number_of_fallback_thumbnails_used_;
// Total number of tiles for which the visual appearance is handled externally
// by the page itself.
size_t number_of_external_tiles_;
// True if at least one iframe came from a server-side suggestion. In
// practice, either all the iframes are server-side suggestions or none are.
bool server_side_suggestions_;
// The URL of this New Tab Page - varies based on NTP version.
GURL ntp_url_;
DISALLOW_COPY_AND_ASSIGN(NTPUserDataLogger);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_NTP_USER_DATA_LOGGER_H_
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