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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_
#define CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_
#include "base/callback_list.h"
#include "chrome/browser/ui/tabs/tab_strip_model_stats_recorder.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
// This object is instantiated during startup, before the first Browser object
// is added to the list and deleted during shutdown. It watches for loads and
// creates histograms of some global object counts.
class UMABrowsingActivityObserver {
public:
UMABrowsingActivityObserver(const UMABrowsingActivityObserver&) = delete;
UMABrowsingActivityObserver& operator=(const UMABrowsingActivityObserver&) =
delete;
static void Init();
// Notifies `UMABrowsingActivityObserver` with tab related events.
class TabHelper : public content::WebContentsObserver,
public content::WebContentsUserData<TabHelper> {
public:
TabHelper(const TabHelper&) = delete;
TabHelper& operator=(const TabHelper&) = delete;
~TabHelper() override;
// content::WebContentsObserver
void NavigationEntryCommitted(
const content::LoadCommittedDetails& load_details) override;
private:
explicit TabHelper(content::WebContents* web_contents);
friend class content::WebContentsUserData<TabHelper>;
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
private:
UMABrowsingActivityObserver();
~UMABrowsingActivityObserver();
void OnNavigationEntryCommitted(
content::WebContents* web_contents,
const content::LoadCommittedDetails& load_details) const;
void OnAppTerminating() const;
// Calculates the time from an update being visible to the browser and
// the browser restarting or quitting and logs it.
void LogTimeBeforeUpdate() const;
// Counts the number of tabs in each browser window and logs them. This is
// different than the number of WebContents objects since WebContents objects
// can be used for popups and in dialog boxes. We're just counting toplevel
// tabs here.
void LogBrowserTabCount() const;
const TabStripModelStatsRecorder tab_recorder_;
base::CallbackListSubscription subscription_;
};
#endif // CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_
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