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// Copyright 2023 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_PAGE_LOAD_METRICS_OBSERVERS_PREVIEW_PAGE_LOAD_METRICS_OBSERVER_H_
#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_PREVIEW_PAGE_LOAD_METRICS_OBSERVER_H_
#include "base/time/time.h"
#include "components/page_load_metrics/browser/page_load_metrics_observer.h"
// Records Link-Preview project related metrics to evaluate the project impact.
// So, it collects data from all kind of navigations regardless of the
// Link-Preview feature existence to analyse users' activity trend.
// As a starting point, this class experimentally records page visit types and
// total foreground time duration for each visit type to analyze a.k.a unwanted
// navigations.
class PreviewPageLoadMetricsObserver
: public page_load_metrics::PageLoadMetricsObserver {
public:
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
// As we don't identify client redirect cases, kPassingVisit may be
// overestimated a little.
enum class PageVisitType {
kObsoleteIndependentVisit = 0,
kObsoleteOriginVisit = 1,
kPassingVisit = 2,
kTerminalVisit = 3,
kHistoryVisit = 4,
kIndependentLinkVisit = 5,
kIndependentUIVisit = 6,
kOriginLinkVisit = 7,
kOriginUIVisit = 8,
kMaxValue = kOriginUIVisit,
};
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class PreviewFinalStatus {
// Preview started, but the page wasn't promoted in any way
kPreviewed = 0,
// Preview started, and the page was promoted into a new tab
kPromoted = 1,
// TODO(b:292184832): Will define another entry for the promotion to the
// current tab
kMaxValue = kPromoted,
};
PreviewPageLoadMetricsObserver() = default;
PreviewPageLoadMetricsObserver(const PreviewPageLoadMetricsObserver&) =
delete;
PreviewPageLoadMetricsObserver& operator=(
const PreviewPageLoadMetricsObserver&) = delete;
~PreviewPageLoadMetricsObserver() override = default;
// page_load_metrics::PageLoadMetricsObserver implementation:
ObservePolicy OnStart(content::NavigationHandle* navigation_handle,
const GURL& currently_committed_url,
bool started_in_foreground) override;
ObservePolicy OnFencedFramesStart(
content::NavigationHandle* navigation_handle,
const GURL& currently_committed_url) override;
ObservePolicy OnPrerenderStart(content::NavigationHandle* navigation_handle,
const GURL& currently_committed_url) override;
ObservePolicy OnPreviewStart(content::NavigationHandle* navigation_handle,
const GURL& currently_committed_url) override;
ObservePolicy FlushMetricsOnAppEnterBackground(
const page_load_metrics::mojom::PageLoadTiming& timing) override;
ObservePolicy OnHidden(
const page_load_metrics::mojom::PageLoadTiming& timing) override;
ObservePolicy OnShown() override;
void OnComplete(
const page_load_metrics::mojom::PageLoadTiming& timing) override;
void DidActivatePreviewedPage(base::TimeTicks activation_time) override;
private:
enum class Status {
kNotPreviewed,
kPreviewed,
kPromoted,
};
PageVisitType RecordPageVisitType();
void RecordMetrics();
void CheckPageTransitionType(content::NavigationHandle* navigation_handle);
PreviewFinalStatus ConvertStatusToPreviewFinalStatus(Status state);
bool currently_in_foreground_ = false;
bool is_history_navigation_ = false;
bool is_first_navigation_ = false;
base::TimeTicks last_time_shown_;
base::TimeDelta total_foreground_duration_;
Status status_ = Status::kNotPreviewed;
};
#endif // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_PREVIEW_PAGE_LOAD_METRICS_OBSERVER_H_
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