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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_LIFECYCLE_OBSERVER_H_
#define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_LIFECYCLE_OBSERVER_H_
#include "components/page_load_metrics/browser/metrics_web_contents_observer.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list_types.h"
#include "content/public/browser/web_contents.h"
namespace page_load_metrics {
class PageLoadTracker;
// |MetricsLifecycleObserver| allows clients to observe lifecycle events for a
// given |MetricsWebContentsObserver|. It is only used in testing but will work
// as intended if used in production.
class MetricsLifecycleObserver : public base::CheckedObserver {
public:
explicit MetricsLifecycleObserver(content::WebContents* web_contents);
MetricsLifecycleObserver(const MetricsLifecycleObserver&) = delete;
MetricsLifecycleObserver& operator=(const MetricsLifecycleObserver&) = delete;
MetricsLifecycleObserver(MetricsLifecycleObserver&&) = delete;
MetricsLifecycleObserver& operator=(MetricsLifecycleObserver&&) = delete;
~MetricsLifecycleObserver() override;
void OnGoingAway();
// Some |PageLoadTiming| messages will race with the navigation commit.
// |OnTrackerCreated()| allows client code to manipulate the
// |PageLoadTracker| very early (eg, to add observers).
virtual void OnTrackerCreated(PageLoadTracker* tracker) {}
// In cases where |LoadTimingInfo| is not needed, waiting until commit is
// fine.
virtual void OnCommit(PageLoadTracker* tracker) {}
// This is called both for prerender activation and restoration from
// the back/forward cache.
virtual void OnActivate(PageLoadTracker* tracker) {}
// Returns the observer delegate for the committed load associated with
// the |MetricsWebContentsObserver|, or null if the observer has gone away
// (via MetricsWebContentsObserver::WebContentsDestroyed).
const PageLoadMetricsObserverDelegate* GetDelegateForCommittedLoad();
private:
raw_ptr<MetricsWebContentsObserver> observer_;
};
} // namespace page_load_metrics
#endif // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_LIFECYCLE_OBSERVER_H_
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