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// Copyright 2019 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_PERFORMANCE_MANAGER_PUBLIC_PERFORMANCE_MANAGER_OBSERVER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERFORMANCE_MANAGER_OBSERVER_H_
#include "base/observer_list_types.h"
namespace content {
class WebContents;
} // namespace content
namespace performance_manager {
// Interface to observe PerformanceManager events that happen on the main
// thread. All methods are invoked on the main thread.
class PerformanceManagerObserver : public base::CheckedObserver {
public:
~PerformanceManagerObserver() override = default;
// Invoked when a PageNode is created for |web_contents|. The PageNode can be
// retrieved via PerformanceManager::GetPageNodeForWebContents(). The PageNode
// will be destroyed when |web_contents| is destroyed or when the
// PerformanceManagerRegistry is destroyed, whichever comes first.
virtual void OnPageNodeCreatedForWebContents(
content::WebContents* web_contents) = 0;
// Invoked before the PM is torn down on the main thread.
virtual void OnBeforePerformanceManagerDestroyed() = 0;
protected:
PerformanceManagerObserver() = default;
};
// A default implementation of the observer, with all methods stubbed out.
class PerformanceManagerObserverDefaultImpl
: public PerformanceManagerObserver {
public:
~PerformanceManagerObserverDefaultImpl() override = default;
// PerformanceManagerObserver implementation:
void OnPageNodeCreatedForWebContents(
content::WebContents* web_contents) override {}
void OnBeforePerformanceManagerDestroyed() override {}
protected:
PerformanceManagerObserverDefaultImpl() = default;
};
} // namespace performance_manager
#endif // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERFORMANCE_MANAGER_OBSERVER_H_
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