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// Copyright 2019 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 CONTENT_BROWSER_FEATURE_OBSERVER_H_
#define CONTENT_BROWSER_FEATURE_OBSERVER_H_
#include "base/containers/stack_container.h"
#include "base/macros.h"
#include "content/common/content_export.h"
#include "content/public/browser/global_routing_id.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "third_party/blink/public/mojom/feature_observer/feature_observer.mojom.h"
namespace content {
class FeatureObserverClient;
// Observer interface to be notified when frames hold resources.
// client interfaces will be called on the same sequence GetFeatureObserver is
// called from.
class CONTENT_EXPORT FeatureObserver : public blink::mojom::FeatureObserver {
public:
// |client_| must outlive FeatureObserver.
FeatureObserver(FeatureObserverClient* client, GlobalFrameRoutingId id);
~FeatureObserver() override;
FeatureObserver(const FeatureObserver&) = delete;
FeatureObserver& operator=(const FeatureObserver&) = delete;
void GetFeatureObserver(
mojo::PendingReceiver<blink::mojom::FeatureObserver> receiver);
// blink::mojom::FeatureObserver implementation:
// For a given FeatureObserver receiver passed in through Bind, register the
// lifetime of a feature of a given type.
void Register(mojo::PendingReceiver<blink::mojom::ObservedFeature> feature,
blink::mojom::ObservedFeatureType type) override;
private:
// FeatureObservers notifying us about features used in this frame.
mojo::ReceiverSet<blink::mojom::FeatureObserver> observers_;
// Registered features.
mojo::ReceiverSet<blink::mojom::ObservedFeature> features_by_type_
[static_cast<int>(blink::mojom::ObservedFeatureType::kMaxValue) + 1];
FeatureObserverClient* const client_;
const GlobalFrameRoutingId id_;
};
} // namespace content
#endif // CONTENT_BROWSER_FEATURE_OBSERVER_H_
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