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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 THIRD_PARTY_BLINK_RENDERER_MODULES_COMPUTE_PRESSURE_PRESSURE_CLIENT_IMPL_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_COMPUTE_PRESSURE_PRESSURE_CLIENT_IMPL_H_
#include "base/time/time.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "third_party/blink/public/mojom/compute_pressure/web_pressure_manager.mojom-blink.h"
#include "third_party/blink/public/mojom/compute_pressure/web_pressure_update.mojom-blink.h"
#include "third_party/blink/renderer/core/dom/dom_high_res_time_stamp.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/modules/compute_pressure/pressure_observer.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/mojo/heap_mojo_associated_receiver.h"
namespace blink {
class ExecutionContext;
class PressureObserverManager;
// This class implements the "device::mojom::blink::PressureClient"
// interface to receive "device::mojom::blink::PressureUpdate" from
// "content::PressureClientImpl" and broadcasts the information to active
// PressureObservers.
//
// This class keeps track of State and active PressureObservers per source type.
class MODULES_EXPORT PressureClientImpl final
: public GarbageCollected<PressureClientImpl>,
public ExecutionContextClient,
public mojom::blink::WebPressureClient {
public:
// kUninitialized: receiver_ is not bound.
// kInitializing: receiver_ is bound but the remote side is not bound.
// kInitialized: receiver_ and the remote side are both bound.
enum class State { kUninitialized, kInitializing, kInitialized };
PressureClientImpl(ExecutionContext*, PressureObserverManager*);
~PressureClientImpl() override;
PressureClientImpl(const PressureClientImpl&) = delete;
PressureClientImpl& operator=(const PressureClientImpl&) = delete;
// mojom::WebPressureClient implementation.
void OnPressureUpdated(mojom::blink::WebPressureUpdatePtr) override;
State state() const { return state_; }
void set_state(State state) { state_ = state; }
void AddObserver(PressureObserver*);
void RemoveObserver(PressureObserver*);
const HeapHashSet<Member<PressureObserver>>& observers() const {
return observers_;
}
mojo::PendingAssociatedRemote<mojom::blink::WebPressureClient>
BindNewEndpointAndPassRemote(scoped_refptr<base::SequencedTaskRunner>);
void Reset();
void Trace(Visitor*) const override;
private:
DOMHighResTimeStamp CalculateTimestamp(base::TimeTicks timestamp) const;
WeakMember<PressureObserverManager> manager_;
HeapMojoAssociatedReceiver<mojom::blink::WebPressureClient,
PressureClientImpl>
associated_receiver_;
HeapHashSet<Member<PressureObserver>> observers_;
State state_ = State::kUninitialized;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_COMPUTE_PRESSURE_PRESSURE_CLIENT_IMPL_H_
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