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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 CHROMEOS_ASH_COMPONENTS_TELEMETRY_EXTENSION_EVENTS_TELEMETRY_EVENT_FORWARDER_H_
#define CHROMEOS_ASH_COMPONENTS_TELEMETRY_EXTENSION_EVENTS_TELEMETRY_EVENT_FORWARDER_H_
#include "chromeos/ash/services/cros_healthd/public/mojom/cros_healthd_events.mojom.h"
#include "chromeos/crosapi/mojom/telemetry_event_service.mojom.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace ash {
// A class that handles an Event connection. For each subscription to an
// event category, and instance of this object is created. It handles the
// two necessary mojom connections for observing events:
// - The `mojo::Remote<crosapi::mojom::TelemetryEventObserver>` which holds
// a connection with crosapi. As soon as an event is triggered from
// cros_healthd, it should be forwarded to this remote.
// - The `mojo::Receiver<cros_healthd::mojom::EventObserver>`, which holds
// a connection with cros_healthd. The `OnEvent` message is invoked whenever
// cros_healthd monitors an event.
//
// The connection is "alive" while both connections with cros_healthd and
// crosapi are open. If one of them is closed, we also close the other open
// connection and this object can be deleted.
class CrosHealthdEventForwarder : public cros_healthd::mojom::EventObserver {
public:
explicit CrosHealthdEventForwarder(
mojo::PendingRemote<crosapi::mojom::TelemetryEventObserver>
crosapi_remote,
crosapi::mojom::TelemetryEventCategoryEnum category);
CrosHealthdEventForwarder(const CrosHealthdEventForwarder&) = delete;
CrosHealthdEventForwarder& operator=(const CrosHealthdEventForwarder&) =
delete;
~CrosHealthdEventForwarder() override;
// cros_healthd::mojom::EventObserver:
void OnEvent(cros_healthd::mojom::EventInfoPtr info) override;
mojo::Remote<crosapi::mojom::TelemetryEventObserver>& GetRemote();
private:
const crosapi::mojom::TelemetryEventCategoryEnum category_;
// The mojo remote that corresponds to a crosapi observer connection.
mojo::Remote<crosapi::mojom::TelemetryEventObserver> remote_;
};
} // namespace ash
#endif // CHROMEOS_ASH_COMPONENTS_TELEMETRY_EXTENSION_EVENTS_TELEMETRY_EVENT_FORWARDER_H_
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