chromium/content/browser/service_worker/service_worker_usb_delegate_observer.h

// 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_USB_DELEGATE_OBSERVER_H_
#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_USB_DELEGATE_OBSERVER_H_

#include "base/memory/weak_ptr.h"
#include "base/scoped_observation_traits.h"
#include "content/browser/service_worker/service_worker_device_delegate_observer.h"
#include "content/browser/usb/web_usb_service_impl.h"
#include "content/public/browser/usb_delegate.h"

namespace content {

class ServiceWorkerContextCore;

// ServiceWorkerUsbDelegateObserver acts as a broker between the
// content::WebUsbService and content::UsbDelegate when the WebUsbService is
// created for a service worker. Each ServiceWorkerContextCore has one
// ServiceWorkerUsbDelegateObserver, which is used to track all of the
// ServiceWorkerRegistration objects whose script uses the WebUSB API.
// Furthermore, when a device event happens, the
// ServiceWorkerUsbDelegateObserver's UsbDelegate::Observer methods will be
// invoked and deliver the device events to the service worker that has a device
// event handler registered.
// For more information, please see go/usb-hid-extension-access.
class CONTENT_EXPORT ServiceWorkerUsbDelegateObserver
    : public ServiceWorkerDeviceDelegateObserver,
      public UsbDelegate::Observer { … };

}  // namespace content

namespace base {

template <>
struct ScopedObservationTraits<content::UsbDelegate,
                               content::ServiceWorkerUsbDelegateObserver> { … };

}  // namespace base

#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_USB_DELEGATE_OBSERVER_H_