chromium/chrome/browser/local_discovery/fake_service_discovery_device_lister.h

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_LOCAL_DISCOVERY_FAKE_SERVICE_DISCOVERY_DEVICE_LISTER_H_
#define CHROME_BROWSER_LOCAL_DISCOVERY_FAKE_SERVICE_DISCOVERY_DEVICE_LISTER_H_

#include <set>
#include <string>
#include <vector>

#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/task/task_runner.h"
#include "chrome/browser/local_discovery/service_discovery_client.h"
#include "chrome/browser/local_discovery/service_discovery_device_lister.h"

namespace local_discovery {

// This is a thin wrapper around Delegate that defers callbacks until the actual
// delegate is initialized and then calls all deferred callbacks. Once the
// actual delegate is initialized, this just becomes a simple passthrough.
class DeferringDelegate : public ServiceDiscoveryDeviceLister::Delegate { … };

// A fake ServiceDiscoveryDeviceLister. This provides an implementation of
// ServiceDiscoveryDeviceLister that tests can use to trigger the addition and
// removal of devices.
//
// There's some hackery here to handle constructor order constraints. There's a
// circular dependency in that device lister delegate implementations need their
// device lister set to be supplied at construction time, and each device lister
// needs to know about its delegate for callbacks. Thus, a DeferringDelegate is
// used to queue callbacks triggered before the class has the delegate
// reference, and those queued callbacks are invoked when the delegate is set.
class FakeServiceDiscoveryDeviceLister final
    : public ServiceDiscoveryDeviceLister { … };

}  // namespace local_discovery

#endif  // CHROME_BROWSER_LOCAL_DISCOVERY_FAKE_SERVICE_DISCOVERY_DEVICE_LISTER_H_