spawn<T> static method

Future<FlutterIsolate> spawn<T>(void entryPoint(T message), T message)

Creates and spawns a flutter isolate that shares the same code as the current isolate. The spawned isolate will be able to use flutter plugins. T can be any type that can be normally be passed through to regular isolate's entry point.

Implementation

static Future<FlutterIsolate> spawn<T>(
    void entryPoint(T message), T message) async {
  final userEntryPointId =
      PluginUtilities.getCallbackHandle(entryPoint)!.toRawHandle();
  final isolateId = Uuid().v4();
  final isolateResult = Completer<FlutterIsolate>();
  final setupReceivePort = ReceivePort();

  IsolateNameServer.registerPortWithName(
      setupReceivePort.sendPort, isolateId);
  late StreamSubscription setupSubscription;
  setupSubscription = setupReceivePort.listen((data) {
    final portSetup = (data as List<dynamic>);
    final setupPort = portSetup[0] as SendPort;
    final remoteIsolate = FlutterIsolate._(
        isolateId, portSetup[1] as SendPort?, portSetup[2], portSetup[3]);

    setupPort.send(<Object?>[userEntryPointId, message]);

    setupSubscription.cancel();
    setupReceivePort.close();
    isolateResult.complete(remoteIsolate);
  });
  _control.invokeMethod("spawn_isolate", {
    "entry_point":
        PluginUtilities.getCallbackHandle(_flutterIsolateEntryPoint)!
            .toRawHandle(),
    "isolate_id": isolateId
  });
  return isolateResult.future;
}