startIsolateJob method

@protected Future<void> startIsolateJob(IsolateInitParams isolateInitParams, EntryPoint<IsolateInitParams> entryPoint)

Isolates currently not suitable for our purpose. Most UI canvas calls are not accessible from isolates so we cannot produce the bitmap.

Implementation

@protected
Future<void> startIsolateJob(
    T isolateInitParams, EntryPoint<T> entryPoint) async {
  try {
    return await _queue.add(() async {
//        logNow("start sendport=$_sendPort");
      if (_sendPort != null) return;
      int _time = DateTime.now().millisecondsSinceEpoch;
      ReceivePort receivePort = ReceivePort();
      isolateInitParams.sendPort = receivePort.sendPort;
      _isolate = await Isolate.spawn<T>(entryPoint, isolateInitParams);
      // let the listener run in background
      Completer<SendPort> completer = Completer<SendPort>();
//        logNow("start sendport=$_sendPort vor listen");
      unawaited(_listenToIsolate(receivePort, completer));
//        logNow("start sendport=$_sendPort nach listen");
      _sendPort = await completer.future;
//        logNow("start sendport=$_sendPort nach setSendPort");
      _log.info(
          "Starting isolate mixin for ${this.runtimeType} took ${DateTime.now().millisecondsSinceEpoch - _time} ms");
    });
  } on TimeoutException {
    throw TimeoutException(
        "Timeout while starting isolate $isolateInitParams");
  }
}