main.dart

// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';
import 'dart:isolate';
import 'dart-ext:sample_extension';

// A class caches the native port used to call an asynchronous extension.
class RandomArray {
  static SendPort _port;

  Future<String> randomArray() {
    var completer = new Completer<String>();
    var replyPort = new RawReceivePort();
    var args = new List(1);
    args[0] = replyPort.sendPort;
    _servicePort.send(args);
    replyPort.handler = (result) {
      replyPort.close(); // <- This is never reached!!!!
      if (result != null) {
        completer.complete(result);
      } else {
        completer.completeError(new Exception("Random array creation failed"));
      }
    };
    return completer.future;
  }

  SendPort get _servicePort {
    if (_port == null) {
      _port = _newServicePort();
    }
    return _port;
  }

  SendPort _newServicePort() native "RandomArray_ServicePort";
}

Future main(List<String> args) async {
  print(await RandomArray().randomArray());
}