library esiur;

import 'AsyncReply.dart';

class AsyncQueue<T> extends AsyncReply<T?> {
  List<AsyncReply<T?>> _list = <AsyncReply<T?>>[];

//      object queueLock = new object();

  add(AsyncReply<T> reply) {
    //lock (queueLock)
    _list.add(reply);

    //super._resultReady = false;
    super.setResultReady(false);

    reply.then(processQueue);
  }

  remove(AsyncReply<T> reply) {
    //lock (queueLock)
    _list.remove(reply);
    processQueue(null);
  }

  void processQueue(T? o) {
    //lock (queueLock)
    for (var i = 0; i < _list.length; i++)
      if (_list[i].ready) {
        super.trigger(_list[i].result);
        super.ready = false;
        _list.removeAt(i);
        i--;
      } else
        break;

    //super._resultReady = (_list.length == 0);
    super.setResultReady(_list.length == 0);
  }

  AsyncQueue() {}
}