| // Copyright (c) 2018, 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. |
| |
| /** |
| * @assertion Future |
| * Future<RawSocketEvent> firstWhere ( |
| * bool test(T element), { |
| * dynamic defaultValue(), |
| * T orElse() |
| * }) |
| * Finds the first element of this stream matching test. |
| * . . . |
| * Stops listening to the stream after the first matching element has been |
| * received. |
| * |
| * Internally the method cancels its subscription after the first element that |
| * matches the predicate. This means that single-subscription (non-broadcast) |
| * streams are closed and cannot be reused after a call to this method. |
| * |
| * @description Checks that the method cancels its subscription after the first |
| * element that matches the predicate, and single-subscription (non-broadcast) |
| * streams are closed and cannot be reused after a call to this method. |
| * @author ngl@unipro.ru |
| */ |
| import "dart:io"; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| asyncStart(); |
| var address = InternetAddress.loopbackIPv4; |
| RawDatagramSocket.bind(address, 0).then((producer) { |
| RawDatagramSocket.bind(address, 0).then((receiver) { |
| int sent = 0; |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent], address, receiver.port); |
| producer.close(); |
| |
| Future fValue = receiver.firstWhere((e) => true); |
| fValue.then((value) { |
| Expect.equals(RawSocketEvent.write, value); |
| }).whenComplete(() { |
| Expect.throws(() => receiver.listen((e) { |
| print(e); |
| })); |
| asyncEnd(); |
| }); |
| }); |
| }); |
| } |