| // 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 Stream<RawSocketEvent> takeWhile(bool test(T element)) |
| /// Forwards data events while test is successful. |
| /// . . . |
| /// Stops listening to this stream after the accepted elements. |
| /// |
| /// Internally the method cancels its subscription after these elements. This |
| /// means that single-subscription (non-broadcast) streams are closed and cannot |
| /// be reused after a call to this method. |
| /// |
| /// @description Checks that method [takeWhile] stops listening to the stream |
| /// after the accepted elements and cancels its subscription, so that |
| /// 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"; |
| |
| check(bool test(e), dataExpected) { |
| asyncStart(); |
| var address = InternetAddress.loopbackIPv4; |
| RawDatagramSocket.bind(address, 0).then((producer) { |
| RawDatagramSocket.bind(address, 0).then((receiver) { |
| int sent = 0; |
| List list = []; |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent++], address, receiver.port); |
| producer.close(); |
| |
| Stream s = receiver.takeWhile(test); |
| s.listen((event) { |
| list.add(event); |
| receiver.receive(); |
| }, onDone: () { |
| Expect.listEquals(dataExpected, list); |
| asyncEnd(); |
| }); |
| |
| try { |
| s.listen((event) { |
| Expect.fail('Should not be here.'); |
| }); |
| } catch (e) { |
| Expect.isTrue(e is StateError); |
| } |
| |
| new Timer(const Duration(milliseconds: 200), () { |
| Expect.isNull(receiver.receive()); |
| receiver.close(); |
| }); |
| }); |
| }); |
| } |
| |
| main() { |
| List expected = [ |
| RawSocketEvent.write, |
| RawSocketEvent.read, |
| RawSocketEvent.read, |
| RawSocketEvent.closed |
| ]; |
| check((e) => e != RawSocketEvent.closed, expected.sublist(0, 3)); |
| check((e) => e != RawSocketEvent.read, expected.sublist(0, 1)); |
| check((e) => true, expected); |
| check((e) => false, []); |
| } |