| // 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<T> lastWhere ( |
| /// bool test(T element), { |
| /// dynamic defaultValue(), |
| /// T orElse() |
| /// }) |
| /// Finds the last element in this stream matching test. |
| /// |
| /// As firstWhere, except that the last matching element is found. That means |
| /// that the result cannot be provided before this stream is done. |
| /// . . . |
| /// If no such element is found before this stream is done, and a orElse |
| /// function is provided, the result of calling orElse becomes the value |
| /// of the future. |
| /// |
| /// @description Checks that if no such element is found before this stream is |
| /// done, and a orElse function is provided, the result of calling orElse becomes |
| /// the value of the future. |
| /// @author ngl@unipro.ru |
| |
| import "dart:io"; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| check(test, rValue, expected) { |
| asyncStart(); |
| var address = InternetAddress.loopbackIPv4; |
| RawDatagramSocket.bind(address, 0).then((producer) { |
| RawDatagramSocket.bind(address, 0).then((receiver) { |
| int sent = 0; |
| int counter = 0; |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent], address, receiver.port); |
| producer.close(); |
| |
| Stream<RawSocketEvent> bcs = receiver.asBroadcastStream(); |
| Future fValue = bcs.lastWhere(test, orElse: rValue); |
| fValue.then((value) { |
| Expect.equals(expected, value); |
| }).whenComplete(() { |
| asyncEnd(); |
| }); |
| |
| new Timer(const Duration(milliseconds: 200), () { |
| Expect.isNull(receiver.receive()); |
| receiver.close(); |
| }); |
| |
| bcs.listen((event) { |
| counter++; |
| receiver.receive(); |
| }).onDone(() { |
| Expect.equals(4, counter); |
| }); |
| }); |
| }); |
| } |
| |
| main() { |
| check((e) => e == null, () => RawSocketEvent.readClosed, |
| RawSocketEvent.readClosed); |
| check((e) => e == 1, () => RawSocketEvent.read, RawSocketEvent.read); |
| check((e) => !(e is RawSocketEvent), () => RawSocketEvent.closed, |
| RawSocketEvent.closed); |
| check((e) => false, () => RawSocketEvent.write, RawSocketEvent.write); |
| } |