| // 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<RawSocketEvent> reduce( |
| /// RawSocketEvent combine(T previous, T element) |
| /// ) |
| /// . . . |
| /// Similar to Iterable.reduce, this function maintains a value, starting with |
| /// the first element of the stream and updated for each further element of this |
| /// stream. For each element after the first, the value is updated to the result |
| /// of calling combine with the previous value and the element. |
| /// |
| /// @description Checks that if this stream contains only one event, combine |
| /// method is not called and the returned future is completed with this single |
| /// event. |
| /// @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; |
| int nCalls = 0; |
| List list = []; |
| RawSocketEvent combine(RawSocketEvent previous, RawSocketEvent element) { |
| nCalls++; |
| list.add(previous); |
| list.add(element); |
| return element; |
| } |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent++], address, receiver.port); |
| producer.close(); |
| receiver.close(); |
| |
| Future future = receiver.reduce(combine); |
| future.then((event) { |
| Expect.equals(RawSocketEvent.closed, event); |
| Expect.equals(0, nCalls); |
| Expect.isTrue(list.isEmpty); |
| }).whenComplete(() { |
| asyncEnd(); |
| }); |
| }); |
| }); |
| } |