| 1 | | | import 'dart:async'; |
| 2 | | | |
| 3 | | | import 'package:cancelation_token/cancelation_token.dart'; |
| 4 | | | import 'package:meta/meta.dart'; |
| 5 | | | |
| 6 | | | import '../_impl/xplat/_token_id.dart'; |
| 7 | | | import '../exceptions/squadron_canceled_exception.dart'; |
| 8 | | | |
| 9 | | | class SquadronCancelationToken extends CancelationToken { |
| 10 | | 1 | SquadronCancelationToken._(this.token, this.id) { |
| 11 | | 4 | token?.onCanceled.then(_checkToken); |
| 12 | | | } |
| 13 | | | |
| 14 | | 1 | List serialize() { |
| 15 | | 1 | _checkToken(); |
| 16 | | 2 | return List.unmodifiable([ |
| 17 | | 1 | id, |
| 18 | | 2 | exception?.serialize(), |
| 19 | | | ]); |
| 20 | | | } |
| 21 | | | |
| 22 | | 1 | static SquadronCancelationToken? deserialize(List? props) { |
| 23 | | | if (props == null) return null; |
| 24 | | 1 | final id = props[_$id]; |
| 25 | | 2 | final ex = SquadronCanceledExceptionExt.deserialize(props[_$ex]); |
| 26 | | 1 | final token = SquadronCancelationToken._(null, id); |
| 27 | | | if (ex != null) { |
| 28 | | 1 | token._exception = ex; |
| 29 | | 2 | token._completer.complete(ex); |
| 30 | | | } |
| 31 | | | return token; |
| 32 | | | } |
| 33 | | | |
| 34 | | | // cancelation token ID |
| 35 | | | final String id; |
| 36 | | | |
| 37 | | | // reference to the real cancelation token (only set on the caller side, will |
| 38 | | | // be `null` in worker threads) |
| 39 | | | final CancelationToken? token; |
| 40 | | | |
| 41 | | 1 | @override |
| 42 | | 1 | SquadronCanceledException? get exception => _exception; |
| 43 | | | SquadronCanceledException? _exception; |
| 44 | | | |
| 45 | | 1 | @override |
| 46 | | | void ensureStarted() { |
| 47 | | 2 | token?.ensureStarted(); |
| 48 | | | } |
| 49 | | | |
| 50 | | 1 | @override |
| 51 | | 2 | Future<CanceledException> get onCanceled => _completer.future; |
| 52 | | | final _completer = Completer<CanceledException>(); |
| 53 | | | |
| 54 | | 1 | void _checkToken([dynamic _]) { |
| 55 | | 2 | final ex = token?.exception; |
| 56 | | | if (ex != null) { |
| 57 | | 3 | _exception ??= SquadronCanceledException.from(id, ex); |
| 58 | | 2 | if (!_completer.isCompleted) { |
| 59 | | 3 | _completer.complete(_exception); |
| 60 | | | } |
| 61 | | | } |
| 62 | | | } |
| 63 | | | } |
| 64 | | | |
| 65 | | | const _$id = 0; |
| 66 | | | const _$ex = 1; |
| 67 | | | |
| 68 | | | @internal |
| 69 | | | extension SquadronCancelationTokenExt on CancelationToken { |
| 70 | | 1 | SquadronCancelationToken wrap() { |
| 71 | | | final self = this; |
| 72 | | 1 | if (self is SquadronCancelationToken) return self; |
| 73 | | 2 | final token = SquadronCancelationToken._(self, TokenId.next()); |
| 74 | | 1 | token._checkToken(); |
| 75 | | | return token; |
| 76 | | | } |
| 77 | | | } |