| 1 | | | import 'dart:async'; |
| 2 | | | |
| 3 | | | import '../_impl/xplat/_time_stamp.dart'; |
| 4 | | | import '../exceptions/task_canceled_exception.dart'; |
| 5 | | | import '../stats/perf_counter.dart'; |
| 6 | | | import '../utils.dart'; |
| 7 | | | import '../worker/worker.dart'; |
| 8 | | | import 'task.dart'; |
| 9 | | | import 'worker_pool.dart'; |
| 10 | | | |
| 11 | | | /// [WorkerTask] registered in the [WorkerPool]. |
| 12 | | | abstract base class WorkerTask<T, W extends Worker> implements Task<T> { |
| 13 | | 8 | WorkerTask(this._counter) : submitted = Timestamp.now(); |
| 14 | | | |
| 15 | | | final Timestamp submitted; |
| 16 | | | Timestamp? _scheduled; |
| 17 | | | Timestamp? _finished; |
| 18 | | | Timestamp? _canceled; |
| 19 | | | |
| 20 | | | final PerfCounter? _counter; |
| 21 | | | |
| 22 | | 4 | @override |
| 23 | | 4 | bool get isCanceled => _canceled != null; |
| 24 | | | |
| 25 | | 1 | @override |
| 26 | | 2 | bool get isPending => _scheduled == null && _canceled == null; |
| 27 | | | |
| 28 | | 2 | @override |
| 29 | | | bool get isFinished => |
| 30 | | 6 | _scheduled != null && _finished != null && _canceled == null; |
| 31 | | | |
| 32 | | 2 | @override |
| 33 | | | bool get isRunning => |
| 34 | | 4 | _scheduled != null && _finished == null && _canceled == null; |
| 35 | | | |
| 36 | | 1 | @override |
| 37 | | 1 | Duration get runningTime => _scheduled == null |
| 38 | | | ? Duration.zero |
| 39 | | 0 | : (_canceled ?? _finished ?? Timestamp.now()).elapsedSince(_scheduled!); |
| 40 | | | |
| 41 | | 0 | @override |
| 42 | | | Duration get waitTime => |
| 43 | | 0 | (_scheduled ?? _canceled ?? Timestamp.now()).elapsedSince(submitted); |
| 44 | | | |
| 45 | | | final _done = Completer<void>(); |
| 46 | | | |
| 47 | | 1 | @override |
| 48 | | 2 | Future<void> get done => _done.future; |
| 49 | | | |
| 50 | | | TaskCanceledException? _canceledException; |
| 51 | | 8 | TaskCanceledException? get canceledException => _canceledException; |
| 52 | | | |
| 53 | | 4 | void throwIfCanceled() { |
| 54 | | 4 | if (_canceledException != null) throw _canceledException!; |
| 55 | | | } |
| 56 | | | |
| 57 | | 2 | @override |
| 58 | | | void cancel([String? message]) { |
| 59 | | 4 | if (_finished != null || _canceled != null) return; |
| 60 | | 4 | _canceled ??= Timestamp.now(); |
| 61 | | 4 | _canceledException ??= TaskCanceledException(message); |
| 62 | | 2 | if (_scheduled == null) { |
| 63 | | | // task will not be scheduled, make sure it reports as errored |
| 64 | | 2 | _fail(); |
| 65 | | | } |
| 66 | | | } |
| 67 | | | |
| 68 | | 2 | void _fail([Object? _]) { |
| 69 | | 4 | final finished = _finished ??= Timestamp.now(); |
| 70 | | 2 | _counter?.update(finished - (_scheduled ?? finished), false); |
| 71 | | 4 | _done.safeComplete(); |
| 72 | | | } |
| 73 | | | |
| 74 | | 4 | Future<void> run(W worker) { |
| 75 | | 8 | _scheduled ??= Timestamp.now(); |
| 76 | | 8 | return execute(worker).then( |
| 77 | | 4 | (res) { |
| 78 | | 8 | _finished ??= Timestamp.now(); |
| 79 | | 8 | _counter?.update(_finished! - _scheduled!, res); |
| 80 | | 8 | _done.safeComplete(); |
| 81 | | | }, |
| 82 | | 4 | onError: _fail, |
| 83 | | | ); |
| 84 | | | } |
| 85 | | | |
| 86 | | | Future<bool> execute(W worker); |
| 87 | | | } |