| 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 '../worker/worker.dart'; |
| 7 | | | import 'task.dart'; |
| 8 | | | import 'worker_pool.dart'; |
| 9 | | | |
| 10 | | | /// [WorkerTask] registered in the [WorkerPool]. |
| 11 | | | abstract base class WorkerTask<T, W extends Worker> implements Task<T> { |
| 12 | | 12 | WorkerTask(this._counter) : submitted = microsecTimeStamp(); |
| 13 | | | |
| 14 | | | final int submitted; |
| 15 | | | int? _scheduled; |
| 16 | | | int? _finished; |
| 17 | | | int? _canceled; |
| 18 | | | |
| 19 | | | final PerfCounter? _counter; |
| 20 | | | |
| 21 | | | final _done = Completer<void>(); |
| 22 | | | |
| 23 | | | /// Returns a future that will complete when the task has run. |
| 24 | | 1 | @override |
| 25 | | 3 | Future<void> get done => _done.future; |
| 26 | | | |
| 27 | | 4 | @override |
| 28 | | 8 | bool get isCanceled => _canceled != null; |
| 29 | | | |
| 30 | | 1 | @override |
| 31 | | 3 | bool get isPending => _scheduled == null && _canceled == null; |
| 32 | | | |
| 33 | | 2 | @override |
| 34 | | 2 | bool get isFinished => |
| 35 | | 8 | _scheduled != null && _finished != null && _canceled == null; |
| 36 | | | |
| 37 | | 2 | @override |
| 38 | | 2 | bool get isRunning => |
| 39 | | 7 | _scheduled != null && _finished == null && _canceled == null; |
| 40 | | | |
| 41 | | 1 | @override |
| 42 | | 2 | Duration get runningTime => _scheduled == null |
| 43 | | 1 | ? Duration.zero |
| 44 | | 0 | : Duration( |
| 45 | | | microseconds: |
| 46 | | 1 | (_canceled ?? _finished ?? microsecTimeStamp()) - _scheduled!); |
| 47 | | | |
| 48 | | 0 | @override |
| 49 | | 0 | Duration get waitTime => Duration( |
| 50 | | | microseconds: |
| 51 | | 0 | (_scheduled ?? _canceled ?? microsecTimeStamp()) - submitted); |
| 52 | | | |
| 53 | | | TaskCanceledException? _canceledException; |
| 54 | | 6 | TaskCanceledException? get canceledException => _canceledException; |
| 55 | | | |
| 56 | | 4 | void throwIfCanceled() { |
| 57 | | 8 | if (_canceledException != null) throw _canceledException!; |
| 58 | | | } |
| 59 | | | |
| 60 | | 2 | @override |
| 61 | | 2 | void cancel([String? message]) { |
| 62 | | 6 | _canceled ??= microsecTimeStamp(); |
| 63 | | 6 | _canceledException ??= TaskCanceledException(message); |
| 64 | | 4 | if (_scheduled == null) { |
| 65 | | | // task will not be scheduled, make sure it reports as completed |
| 66 | | 6 | _done.complete(); |
| 67 | | | } |
| 68 | | 2 | } |
| 69 | | | |
| 70 | | 8 | void _success(bool res) { |
| 71 | | 12 | _finished ??= microsecTimeStamp(); |
| 72 | | 12 | _counter?.update(_finished! - _scheduled!, res); |
| 73 | | 12 | _done.complete(); |
| 74 | | 4 | } |
| 75 | | | |
| 76 | | 0 | void _error(_) { |
| 77 | | 0 | _finished ??= microsecTimeStamp(); |
| 78 | | 0 | _counter?.update(_finished! - _scheduled!, false); |
| 79 | | 0 | _done.complete(); |
| 80 | | 0 | } |
| 81 | | | |
| 82 | | 8 | Future<void> run(W worker) async { |
| 83 | | 12 | _scheduled ??= microsecTimeStamp(); |
| 84 | | | |
| 85 | | 20 | return execute(worker).then(_success, onError: _error); |
| 86 | | 4 | } |
| 87 | | | |
| 88 | | | Future<bool> execute(W worker); |
| 89 | | | } |