| 1 | | | import '../stats/worker_stat.dart'; |
| 2 | | | import '../worker/worker.dart'; |
| 3 | | | import '_worker_task.dart'; |
| 4 | | | import 'worker_pool.dart'; |
| 5 | | | |
| 6 | | | /// Class representing a [Worker] from a [WorkerPool]. |
| 7 | | | class PoolWorker<W extends Worker> { |
| 8 | | | /// Constructs a new [PoolWorker]. |
| 9 | | 8 | PoolWorker(this.worker, this._maxWorkload) : _capacity = _maxWorkload; |
| 10 | | | |
| 11 | | | /// The [Worker] associated to this [PoolWorker]. |
| 12 | | | final W worker; |
| 13 | | | |
| 14 | | | final int _maxWorkload; |
| 15 | | | int? _lastStart; |
| 16 | | | int _capacity; |
| 17 | | | |
| 18 | | | /// The current capacity of this [PoolWorker]. |
| 19 | | 12 | int get capacity => _capacity; |
| 20 | | | |
| 21 | | | /// Whether this [PoolWorker] is stopped or doing nothing. |
| 22 | | 7 | bool get isIdle => worker.isStopped || _capacity == _maxWorkload; |
| 23 | | | |
| 24 | | | /// Run the specified [task] in the [worker]. |
| 25 | | 8 | Future<void> run(WorkerTask task) { |
| 26 | | 16 | _lastStart = DateTime.now().millisecondsSinceEpoch; |
| 27 | | 8 | _capacity--; |
| 28 | | 20 | return task.run(worker).whenComplete(() { |
| 29 | | 12 | _capacity++; |
| 30 | | 16 | if (_capacity == _maxWorkload) { |
| 31 | | 8 | _lastStart = null; |
| 32 | | | } |
| 33 | | 4 | }); |
| 34 | | 4 | } |
| 35 | | | |
| 36 | | | /// Compares [PoolWorker] instances by capacity (descending) and last execution (ascending). |
| 37 | | 6 | static int compareCapacityDesc(PoolWorker a, PoolWorker b) { |
| 38 | | 21 | if (a.capacity != b.capacity) return b.capacity.compareTo(a.capacity); |
| 39 | | 6 | if (a._lastStart == null) return 1; |
| 40 | | 6 | if (b._lastStart == null) return -1; |
| 41 | | 12 | return a._lastStart!.compareTo(b._lastStart!); |
| 42 | | 3 | } |
| 43 | | | |
| 44 | | 16 | static bool isStopped(PoolWorker w) => w.worker.isStopped; |
| 45 | | 4 | static WorkerStat getStats(PoolWorker w) => w.worker.stats; |
| 46 | | | } |