| 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 | | 4 | 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 | | | static int _startSequence = 0; |
| 19 | | | |
| 20 | | | /// The current capacity of this [PoolWorker]. |
| 21 | | 8 | int get capacity => _capacity; |
| 22 | | | |
| 23 | | | /// Whether this [PoolWorker] is stopped or idle. |
| 24 | | 6 | bool get isIdle => worker.isStopped || _capacity == _maxWorkload; |
| 25 | | | |
| 26 | | | /// Whether this [PoolWorker] is stopped. |
| 27 | | 12 | bool get isStopped => worker.isStopped; |
| 28 | | | |
| 29 | | | /// Run the specified [task] in the [worker]. |
| 30 | | 4 | Future<void> run(WorkerTask task) { |
| 31 | | 8 | _lastStart = _startSequence++; |
| 32 | | 8 | _capacity--; |
| 33 | | 16 | return task.run(worker).whenComplete(() { |
| 34 | | 8 | _capacity++; |
| 35 | | 12 | if (_capacity == _maxWorkload) { |
| 36 | | 4 | _lastStart = null; |
| 37 | | | } |
| 38 | | | }); |
| 39 | | | } |
| 40 | | | |
| 41 | | | /// Compares [PoolWorker] instances by capacity (descending) and last execution (ascending). |
| 42 | | 4 | static int compareCapacity(PoolWorker a, PoolWorker b) { |
| 43 | | 21 | if (a.capacity != b.capacity) return a.capacity.compareTo(b.capacity); |
| 44 | | 12 | if (a._lastStart == b._lastStart) return 0; |
| 45 | | 2 | if (a._lastStart == null) return -1; |
| 46 | | 2 | if (b._lastStart == null) return 1; |
| 47 | | 6 | return b._lastStart!.compareTo(a._lastStart!); |
| 48 | | | } |
| 49 | | | |
| 50 | | 3 | static WorkerStat getStats(PoolWorker w) => w.worker.getStats(); |
| 51 | | | } |