| 1 | import EventEmitter from 'node:events' |
| 2 | import type { |
| 3 | ErrorHandler, |
| 4 | ExitHandler, |
| 5 | IWorker, |
| 6 | MessageHandler, |
| 7 | OnlineHandler, |
| 8 | WorkerNode |
| 9 | } from './worker' |
| 10 | import type { |
| 11 | WorkerChoiceStrategy, |
| 12 | WorkerChoiceStrategyOptions |
| 13 | } from './selection-strategies/selection-strategies-types' |
| 14 | |
| 15 | /** |
| 16 | * Pool types. |
| 17 | * |
| 18 | * @enum |
| 19 | * @internal |
| 20 | */ |
| 21 | export enum PoolType { |
| 22 | /** |
| 23 | * Fixed pool type. |
| 24 | */ |
| 25 | FIXED = 'fixed', |
| 26 | /** |
| 27 | * Dynamic pool type. |
| 28 | */ |
| 29 | DYNAMIC = 'dynamic' |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * Pool events emitter. |
| 34 | */ |
| 35 | export class PoolEmitter extends EventEmitter {} |
| 36 | |
| 37 | /** |
| 38 | * Enumeration of pool events. |
| 39 | */ |
| 40 | export const PoolEvents = Object.freeze({ |
| 41 | full: 'full', |
| 42 | busy: 'busy' |
| 43 | } as const) |
| 44 | |
| 45 | /** |
| 46 | * Pool event. |
| 47 | */ |
| 48 | export type PoolEvent = keyof typeof PoolEvents |
| 49 | |
| 50 | /** |
| 51 | * Worker tasks queue options. |
| 52 | */ |
| 53 | export interface TasksQueueOptions { |
| 54 | /** |
| 55 | * Maximum number of tasks that can be executed concurrently on a worker. |
| 56 | * |
| 57 | * @defaultValue 1 |
| 58 | */ |
| 59 | concurrency?: number |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Options for a poolifier pool. |
| 64 | * |
| 65 | * @typeParam Worker - Type of worker. |
| 66 | */ |
| 67 | export interface PoolOptions<Worker extends IWorker> { |
| 68 | /** |
| 69 | * A function that will listen for message event on each worker. |
| 70 | */ |
| 71 | messageHandler?: MessageHandler<Worker> |
| 72 | /** |
| 73 | * A function that will listen for error event on each worker. |
| 74 | */ |
| 75 | errorHandler?: ErrorHandler<Worker> |
| 76 | /** |
| 77 | * A function that will listen for online event on each worker. |
| 78 | */ |
| 79 | onlineHandler?: OnlineHandler<Worker> |
| 80 | /** |
| 81 | * A function that will listen for exit event on each worker. |
| 82 | */ |
| 83 | exitHandler?: ExitHandler<Worker> |
| 84 | /** |
| 85 | * The worker choice strategy to use in this pool. |
| 86 | */ |
| 87 | workerChoiceStrategy?: WorkerChoiceStrategy |
| 88 | /** |
| 89 | * The worker choice strategy options. |
| 90 | */ |
| 91 | workerChoiceStrategyOptions?: WorkerChoiceStrategyOptions |
| 92 | /** |
| 93 | * Pool events emission. |
| 94 | * |
| 95 | * @defaultValue true |
| 96 | */ |
| 97 | enableEvents?: boolean |
| 98 | /** |
| 99 | * Pool worker tasks queue. |
| 100 | * |
| 101 | * @experimental |
| 102 | * @defaultValue false |
| 103 | */ |
| 104 | enableTasksQueue?: boolean |
| 105 | /** |
| 106 | * Pool worker tasks queue options. |
| 107 | * |
| 108 | * @experimental |
| 109 | */ |
| 110 | tasksQueueOptions?: TasksQueueOptions |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Contract definition for a poolifier pool. |
| 115 | * |
| 116 | * @typeParam Worker - Type of worker which manages this pool. |
| 117 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. |
| 118 | * @typeParam Response - Type of execution response. This can only be serializable data. |
| 119 | */ |
| 120 | export interface IPool< |
| 121 | Worker extends IWorker, |
| 122 | Data = unknown, |
| 123 | Response = unknown |
| 124 | > { |
| 125 | /** |
| 126 | * Pool type. |
| 127 | * |
| 128 | * If it is `'dynamic'`, it provides the `max` property. |
| 129 | */ |
| 130 | readonly type: PoolType |
| 131 | /** |
| 132 | * Pool worker nodes. |
| 133 | */ |
| 134 | readonly workerNodes: Array<WorkerNode<Worker, Data>> |
| 135 | /** |
| 136 | * Emitter on which events can be listened to. |
| 137 | * |
| 138 | * Events that can currently be listened to: |
| 139 | * |
| 140 | * - `'full'`: Emitted when the pool is dynamic and full. |
| 141 | * - `'busy'`: Emitted when the pool is busy. |
| 142 | */ |
| 143 | readonly emitter?: PoolEmitter |
| 144 | /** |
| 145 | * Finds a free worker node key based on the number of tasks the worker has applied. |
| 146 | * |
| 147 | * If a worker is found with `0` running tasks, it is detected as free and its worker node key is returned. |
| 148 | * |
| 149 | * If no free worker is found, `-1` is returned. |
| 150 | * |
| 151 | * @returns A worker node key if there is one, `-1` otherwise. |
| 152 | */ |
| 153 | findFreeWorkerNodeKey: () => number |
| 154 | /** |
| 155 | * Performs the task specified in the constructor with the data parameter. |
| 156 | * |
| 157 | * @param data - The input for the specified task. This can only be serializable data. |
| 158 | * @returns Promise that will be resolved when the task is successfully completed. |
| 159 | */ |
| 160 | execute: (data: Data) => Promise<Response> |
| 161 | /** |
| 162 | * Shutdowns every current worker in this pool. |
| 163 | */ |
| 164 | destroy: () => Promise<void> |
| 165 | /** |
| 166 | * Sets the worker choice strategy in this pool. |
| 167 | * |
| 168 | * @param workerChoiceStrategy - The worker choice strategy. |
| 169 | */ |
| 170 | setWorkerChoiceStrategy: (workerChoiceStrategy: WorkerChoiceStrategy) => void |
| 171 | } |