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9e45c2c4 | 1 | import EventEmitterAsyncResource from 'node:events' |
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2 | import type { |
3 | ErrorHandler, | |
4 | ExitHandler, | |
50e66724 | 5 | IWorker, |
bdaf31cd | 6 | MessageHandler, |
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7 | OnlineHandler, |
8 | WorkerNode | |
f06e48d8 | 9 | } from './worker' |
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10 | import type { |
11 | WorkerChoiceStrategy, | |
12 | WorkerChoiceStrategyOptions | |
13 | } from './selection-strategies/selection-strategies-types' | |
bdaf31cd | 14 | |
c4855468 | 15 | /** |
6b27d407 | 16 | * Enumeration of pool types. |
c4855468 | 17 | */ |
6b27d407 | 18 | export const PoolTypes = Object.freeze({ |
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19 | /** |
20 | * Fixed pool type. | |
21 | */ | |
6b27d407 | 22 | fixed: 'fixed', |
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23 | /** |
24 | * Dynamic pool type. | |
25 | */ | |
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26 | dynamic: 'dynamic' |
27 | } as const) | |
28 | ||
29 | /** | |
30 | * Pool type. | |
31 | */ | |
32 | export type PoolType = keyof typeof PoolTypes | |
c4855468 | 33 | |
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34 | /** |
35 | * Enumeration of worker types. | |
36 | */ | |
37 | export const WorkerTypes = Object.freeze({ | |
38 | cluster: 'cluster', | |
39 | thread: 'thread' | |
40 | } as const) | |
41 | ||
42 | /** | |
43 | * Worker type. | |
44 | */ | |
45 | export type WorkerType = keyof typeof WorkerTypes | |
46 | ||
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47 | /** |
48 | * Pool events emitter. | |
49 | */ | |
9e45c2c4 | 50 | export class PoolEmitter extends EventEmitterAsyncResource {} |
b4904890 | 51 | |
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52 | /** |
53 | * Enumeration of pool events. | |
54 | */ | |
55 | export const PoolEvents = Object.freeze({ | |
56 | full: 'full', | |
1f68cede | 57 | busy: 'busy', |
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58 | error: 'error', |
59 | taskError: 'taskError' | |
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60 | } as const) |
61 | ||
62 | /** | |
63 | * Pool event. | |
64 | */ | |
65 | export type PoolEvent = keyof typeof PoolEvents | |
66 | ||
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67 | /** |
68 | * Pool information. | |
69 | */ | |
70 | export interface PoolInfo { | |
71 | type: PoolType | |
184855e6 | 72 | worker: WorkerType |
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73 | minSize: number |
74 | maxSize: number | |
64383951 | 75 | /** Pool utilization ratio. */ |
afe0d5bf | 76 | utilization: number |
64383951 | 77 | /** Pool total worker nodes */ |
6b27d407 | 78 | workerNodes: number |
64383951 | 79 | /** Pool idle worker nodes */ |
6b27d407 | 80 | idleWorkerNodes: number |
64383951 | 81 | /** Pool busy worker nodes */ |
6b27d407 | 82 | busyWorkerNodes: number |
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83 | executedTasks: number |
84 | executingTasks: number | |
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85 | queuedTasks: number |
86 | maxQueuedTasks: number | |
a4e07f72 | 87 | failedTasks: number |
6b27d407 JB |
88 | } |
89 | ||
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90 | /** |
91 | * Worker tasks queue options. | |
92 | */ | |
93 | export interface TasksQueueOptions { | |
94 | /** | |
95 | * Maximum number of tasks that can be executed concurrently on a worker. | |
96 | * | |
97 | * @defaultValue 1 | |
98 | */ | |
eb7bf744 | 99 | readonly concurrency?: number |
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100 | } |
101 | ||
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102 | /** |
103 | * Options for a poolifier pool. | |
c319c66b | 104 | * |
d480d708 | 105 | * @typeParam Worker - Type of worker. |
bdaf31cd | 106 | */ |
50e66724 | 107 | export interface PoolOptions<Worker extends IWorker> { |
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108 | /** |
109 | * A function that will listen for message event on each worker. | |
110 | */ | |
111 | messageHandler?: MessageHandler<Worker> | |
112 | /** | |
113 | * A function that will listen for error event on each worker. | |
114 | */ | |
115 | errorHandler?: ErrorHandler<Worker> | |
116 | /** | |
117 | * A function that will listen for online event on each worker. | |
118 | */ | |
119 | onlineHandler?: OnlineHandler<Worker> | |
120 | /** | |
121 | * A function that will listen for exit event on each worker. | |
122 | */ | |
123 | exitHandler?: ExitHandler<Worker> | |
124 | /** | |
46e857ca | 125 | * The worker choice strategy to use in this pool. |
d29bce7c | 126 | * |
95ec6006 | 127 | * @defaultValue WorkerChoiceStrategies.ROUND_ROBIN |
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128 | */ |
129 | workerChoiceStrategy?: WorkerChoiceStrategy | |
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130 | /** |
131 | * The worker choice strategy options. | |
132 | */ | |
133 | workerChoiceStrategyOptions?: WorkerChoiceStrategyOptions | |
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134 | /** |
135 | * Restart worker on error. | |
136 | */ | |
137 | restartWorkerOnError?: boolean | |
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138 | /** |
139 | * Pool events emission. | |
140 | * | |
38e795c1 | 141 | * @defaultValue true |
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142 | */ |
143 | enableEvents?: boolean | |
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144 | /** |
145 | * Pool worker tasks queue. | |
146 | * | |
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147 | * @defaultValue false |
148 | */ | |
149 | enableTasksQueue?: boolean | |
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150 | /** |
151 | * Pool worker tasks queue options. | |
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152 | */ |
153 | tasksQueueOptions?: TasksQueueOptions | |
bdaf31cd | 154 | } |
a35560ba | 155 | |
729c563d S |
156 | /** |
157 | * Contract definition for a poolifier pool. | |
158 | * | |
c4855468 | 159 | * @typeParam Worker - Type of worker which manages this pool. |
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160 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
161 | * @typeParam Response - Type of execution response. This can only be structured-cloneable data. | |
729c563d | 162 | */ |
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163 | export interface IPool< |
164 | Worker extends IWorker, | |
165 | Data = unknown, | |
166 | Response = unknown | |
167 | > { | |
08f3f44c | 168 | /** |
6b27d407 | 169 | * Pool information. |
08f3f44c | 170 | */ |
6b27d407 | 171 | readonly info: PoolInfo |
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172 | /** |
173 | * Pool worker nodes. | |
174 | */ | |
175 | readonly workerNodes: Array<WorkerNode<Worker, Data>> | |
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176 | /** |
177 | * Emitter on which events can be listened to. | |
178 | * | |
179 | * Events that can currently be listened to: | |
180 | * | |
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181 | * - `'full'`: Emitted when the pool is dynamic and full. |
182 | * - `'busy'`: Emitted when the pool is busy. | |
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183 | * - `'error'`: Emitted when an uncaught error occurs. |
184 | * - `'taskError'`: Emitted when an error occurs while executing a task. | |
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185 | */ |
186 | readonly emitter?: PoolEmitter | |
729c563d | 187 | /** |
61aa11a6 | 188 | * Executes the specified function in the worker constructor with the task data input parameter. |
729c563d | 189 | * |
e102732c | 190 | * @param data - The task input data for the specified worker function. This can only be structured-cloneable data. |
a86b6df1 | 191 | * @param name - The name of the worker function to execute. If not specified, the default worker function will be executed. |
ef41a6e6 | 192 | * @returns Promise that will be fulfilled when the task is completed. |
729c563d | 193 | */ |
a86b6df1 | 194 | execute: (data?: Data, name?: string) => Promise<Response> |
280c2a77 | 195 | /** |
64383951 | 196 | * Terminates every current worker in this pool. |
280c2a77 | 197 | */ |
78cea37e | 198 | destroy: () => Promise<void> |
a35560ba | 199 | /** |
bdede008 | 200 | * Sets the worker choice strategy in this pool. |
a35560ba | 201 | * |
38e795c1 | 202 | * @param workerChoiceStrategy - The worker choice strategy. |
59219cbb | 203 | * @param workerChoiceStrategyOptions - The worker choice strategy options. |
a35560ba | 204 | */ |
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205 | setWorkerChoiceStrategy: ( |
206 | workerChoiceStrategy: WorkerChoiceStrategy, | |
207 | workerChoiceStrategyOptions?: WorkerChoiceStrategyOptions | |
208 | ) => void | |
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209 | /** |
210 | * Sets the worker choice strategy options in this pool. | |
211 | * | |
212 | * @param workerChoiceStrategyOptions - The worker choice strategy options. | |
213 | */ | |
214 | setWorkerChoiceStrategyOptions: ( | |
215 | workerChoiceStrategyOptions: WorkerChoiceStrategyOptions | |
216 | ) => void | |
217 | /** | |
218 | * Enables/disables the worker tasks queue in this pool. | |
219 | * | |
220 | * @param enable - Whether to enable or disable the worker tasks queue. | |
221 | * @param tasksQueueOptions - The worker tasks queue options. | |
222 | */ | |
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223 | enableTasksQueue: ( |
224 | enable: boolean, | |
225 | tasksQueueOptions?: TasksQueueOptions | |
226 | ) => void | |
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227 | /** |
228 | * Sets the worker tasks queue options in this pool. | |
229 | * | |
230 | * @param tasksQueueOptions - The worker tasks queue options. | |
231 | */ | |
232 | setTasksQueueOptions: (tasksQueueOptions: TasksQueueOptions) => void | |
c97c7edb | 233 | } |