-import { EventEmitter } from 'node:events'
-import { type TransferListItem } from 'node:worker_threads'
+import type { ClusterSettings } from 'node:cluster'
+import type { EventEmitterAsyncResource } from 'node:events'
+import type { TransferListItem, WorkerOptions } from 'node:worker_threads'
+
+import type { TaskFunctionProperties } from '../utility-types.js'
+import type {
+ TaskFunction,
+ TaskFunctionObject,
+} from '../worker/task-functions.js'
+import type {
+ WorkerChoiceStrategy,
+ WorkerChoiceStrategyOptions,
+} from './selection-strategies/selection-strategies-types.js'
import type {
ErrorHandler,
ExitHandler,
IWorkerNode,
MessageHandler,
OnlineHandler,
- WorkerType
-} from './worker'
-import type {
- WorkerChoiceStrategy,
- WorkerChoiceStrategyOptions
-} from './selection-strategies/selection-strategies-types'
+ WorkerType,
+} from './worker.js'
/**
* Enumeration of pool types.
*/
-export const PoolTypes = Object.freeze({
+export const PoolTypes: Readonly<{
+ fixed: 'fixed'
+ dynamic: 'dynamic'
+}> = Object.freeze({
/**
* Fixed pool type.
*/
/**
* Dynamic pool type.
*/
- dynamic: 'dynamic'
+ dynamic: 'dynamic',
} as const)
/**
*/
export type PoolType = keyof typeof PoolTypes
-/**
- * Pool events emitter.
- */
-export class PoolEmitter extends EventEmitter {}
-
/**
* Enumeration of pool events.
*/
-export const PoolEvents = Object.freeze({
+export const PoolEvents: Readonly<{
+ ready: 'ready'
+ busy: 'busy'
+ full: 'full'
+ empty: 'empty'
+ destroy: 'destroy'
+ error: 'error'
+ taskError: 'taskError'
+ backPressure: 'backPressure'
+}> = Object.freeze({
ready: 'ready',
busy: 'busy',
full: 'full',
+ empty: 'empty',
destroy: 'destroy',
error: 'error',
taskError: 'taskError',
- backPressure: 'backPressure'
+ backPressure: 'backPressure',
} as const)
/**
readonly version: string
readonly type: PoolType
readonly worker: WorkerType
+ readonly started: boolean
readonly ready: boolean
- readonly strategy: WorkerChoiceStrategy
+ readonly defaultStrategy: WorkerChoiceStrategy
+ readonly strategyRetries: number
readonly minSize: number
readonly maxSize: number
/** Pool utilization. */
readonly utilization?: number
/** Pool total worker nodes. */
readonly workerNodes: number
+ /** Pool stealing worker nodes. */
+ readonly stealingWorkerNodes?: number
/** Pool idle worker nodes. */
readonly idleWorkerNodes: number
/** Pool busy worker nodes. */
readonly queuedTasks?: number
readonly maxQueuedTasks?: number
readonly backPressure?: boolean
+ readonly stolenTasks?: number
readonly failedTasks: number
readonly runTime?: {
readonly minimum: number
readonly maximum: number
- readonly average: number
+ readonly average?: number
readonly median?: number
}
readonly waitTime?: {
readonly minimum: number
readonly maximum: number
- readonly average: number
+ readonly average?: number
readonly median?: number
}
+ readonly elu?: {
+ idle: {
+ readonly minimum: number
+ readonly maximum: number
+ readonly average?: number
+ readonly median?: number
+ }
+ active: {
+ readonly minimum: number
+ readonly maximum: number
+ readonly average?: number
+ readonly median?: number
+ }
+ utilization: {
+ readonly average?: number
+ readonly median?: number
+ }
+ }
}
/**
export interface TasksQueueOptions {
/**
* Maximum tasks queue size per worker node flagging it as back pressured.
- *
* @defaultValue (pool maximum size)^2
*/
readonly size?: number
- /**
- * @deprecated Use `size` instead.
- */
- readonly queueMaxSize?: number
/**
* Maximum number of tasks that can be executed concurrently on a worker node.
- *
* @defaultValue 1
*/
readonly concurrency?: number
+ /**
+ * Whether to enable task stealing on idle.
+ * @defaultValue true
+ */
+ readonly taskStealing?: boolean
+ /**
+ * Whether to enable tasks stealing under back pressure.
+ * @defaultValue false
+ */
+ readonly tasksStealingOnBackPressure?: boolean
+ /**
+ * Queued tasks finished timeout in milliseconds at worker node termination.
+ * @defaultValue 2000
+ */
+ readonly tasksFinishedTimeout?: number
}
/**
* Options for a poolifier pool.
- *
* @typeParam Worker - Type of worker.
*/
export interface PoolOptions<Worker extends IWorker> {
/**
* A function that will listen for online event on each worker.
+ * @defaultValue `() => {}`
*/
onlineHandler?: OnlineHandler<Worker>
/**
* A function that will listen for message event on each worker.
+ * @defaultValue `() => {}`
*/
messageHandler?: MessageHandler<Worker>
/**
* A function that will listen for error event on each worker.
+ * @defaultValue `() => {}`
*/
errorHandler?: ErrorHandler<Worker>
/**
* A function that will listen for exit event on each worker.
+ * @defaultValue `() => {}`
*/
exitHandler?: ExitHandler<Worker>
/**
- * The worker choice strategy to use in this pool.
- *
+ * Whether to start the minimum number of workers at pool initialization.
+ * @defaultValue true
+ */
+ startWorkers?: boolean
+ /**
+ * The default worker choice strategy to use in this pool.
* @defaultValue WorkerChoiceStrategies.ROUND_ROBIN
*/
workerChoiceStrategy?: WorkerChoiceStrategy
*/
restartWorkerOnError?: boolean
/**
- * Pool events emission.
- *
+ * Pool events integrated with async resource emission.
* @defaultValue true
*/
enableEvents?: boolean
/**
* Pool worker node tasks queue.
- *
* @defaultValue false
*/
enableTasksQueue?: boolean
* Pool worker node tasks queue options.
*/
tasksQueueOptions?: TasksQueueOptions
+ /**
+ * Worker options.
+ * @see https://nodejs.org/api/worker_threads.html#new-workerfilename-options
+ */
+ workerOptions?: WorkerOptions
+ /**
+ * Key/value pairs to add to worker process environment.
+ * @see https://nodejs.org/api/cluster.html#cluster_cluster_fork_env
+ */
+ env?: Record<string, unknown>
+ /**
+ * Cluster settings.
+ * @see https://nodejs.org/api/cluster.html#cluster_cluster_settings
+ */
+ settings?: ClusterSettings
}
/**
* Contract definition for a poolifier pool.
- *
* @typeParam Worker - Type of worker which manages this pool.
* @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
* @typeParam Response - Type of execution response. This can only be structured-cloneable data.
readonly info: PoolInfo
/**
* Pool worker nodes.
- *
- * @internal
- */
- readonly workerNodes: Array<IWorkerNode<Worker, Data>>
- /**
- * Whether the worker node has back pressure (i.e. its tasks queue is full).
- *
- * @param workerNodeKey - The worker node key.
- * @returns `true` if the worker node has back pressure, `false` otherwise.
* @internal
*/
- readonly hasWorkerNodeBackPressure: (workerNodeKey: number) => boolean
+ readonly workerNodes: IWorkerNode<Worker, Data>[]
/**
- * Emitter on which events can be listened to.
+ * Pool event emitter integrated with async resource.
+ * The async tracking tooling identifier is `poolifier:<PoolType>-<WorkerType>-pool`.
*
* Events that can currently be listened to:
*
- * - `'ready'`: Emitted when the number of workers created in the pool has reached the minimum size expected and are ready.
- * - `'busy'`: Emitted when the number of workers created in the pool has reached the maximum size expected and are executing at least one task.
+ * - `'ready'`: Emitted when the number of workers created in the pool has reached the minimum size expected and are ready. If the pool is dynamic with a minimum number of workers is set to zero, this event is emitted when at least one dynamic worker is ready.
+ * - `'busy'`: Emitted when the number of workers created in the pool has reached the maximum size expected and are executing concurrently their tasks quota.
* - `'full'`: Emitted when the pool is dynamic and the number of workers created has reached the maximum size expected.
- * - '`destroy`': Emitted when the pool is destroyed.
+ * - `'empty'`: Emitted when the pool is dynamic with a minimum number of workers set to zero and the number of workers has reached the minimum size expected.
+ * - `'destroy'`: Emitted when the pool is destroyed.
* - `'error'`: Emitted when an uncaught error occurs.
* - `'taskError'`: Emitted when an error occurs while executing a task.
* - `'backPressure'`: Emitted when all worker nodes have back pressure (i.e. their tasks queue is full: queue size \>= maximum queue size).
*/
- readonly emitter?: PoolEmitter
+ readonly emitter?: EventEmitterAsyncResource
/**
* Executes the specified function in the worker constructor with the task data input parameter.
- *
* @param data - The optional task input data for the specified task function. This can only be structured-cloneable data.
* @param name - The optional name of the task function to execute. If not specified, the default task function will be executed.
- * @param transferList - An optional array of transferable objects to transfer ownership of. Ownership of the transferred objects is given to the pool's worker_threads worker and they should not be used in the main thread afterwards.
- * @returns Promise that will be fulfilled when the task is completed.
+ * @param transferList - An optional array of transferable objects to transfer ownership of. Ownership of the transferred objects is given to the chosen pool's worker_threads worker and they should not be used in the main thread afterwards.
+ * @returns Promise with a task function response that will be fulfilled when the task is completed.
*/
readonly execute: (
data?: Data,
name?: string,
- transferList?: TransferListItem[]
+ transferList?: readonly TransferListItem[]
) => Promise<Response>
+ /**
+ * Executes the specified function in the worker constructor with the tasks data iterable input parameter.
+ * @param data - The tasks iterable input data for the specified task function. This can only be an iterable of structured-cloneable data.
+ * @param name - The optional name of the task function to execute. If not specified, the default task function will be executed.
+ * @param transferList - An optional array of transferable objects to transfer ownership of. Ownership of the transferred objects is given to the chosen pool's worker_threads worker and they should not be used in the main thread afterwards.
+ * @returns Promise with an array of task function responses that will be fulfilled when the tasks are completed.
+ */
+ readonly mapExecute: (
+ data: Iterable<Data>,
+ name?: string,
+ transferList?: readonly TransferListItem[]
+ ) => Promise<Response[]>
+ /**
+ * Starts the minimum number of workers in this pool.
+ */
+ readonly start: () => void
/**
* Terminates all workers in this pool.
*/
readonly destroy: () => Promise<void>
/**
- * Lists the names of task function available in this pool.
- *
- * @returns The names of task function available in this pool.
+ * Whether the specified task function exists in this pool.
+ * @param name - The name of the task function.
+ * @returns `true` if the task function exists, `false` otherwise.
*/
- readonly listTaskFunctions: () => string[]
+ readonly hasTaskFunction: (name: string) => boolean
/**
- * Sets the worker choice strategy in this pool.
- *
- * @param workerChoiceStrategy - The worker choice strategy.
+ * Adds a task function to this pool.
+ * If a task function with the same name already exists, it will be overwritten.
+ * @param name - The name of the task function.
+ * @param fn - The task function.
+ * @returns `true` if the task function was added, `false` otherwise.
+ * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `name` parameter is not a string or an empty string.
+ * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `fn` parameter is not a function or task function object.
+ */
+ readonly addTaskFunction: (
+ name: string,
+ fn: TaskFunction<Data, Response> | TaskFunctionObject<Data, Response>
+ ) => Promise<boolean>
+ /**
+ * Removes a task function from this pool.
+ * @param name - The name of the task function.
+ * @returns `true` if the task function was removed, `false` otherwise.
+ */
+ readonly removeTaskFunction: (name: string) => Promise<boolean>
+ /**
+ * Lists the properties of task functions available in this pool.
+ * @returns The properties of task functions available in this pool.
+ */
+ readonly listTaskFunctionsProperties: () => TaskFunctionProperties[]
+ /**
+ * Sets the default task function in this pool.
+ * @param name - The name of the task function.
+ * @returns `true` if the default task function was set, `false` otherwise.
+ */
+ readonly setDefaultTaskFunction: (name: string) => Promise<boolean>
+ /**
+ * Sets the default worker choice strategy in this pool.
+ * @param workerChoiceStrategy - The default worker choice strategy.
* @param workerChoiceStrategyOptions - The worker choice strategy options.
*/
readonly setWorkerChoiceStrategy: (
) => void
/**
* Sets the worker choice strategy options in this pool.
- *
* @param workerChoiceStrategyOptions - The worker choice strategy options.
+ * @returns `true` if the worker choice strategy options were set, `false` otherwise.
*/
readonly setWorkerChoiceStrategyOptions: (
workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
- ) => void
+ ) => boolean
/**
* Enables/disables the worker node tasks queue in this pool.
- *
* @param enable - Whether to enable or disable the worker node tasks queue.
* @param tasksQueueOptions - The worker node tasks queue options.
*/
) => void
/**
* Sets the worker node tasks queue options in this pool.
- *
* @param tasksQueueOptions - The worker node tasks queue options.
*/
readonly setTasksQueueOptions: (tasksQueueOptions: TasksQueueOptions) => void