import { EventEmitter } from 'node:events'
import { type TransferListItem } from 'node:worker_threads'
+import type { TaskFunction } from '../worker/task-functions'
import type {
ErrorHandler,
ExitHandler,
readonly version: string
readonly type: PoolType
readonly worker: WorkerType
+ readonly started: boolean
readonly ready: boolean
readonly strategy: WorkerChoiceStrategy
readonly minSize: number
readonly executingTasks: number
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
}
}
/**
- * Worker tasks queue options.
+ * Worker node tasks queue options.
*/
export interface TasksQueueOptions {
/**
- * Maximum number of tasks that can be executed concurrently on a worker.
+ * Maximum tasks queue size per worker node flagging it as back pressured.
+ *
+ * @defaultValue (pool maximum size)^2
+ */
+ readonly size?: number
+ /**
+ * Maximum number of tasks that can be executed concurrently on a worker node.
*
* @defaultValue 1
*/
readonly concurrency?: number
+ /**
+ * Whether to enable task stealing.
+ *
+ * @defaultValue true
+ */
+ readonly taskStealing?: boolean
+ /**
+ * Whether to enable tasks stealing on back pressure.
+ *
+ * @defaultValue true
+ */
+ readonly tasksStealingOnBackPressure?: boolean
}
/**
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>
+ /**
+ * Whether to start the minimum number of workers at pool initialization.
+ *
+ * @defaultValue true
+ */
+ startWorkers?: boolean
/**
* The worker choice strategy to use in this pool.
*
*/
enableEvents?: boolean
/**
- * Pool worker tasks queue.
+ * Pool worker node tasks queue.
*
* @defaultValue false
*/
enableTasksQueue?: boolean
/**
- * Pool worker tasks queue options.
+ * Pool worker node tasks queue options.
*/
tasksQueueOptions?: TasksQueueOptions
}
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
/**
* Emitter on which events can be listened to.
*
* 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.
+ * - `'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.
+ * - `'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 a worker node has back pressure (i.e. its tasks queue is full).
+ * - `'backPressure'`: Emitted when all worker nodes have back pressure (i.e. their tasks queue is full: queue size \>= maximum queue size).
*/
readonly emitter?: PoolEmitter
/**
name?: string,
transferList?: 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>
+ /**
+ * 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 hasTaskFunction: (name: string) => boolean
+ /**
+ * 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.
+ */
+ readonly addTaskFunction: (
+ name: string,
+ fn: TaskFunction<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 names of task function available in this pool.
*
* @returns The names of task function available in this pool.
*/
- readonly listTaskFunctions: () => string[]
+ readonly listTaskFunctionNames: () => string[]
+ /**
+ * 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 worker choice strategy in this pool.
*
workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
) => void
/**
- * Enables/disables the worker tasks queue in this pool.
+ * Enables/disables the worker node tasks queue in this pool.
*
- * @param enable - Whether to enable or disable the worker tasks queue.
- * @param tasksQueueOptions - The worker tasks queue options.
+ * @param enable - Whether to enable or disable the worker node tasks queue.
+ * @param tasksQueueOptions - The worker node tasks queue options.
*/
readonly enableTasksQueue: (
enable: boolean,
tasksQueueOptions?: TasksQueueOptions
) => void
/**
- * Sets the worker tasks queue options in this pool.
+ * Sets the worker node tasks queue options in this pool.
*
- * @param tasksQueueOptions - The worker tasks queue options.
+ * @param tasksQueueOptions - The worker node tasks queue options.
*/
readonly setTasksQueueOptions: (tasksQueueOptions: TasksQueueOptions) => void
}
repositories / poolifier.git / blobdiff