X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fpools%2Fworker.ts;h=05f6606edde672db081d9f392e9584ebc7a917f7;hb=76ae94ffbe0d293daee778f0e885866242059450;hp=5b427a5620d93740d642625e30d69f2bfd3cba0a;hpb=7c8381eb33aaff689afe1944d8643508003cf0b1;p=poolifier.git

diff --git a/src/pools/worker.ts b/src/pools/worker.ts
index 5b427a56..05f6606e 100644
--- a/src/pools/worker.ts
+++ b/src/pools/worker.ts
@@ -1,7 +1,19 @@
-import type { CircularArray } from '../circular-array'
+import type { MessageChannel, WorkerOptions } from 'node:worker_threads'
+import type { EventEmitter } from 'node:events'
+import type { CircularArray } from '../circular-array.js'
+import type { Task } from '../utility-types.js'
+
+/**
+ * Callback invoked when the worker has started successfully.
+ *
+ * @typeParam Worker - Type of worker.
+ */
+export type OnlineHandler<Worker extends IWorker> = (this: Worker) => void
 
 /**
  * Callback invoked if the worker has received a message.
+ *
+ * @typeParam Worker - Type of worker.
  */
 export type MessageHandler<Worker extends IWorker> = (
   this: Worker,
@@ -10,19 +22,18 @@ export type MessageHandler<Worker extends IWorker> = (
 
 /**
  * Callback invoked if the worker raised an error.
+ *
+ * @typeParam Worker - Type of worker.
  */
 export type ErrorHandler<Worker extends IWorker> = (
   this: Worker,
   error: Error
 ) => void
 
-/**
- * Callback invoked when the worker has started successfully.
- */
-export type OnlineHandler<Worker extends IWorker> = (this: Worker) => void
-
 /**
  * Callback invoked when the worker exits successfully.
+ *
+ * @typeParam Worker - Type of worker.
  */
 export type ExitHandler<Worker extends IWorker> = (
   this: Worker,
@@ -30,29 +41,15 @@ export type ExitHandler<Worker extends IWorker> = (
 ) => void
 
 /**
- * Message object that is passed as a task between main worker and worker.
+ * Worker event handler.
  *
- * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
- * @internal
+ * @typeParam Worker - Type of worker.
  */
-export interface Task<Data = unknown> {
-  /**
-   * Task name.
-   */
-  readonly name?: string
-  /**
-   * Task input data that will be passed to the worker.
-   */
-  readonly data?: Data
-  /**
-   * Timestamp.
-   */
-  readonly timestamp?: number
-  /**
-   * Message UUID.
-   */
-  readonly id?: string
-}
+export type EventHandler<Worker extends IWorker> =
+  | OnlineHandler<Worker>
+  | MessageHandler<Worker>
+  | ErrorHandler<Worker>
+  | ExitHandler<Worker>
 
 /**
  * Measurement statistics.
@@ -118,7 +115,15 @@ export interface TaskStatistics {
   /**
    * Maximum number of queued tasks.
    */
-  readonly maxQueued: number
+  readonly maxQueued?: number
+  /**
+   * Number of sequentially stolen tasks.
+   */
+  sequentiallyStolen: number
+  /**
+   * Number of stolen tasks.
+   */
+  stolen: number
   /**
    * Number of failed tasks.
    */
@@ -129,8 +134,8 @@ export interface TaskStatistics {
  * Enumeration of worker types.
  */
 export const WorkerTypes = Object.freeze({
-  cluster: 'cluster',
-  thread: 'thread'
+  thread: 'thread',
+  cluster: 'cluster'
 } as const)
 
 /**
@@ -151,7 +156,7 @@ export interface WorkerInfo {
   /**
    * Worker type.
    */
-  type: WorkerType
+  readonly type: WorkerType
   /**
    * Dynamic flag.
    */
@@ -160,6 +165,15 @@ export interface WorkerInfo {
    * Ready flag.
    */
   ready: boolean
+  /**
+   * Stealing flag.
+   * This flag is set to `true` when worker node is stealing tasks from another worker node.
+   */
+  stealing: boolean
+  /**
+   * Task function names.
+   */
+  taskFunctionNames?: string[]
 }
 
 /**
@@ -186,32 +200,65 @@ export interface WorkerUsage {
   readonly elu: EventLoopUtilizationMeasurementStatistics
 }
 
+/**
+ * Worker choice strategy data.
+ *
+ * @internal
+ */
+export interface StrategyData {
+  virtualTaskEndTimestamp?: number
+}
+
 /**
  * Worker interface.
  */
-export interface IWorker {
+export interface IWorker extends EventEmitter {
   /**
-   * Worker id.
+   * Cluster worker id.
    */
   readonly id?: number
+  /**
+   * Worker thread worker id.
+   */
   readonly threadId?: number
   /**
-   * Registers an event listener.
+   * Registers an event handler.
    *
    * @param event - The event.
    * @param handler - The event handler.
    */
-  readonly on: ((event: 'message', handler: MessageHandler<this>) => void) &
-  ((event: 'error', handler: ErrorHandler<this>) => void) &
-  ((event: 'online', handler: OnlineHandler<this>) => void) &
-  ((event: 'exit', handler: ExitHandler<this>) => void)
+  readonly on: (event: string, handler: EventHandler<this>) => this
   /**
-   * Registers a listener to the exit event that will only be performed once.
+   * Registers once an event handler.
    *
-   * @param event - `'exit'`.
-   * @param handler - The exit handler.
+   * @param event - The event.
+   * @param handler - The event handler.
+   */
+  readonly once: (event: string, handler: EventHandler<this>) => this
+  /**
+   * Stop all JavaScript execution in the worker thread as soon as possible.
+   * Returns a Promise for the exit code that is fulfilled when the `'exit' event` is emitted.
    */
-  readonly once: (event: 'exit', handler: ExitHandler<this>) => void
+  readonly terminate?: () => Promise<number>
+  /**
+   * Cluster worker disconnect.
+   */
+  readonly disconnect?: () => void
+  /**
+   * Cluster worker kill.
+   */
+  readonly kill?: (signal?: string) => void
+}
+
+/**
+ * Worker node options.
+ *
+ * @internal
+ */
+export interface WorkerNodeOptions {
+  workerOptions?: WorkerOptions
+  env?: Record<string, unknown>
+  tasksQueueBackPressureSize: number | undefined
 }
 
 /**
@@ -221,44 +268,126 @@ export interface IWorker {
  * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
  * @internal
  */
-export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
+export interface IWorkerNode<Worker extends IWorker, Data = unknown>
+  extends EventEmitter {
   /**
-   * Worker node worker.
+   * Worker.
    */
   readonly worker: Worker
   /**
-   * Worker node worker info.
+   * Worker info.
    */
   readonly info: WorkerInfo
   /**
-   * Worker node worker usage statistics.
+   * Worker usage statistics.
+   */
+  readonly usage: WorkerUsage
+  /**
+   * Worker choice strategy data.
+   * This is used to store data that are specific to the worker choice strategy.
+   */
+  strategyData?: StrategyData
+  /**
+   * Message channel (worker thread only).
+   */
+  readonly messageChannel?: MessageChannel
+  /**
+   * Tasks queue back pressure size.
+   * This is the number of tasks that can be enqueued before the worker node has back pressure.
    */
-  usage: WorkerUsage
+  tasksQueueBackPressureSize: number
   /**
-   * Worker node tasks queue size.
+   * Tasks queue size.
    *
    * @returns The tasks queue size.
    */
   readonly tasksQueueSize: () => number
   /**
-   * Worker node enqueue task.
+   * Enqueue task.
    *
    * @param task - The task to queue.
-   * @returns The task queue size.
+   * @returns The tasks queue size.
    */
   readonly enqueueTask: (task: Task<Data>) => number
   /**
-   * Worker node dequeue task.
+   * Prepends a task to the tasks queue.
+   *
+   * @param task - The task to prepend.
+   * @returns The tasks queue size.
+   */
+  readonly unshiftTask: (task: Task<Data>) => number
+  /**
+   * Dequeue task.
    *
    * @returns The dequeued task.
    */
   readonly dequeueTask: () => Task<Data> | undefined
   /**
-   * Worker node clear tasks queue.
+   * Pops a task from the tasks queue.
+   *
+   * @returns The popped task.
+   */
+  readonly popTask: () => Task<Data> | undefined
+  /**
+   * Clears tasks queue.
    */
   readonly clearTasksQueue: () => void
   /**
-   * Worker node reset usage statistics .
+   * Whether the worker node has back pressure (i.e. its tasks queue is full).
+   *
+   * @returns `true` if the worker node has back pressure, `false` otherwise.
+   */
+  readonly hasBackPressure: () => boolean
+  /**
+   * Resets usage statistics.
    */
   readonly resetUsage: () => void
+  /**
+   * Terminates the worker node.
+   */
+  readonly terminate: () => Promise<void>
+  /**
+   * Registers a worker event handler.
+   *
+   * @param event - The event.
+   * @param handler - The event handler.
+   */
+  readonly registerWorkerEventHandler: (
+    event: string,
+    handler: EventHandler<Worker>
+  ) => void
+  /**
+   * Registers once a worker event handler.
+   *
+   * @param event - The event.
+   * @param handler - The event handler.
+   */
+  readonly registerOnceWorkerEventHandler: (
+    event: string,
+    handler: EventHandler<Worker>
+  ) => void
+  /**
+   * Gets task function worker usage statistics.
+   *
+   * @param name - The task function name.
+   * @returns The task function worker usage statistics if the task function worker usage statistics are initialized, `undefined` otherwise.
+   */
+  readonly getTaskFunctionWorkerUsage: (name: string) => WorkerUsage | undefined
+  /**
+   * Deletes task function worker usage statistics.
+   *
+   * @param name - The task function name.
+   * @returns `true` if the task function worker usage statistics were deleted, `false` otherwise.
+   */
+  readonly deleteTaskFunctionWorkerUsage: (name: string) => boolean
+}
+
+/**
+ * Worker node event detail.
+ *
+ * @internal
+ */
+export interface WorkerNodeEventDetail {
+  workerId?: number
+  workerNodeKey?: number
 }