fix: fix possible null exception with worker_threads pools

[poolifier.git] / src / pools / worker.ts

diff --git a/src/pools/worker.ts b/src/pools/worker.ts
index bfd73325c3204d48c656924367500b9f30efbc1d..5439606d420f0abd165b84c49157808de230aee6 100644 (file)
--- a/src/pools/worker.ts
+++ b/src/pools/worker.ts
@@ -1,14 +1,19 @@
 import type { MessageChannel } from 'node:worker_threads'
+import type { EventEmitter } from 'node:events'
 import type { CircularArray } from '../circular-array'
 import type { Task } from '../utility-types'
 
 /**
  * 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,
@@ -17,6 +22,8 @@ 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,
@@ -25,6 +32,8 @@ export type ErrorHandler<Worker extends IWorker> = (
 
 /**
  * Callback invoked when the worker exits successfully.
+ *
+ * @typeParam Worker - Type of worker.
  */
 export type ExitHandler<Worker extends IWorker> = (
   this: Worker,
@@ -96,6 +105,10 @@ export interface TaskStatistics {
    * Maximum number of queued tasks.
    */
   readonly maxQueued?: number
+  /**
+   * Number of sequentially stolen tasks.
+   */
+  sequentiallyStolen: number
   /**
    * Number of stolen tasks.
    */
@@ -132,7 +145,7 @@ export interface WorkerInfo {
   /**
    * Worker type.
    */
-  type: WorkerType
+  readonly type: WorkerType
   /**
    * Dynamic flag.
    */
@@ -144,7 +157,7 @@ export interface WorkerInfo {
   /**
    * Task function names.
    */
-  taskFunctions?: string[]
+  taskFunctionNames?: string[]
 }
 
 /**
@@ -171,6 +184,15 @@ export interface WorkerUsage {
   readonly elu: EventLoopUtilizationMeasurementStatistics
 }
 
+/**
+ * Worker choice strategy data.
+ *
+ * @internal
+ */
+export interface StrategyData {
+  virtualTaskEndTimestamp?: number
+}
+
 /**
  * Worker interface.
  */
@@ -199,6 +221,16 @@ export interface IWorker {
   readonly once: (event: 'exit', handler: ExitHandler<this>) => void
 }
 
+/**
+ * Worker node event detail.
+ *
+ * @internal
+ */
+export interface WorkerNodeEventDetail {
+  workerId: number
+  workerNodeKey?: number
+}
+
 /**
  * Worker node interface.
  *
@@ -206,7 +238,8 @@ 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.
    */
@@ -218,7 +251,12 @@ export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
   /**
    * Worker usage statistics.
    */
-  usage: WorkerUsage
+  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_threads only).
    */
@@ -228,18 +266,6 @@ export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
    * This is the number of tasks that can be enqueued before the worker node has back pressure.
    */
   tasksQueueBackPressureSize: number
-  /**
-   * Callback invoked when worker node tasks queue is back pressured.
-   *
-   * @param workerId - The worker id.
-   */
-  onBackPressure?: (workerId: number) => void
-  /**
-   * Callback invoked when worker node tasks queue is empty.
-   *
-   * @param workerId - The worker id.
-   */
-  onEmptyQueue?: (workerId: number) => void
   /**
    * Tasks queue size.
    *
@@ -297,4 +323,11 @@ export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
    * @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
 }