fix: fix back pressure detection

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

diff --git a/src/pools/worker.ts b/src/pools/worker.ts
index 2da91457aed58994f01714a162adffba69ab61fe..1d0c4e22e47f073384bdf8c69e3c477ea9cb1d2b 100644 (file)
--- a/src/pools/worker.ts
+++ b/src/pools/worker.ts
@@ -2,6 +2,11 @@ import type { MessageChannel } from 'node:worker_threads'
 import type { CircularArray } from '../circular-array'
 import type { Task } from '../utility-types'
 
+/**
+ * Callback invoked when the worker has started successfully.
+ */
+export type OnlineHandler<Worker extends IWorker> = (this: Worker) => void
+
 /**
  * Callback invoked if the worker has received a message.
  */
@@ -18,11 +23,6 @@ export type ErrorHandler<Worker extends IWorker> = (
   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.
  */
@@ -138,9 +138,9 @@ export interface WorkerInfo {
    */
   ready: boolean
   /**
-   * Message channel.
+   * Task function names.
    */
-  messageChannel?: MessageChannel
+  taskFunctions?: string[]
 }
 
 /**
@@ -182,9 +182,9 @@ export interface IWorker {
    * @param event - The event.
    * @param handler - The event handler.
    */
-  readonly on: ((event: 'message', handler: MessageHandler<this>) => void) &
+  readonly on: ((event: 'online', handler: OnlineHandler<this>) => void) &
+  ((event: 'message', handler: MessageHandler<this>) => void) &
   ((event: 'error', handler: ErrorHandler<this>) => void) &
-  ((event: 'online', handler: OnlineHandler<this>) => void) &
   ((event: 'exit', handler: ExitHandler<this>) => void)
   /**
    * Registers a listener to the exit event that will only be performed once.
@@ -211,6 +211,10 @@ export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
    * Worker info.
    */
   readonly info: WorkerInfo
+  /**
+   * Message channel.
+   */
+  readonly messageChannel?: MessageChannel
   /**
    * Worker usage statistics.
    */
@@ -225,7 +229,7 @@ export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
    * Enqueue task.
    *
    * @param task - The task to queue.
-   * @returns The task queue size.
+   * @returns The tasks queue size.
    */
   readonly enqueueTask: (task: Task<Data>) => number
   /**
@@ -239,15 +243,24 @@ export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
    */
   readonly clearTasksQueue: () => void
   /**
-   * Resets 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
   /**
-   * Close communication channel.
+   * Closes communication channel.
    */
   readonly closeChannel: () => void
   /**
-   * Gets task worker usage statistics.
+   * 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 getTaskWorkerUsage: (name: string) => WorkerUsage | undefined
+  readonly getTaskFunctionWorkerUsage: (name: string) => WorkerUsage | undefined
 }