fix: fix back pressure detection

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

diff --git a/src/pools/worker.ts b/src/pools/worker.ts
index c6303221c9d2da4badc9af17ac6e8a80fda27d98..1d0c4e22e47f073384bdf8c69e3c477ea9cb1d2b 100644 (file)
--- a/src/pools/worker.ts
+++ b/src/pools/worker.ts
@@ -1,4 +1,11 @@
+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.
@@ -16,11 +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.
  */
@@ -29,35 +31,6 @@ export type ExitHandler<Worker extends IWorker> = (
   exitCode: number
 ) => void
 
-/**
- * Message object that is passed as a task between main worker and worker.
- *
- * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
- * @internal
- */
-export interface Task<Data = unknown> {
-  /**
-   * Worker id.
-   */
-  readonly workerId: number
-  /**
-   * 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
-}
-
 /**
  * Measurement statistics.
  *
@@ -122,7 +95,7 @@ export interface TaskStatistics {
   /**
    * Maximum number of queued tasks.
    */
-  readonly maxQueued: number
+  readonly maxQueued?: number
   /**
    * Number of failed tasks.
    */
@@ -133,8 +106,8 @@ export interface TaskStatistics {
  * Enumeration of worker types.
  */
 export const WorkerTypes = Object.freeze({
-  cluster: 'cluster',
-  thread: 'thread'
+  thread: 'thread',
+  cluster: 'cluster'
 } as const)
 
 /**
@@ -164,6 +137,10 @@ export interface WorkerInfo {
    * Ready flag.
    */
   ready: boolean
+  /**
+   * Task function names.
+   */
+  taskFunctions?: string[]
 }
 
 /**
@@ -205,9 +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.
@@ -227,42 +204,63 @@ export interface IWorker {
  */
 export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
   /**
-   * Worker node worker.
+   * Worker.
    */
   readonly worker: Worker
   /**
-   * Worker node worker info.
+   * Worker info.
    */
   readonly info: WorkerInfo
   /**
-   * Worker node worker usage statistics.
+   * Message channel.
+   */
+  readonly messageChannel?: MessageChannel
+  /**
+   * Worker usage statistics.
    */
   usage: WorkerUsage
   /**
-   * 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.
+   * Dequeue task.
    *
    * @returns The dequeued task.
    */
   readonly dequeueTask: () => Task<Data> | undefined
   /**
-   * Worker node clear tasks queue.
+   * 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
+  /**
+   * Closes communication channel.
+   */
+  readonly closeChannel: () => 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
 }