X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fpools%2Fabstract-pool.ts;h=9aeeebed772b37234c2a8f0e88c5cb45c65f0dce;hb=b0b55f57cb5e2bc363bc75d84b483c9c29a5d22f;hp=3dcbceaba1bfb6012f98c80c73f81a332f80e468;hpb=1a28f967262fc8968d12fb0ef0be93f768607266;p=poolifier.git

diff --git a/src/pools/abstract-pool.ts b/src/pools/abstract-pool.ts
index 3dcbceab..9aeeebed 100644
--- a/src/pools/abstract-pool.ts
+++ b/src/pools/abstract-pool.ts
@@ -21,6 +21,7 @@ import {
   updateMeasurementStatistics
 } from '../utils'
 import { KillBehaviors } from '../worker/worker-options'
+import type { TaskFunction } from '../worker/task-functions'
 import {
   type IPool,
   PoolEmitter,
@@ -68,8 +69,7 @@ export abstract class AbstractPool<
   public readonly emitter?: PoolEmitter
 
   /**
-   * The task execution response promise map.
-   *
+   * The task execution response promise map:
    * - `key`: The message id of each submitted task.
    * - `value`: An object that contains the worker, the execution response promise resolve and reject callbacks.
    *
@@ -93,13 +93,20 @@ export abstract class AbstractPool<
   protected readonly max?: number
 
   /**
-   * Whether the pool is starting or not.
+   * The task functions added at runtime map:
+   * - `key`: The task function name.
+   * - `value`: The task function itself.
    */
-  private readonly starting: boolean
+  private readonly taskFunctions: Map<string, TaskFunction<Data, Response>>
+
   /**
    * Whether the pool is started or not.
    */
   private started: boolean
+  /**
+   * Whether the pool is starting or not.
+   */
+  private starting: boolean
   /**
    * The start timestamp of the pool.
    */
@@ -145,10 +152,13 @@ export abstract class AbstractPool<
 
     this.setupHook()
 
-    this.starting = true
-    this.startPool()
+    this.taskFunctions = new Map<string, TaskFunction<Data, Response>>()
+
+    this.started = false
     this.starting = false
-    this.started = true
+    if (this.opts.startWorkers === true) {
+      this.start()
+    }
 
     this.startTimestamp = performance.now()
   }
@@ -212,16 +222,19 @@ export abstract class AbstractPool<
 
   private checkPoolOptions (opts: PoolOptions<Worker>): void {
     if (isPlainObject(opts)) {
+      this.opts.startWorkers = opts.startWorkers ?? true
+      this.checkValidWorkerChoiceStrategy(
+        opts.workerChoiceStrategy as WorkerChoiceStrategy
+      )
       this.opts.workerChoiceStrategy =
         opts.workerChoiceStrategy ?? WorkerChoiceStrategies.ROUND_ROBIN
-      this.checkValidWorkerChoiceStrategy(this.opts.workerChoiceStrategy)
+      this.checkValidWorkerChoiceStrategyOptions(
+        opts.workerChoiceStrategyOptions as WorkerChoiceStrategyOptions
+      )
       this.opts.workerChoiceStrategyOptions = {
         ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
         ...opts.workerChoiceStrategyOptions
       }
-      this.checkValidWorkerChoiceStrategyOptions(
-        this.opts.workerChoiceStrategyOptions
-      )
       this.opts.restartWorkerOnError = opts.restartWorkerOnError ?? true
       this.opts.enableEvents = opts.enableEvents ?? true
       this.opts.enableTasksQueue = opts.enableTasksQueue ?? false
@@ -241,7 +254,10 @@ export abstract class AbstractPool<
   private checkValidWorkerChoiceStrategy (
     workerChoiceStrategy: WorkerChoiceStrategy
   ): void {
-    if (!Object.values(WorkerChoiceStrategies).includes(workerChoiceStrategy)) {
+    if (
+      workerChoiceStrategy != null &&
+      !Object.values(WorkerChoiceStrategies).includes(workerChoiceStrategy)
+    ) {
       throw new Error(
         `Invalid worker choice strategy '${workerChoiceStrategy}'`
       )
@@ -251,13 +267,16 @@ export abstract class AbstractPool<
   private checkValidWorkerChoiceStrategyOptions (
     workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
   ): void {
-    if (!isPlainObject(workerChoiceStrategyOptions)) {
+    if (
+      workerChoiceStrategyOptions != null &&
+      !isPlainObject(workerChoiceStrategyOptions)
+    ) {
       throw new TypeError(
         'Invalid worker choice strategy options: must be a plain object'
       )
     }
     if (
-      workerChoiceStrategyOptions.retries != null &&
+      workerChoiceStrategyOptions?.retries != null &&
       !Number.isSafeInteger(workerChoiceStrategyOptions.retries)
     ) {
       throw new TypeError(
@@ -265,7 +284,7 @@ export abstract class AbstractPool<
       )
     }
     if (
-      workerChoiceStrategyOptions.retries != null &&
+      workerChoiceStrategyOptions?.retries != null &&
       workerChoiceStrategyOptions.retries < 0
     ) {
       throw new RangeError(
@@ -273,7 +292,7 @@ export abstract class AbstractPool<
       )
     }
     if (
-      workerChoiceStrategyOptions.weights != null &&
+      workerChoiceStrategyOptions?.weights != null &&
       Object.keys(workerChoiceStrategyOptions.weights).length !== this.maxSize
     ) {
       throw new Error(
@@ -281,7 +300,7 @@ export abstract class AbstractPool<
       )
     }
     if (
-      workerChoiceStrategyOptions.measurement != null &&
+      workerChoiceStrategyOptions?.measurement != null &&
       !Object.values(Measurements).includes(
         workerChoiceStrategyOptions.measurement
       )
@@ -300,7 +319,7 @@ export abstract class AbstractPool<
     }
     if (
       tasksQueueOptions?.concurrency != null &&
-      !Number.isSafeInteger(tasksQueueOptions?.concurrency)
+      !Number.isSafeInteger(tasksQueueOptions.concurrency)
     ) {
       throw new TypeError(
         'Invalid worker node tasks concurrency: must be an integer'
@@ -308,50 +327,34 @@ export abstract class AbstractPool<
     }
     if (
       tasksQueueOptions?.concurrency != null &&
-      tasksQueueOptions?.concurrency <= 0
+      tasksQueueOptions.concurrency <= 0
     ) {
       throw new RangeError(
-        `Invalid worker node tasks concurrency: ${tasksQueueOptions?.concurrency} is a negative integer or zero`
-      )
-    }
-    if (tasksQueueOptions?.queueMaxSize != null) {
-      throw new Error(
-        'Invalid tasks queue options: queueMaxSize is deprecated, please use size instead'
+        `Invalid worker node tasks concurrency: ${tasksQueueOptions.concurrency} is a negative integer or zero`
       )
     }
     if (
       tasksQueueOptions?.size != null &&
-      !Number.isSafeInteger(tasksQueueOptions?.size)
+      !Number.isSafeInteger(tasksQueueOptions.size)
     ) {
       throw new TypeError(
         'Invalid worker node tasks queue size: must be an integer'
       )
     }
-    if (tasksQueueOptions?.size != null && tasksQueueOptions?.size <= 0) {
+    if (tasksQueueOptions?.size != null && tasksQueueOptions.size <= 0) {
       throw new RangeError(
-        `Invalid worker node tasks queue size: ${tasksQueueOptions?.size} is a negative integer or zero`
+        `Invalid worker node tasks queue size: ${tasksQueueOptions.size} is a negative integer or zero`
       )
     }
   }
 
-  private startPool (): void {
-    while (
-      this.workerNodes.reduce(
-        (accumulator, workerNode) =>
-          !workerNode.info.dynamic ? accumulator + 1 : accumulator,
-        0
-      ) < this.numberOfWorkers
-    ) {
-      this.createAndSetupWorkerNode()
-    }
-  }
-
   /** @inheritDoc */
   public get info (): PoolInfo {
     return {
       version,
       type: this.type,
       worker: this.worker,
+      started: this.started,
       ready: this.ready,
       strategy: this.opts.workerChoiceStrategy as WorkerChoiceStrategy,
       minSize: this.minSize,
@@ -600,7 +603,7 @@ export abstract class AbstractPool<
    * @param workerId - The worker id.
    * @returns The worker node key if the worker id is found in the pool worker nodes, `-1` otherwise.
    */
-  private getWorkerNodeKeyByWorkerId (workerId: number): number {
+  private getWorkerNodeKeyByWorkerId (workerId: number | undefined): number {
     return this.workerNodes.findIndex(
       workerNode => workerNode.info.id === workerId
     )
@@ -645,6 +648,8 @@ export abstract class AbstractPool<
     tasksQueueOptions?: TasksQueueOptions
   ): void {
     if (this.opts.enableTasksQueue === true && !enable) {
+      this.unsetTaskStealing()
+      this.unsetTasksStealingOnBackPressure()
       this.flushTasksQueues()
     }
     this.opts.enableTasksQueue = enable
@@ -658,29 +663,67 @@ export abstract class AbstractPool<
       this.opts.tasksQueueOptions =
         this.buildTasksQueueOptions(tasksQueueOptions)
       this.setTasksQueueSize(this.opts.tasksQueueOptions.size as number)
+      if (this.opts.tasksQueueOptions.taskStealing === true) {
+        this.setTaskStealing()
+      } else {
+        this.unsetTaskStealing()
+      }
+      if (this.opts.tasksQueueOptions.tasksStealingOnBackPressure === true) {
+        this.setTasksStealingOnBackPressure()
+      } else {
+        this.unsetTasksStealingOnBackPressure()
+      }
     } else if (this.opts.tasksQueueOptions != null) {
       delete this.opts.tasksQueueOptions
     }
   }
 
-  private setTasksQueueSize (size: number): void {
-    for (const workerNode of this.workerNodes) {
-      workerNode.tasksQueueBackPressureSize = size
-    }
-  }
-
   private buildTasksQueueOptions (
     tasksQueueOptions: TasksQueueOptions
   ): TasksQueueOptions {
     return {
       ...{
         size: Math.pow(this.maxSize, 2),
-        concurrency: 1
+        concurrency: 1,
+        taskStealing: true,
+        tasksStealingOnBackPressure: true
       },
       ...tasksQueueOptions
     }
   }
 
+  private setTasksQueueSize (size: number): void {
+    for (const workerNode of this.workerNodes) {
+      workerNode.tasksQueueBackPressureSize = size
+    }
+  }
+
+  private setTaskStealing (): void {
+    for (const [workerNodeKey] of this.workerNodes.entries()) {
+      this.workerNodes[workerNodeKey].onEmptyQueue =
+        this.taskStealingOnEmptyQueue.bind(this)
+    }
+  }
+
+  private unsetTaskStealing (): void {
+    for (const [workerNodeKey] of this.workerNodes.entries()) {
+      delete this.workerNodes[workerNodeKey].onEmptyQueue
+    }
+  }
+
+  private setTasksStealingOnBackPressure (): void {
+    for (const [workerNodeKey] of this.workerNodes.entries()) {
+      this.workerNodes[workerNodeKey].onBackPressure =
+        this.tasksStealingOnBackPressure.bind(this)
+    }
+  }
+
+  private unsetTasksStealingOnBackPressure (): void {
+    for (const [workerNodeKey] of this.workerNodes.entries()) {
+      delete this.workerNodes[workerNodeKey].onBackPressure
+    }
+  }
+
   /**
    * Whether the pool is full or not.
    *
@@ -712,29 +755,169 @@ export abstract class AbstractPool<
               (this.opts.tasksQueueOptions?.concurrency as number)
         ) === -1
       )
-    } else {
-      return (
-        this.workerNodes.findIndex(
-          workerNode =>
-            workerNode.info.ready && workerNode.usage.tasks.executing === 0
-        ) === -1
+    }
+    return (
+      this.workerNodes.findIndex(
+        workerNode =>
+          workerNode.info.ready && workerNode.usage.tasks.executing === 0
+      ) === -1
+    )
+  }
+
+  private async sendTaskFunctionOperationToWorker (
+    workerNodeKey: number,
+    message: MessageValue<Data>
+  ): Promise<boolean> {
+    return await new Promise<boolean>((resolve, reject) => {
+      const workerId = this.getWorkerInfo(workerNodeKey).id as number
+      this.registerWorkerMessageListener(workerNodeKey, message => {
+        if (
+          message.workerId === workerId &&
+          message.taskFunctionOperationStatus === true
+        ) {
+          resolve(true)
+        } else if (
+          message.workerId === workerId &&
+          message.taskFunctionOperationStatus === false
+        ) {
+          reject(
+            new Error(
+              `Task function operation '${
+                message.taskFunctionOperation as string
+              }' failed on worker ${message.workerId} with error: '${
+                message.workerError?.message as string
+              }'`
+            )
+          )
+        }
+      })
+      this.sendToWorker(workerNodeKey, message)
+    })
+  }
+
+  private async sendTaskFunctionOperationToWorkers (
+    message: MessageValue<Data>
+  ): Promise<boolean> {
+    return await new Promise<boolean>((resolve, reject) => {
+      const responsesReceived = new Array<MessageValue<Data | Response>>()
+      for (const [workerNodeKey] of this.workerNodes.entries()) {
+        this.registerWorkerMessageListener(workerNodeKey, message => {
+          if (message.taskFunctionOperationStatus != null) {
+            responsesReceived.push(message)
+            if (
+              responsesReceived.length === this.workerNodes.length &&
+              responsesReceived.every(
+                message => message.taskFunctionOperationStatus === true
+              )
+            ) {
+              resolve(true)
+            } else if (
+              responsesReceived.length === this.workerNodes.length &&
+              responsesReceived.some(
+                message => message.taskFunctionOperationStatus === false
+              )
+            ) {
+              const errorResponse = responsesReceived.find(
+                response => response.taskFunctionOperationStatus === false
+              )
+              reject(
+                new Error(
+                  `Task function operation '${
+                    message.taskFunctionOperation as string
+                  }' failed on worker ${
+                    errorResponse?.workerId as number
+                  } with error: '${
+                    errorResponse?.workerError?.message as string
+                  }'`
+                )
+              )
+            }
+          }
+        })
+        this.sendToWorker(workerNodeKey, message)
+      }
+    })
+  }
+
+  /** @inheritDoc */
+  public hasTaskFunction (name: string): boolean {
+    for (const workerNode of this.workerNodes) {
+      if (
+        Array.isArray(workerNode.info.taskFunctionNames) &&
+        workerNode.info.taskFunctionNames.includes(name)
+      ) {
+        return true
+      }
+    }
+    return false
+  }
+
+  /** @inheritDoc */
+  public async addTaskFunction (
+    name: string,
+    fn: TaskFunction<Data, Response>
+  ): Promise<boolean> {
+    if (typeof name !== 'string') {
+      throw new TypeError('name argument must be a string')
+    }
+    if (typeof name === 'string' && name.trim().length === 0) {
+      throw new TypeError('name argument must not be an empty string')
+    }
+    if (typeof fn !== 'function') {
+      throw new TypeError('fn argument must be a function')
+    }
+    const opResult = await this.sendTaskFunctionOperationToWorkers({
+      taskFunctionOperation: 'add',
+      taskFunctionName: name,
+      taskFunction: fn.toString()
+    })
+    this.taskFunctions.set(name, fn)
+    return opResult
+  }
+
+  /** @inheritDoc */
+  public async removeTaskFunction (name: string): Promise<boolean> {
+    if (!this.taskFunctions.has(name)) {
+      throw new Error(
+        'Cannot remove a task function not handled on the pool side'
       )
     }
+    const opResult = await this.sendTaskFunctionOperationToWorkers({
+      taskFunctionOperation: 'remove',
+      taskFunctionName: name
+    })
+    this.deleteTaskFunctionWorkerUsages(name)
+    this.taskFunctions.delete(name)
+    return opResult
   }
 
   /** @inheritDoc */
-  public listTaskFunctions (): string[] {
+  public listTaskFunctionNames (): string[] {
     for (const workerNode of this.workerNodes) {
       if (
-        Array.isArray(workerNode.info.taskFunctions) &&
-        workerNode.info.taskFunctions.length > 0
+        Array.isArray(workerNode.info.taskFunctionNames) &&
+        workerNode.info.taskFunctionNames.length > 0
       ) {
-        return workerNode.info.taskFunctions
+        return workerNode.info.taskFunctionNames
       }
     }
     return []
   }
 
+  /** @inheritDoc */
+  public async setDefaultTaskFunction (name: string): Promise<boolean> {
+    return await this.sendTaskFunctionOperationToWorkers({
+      taskFunctionOperation: 'default',
+      taskFunctionName: name
+    })
+  }
+
+  private deleteTaskFunctionWorkerUsages (name: string): void {
+    for (const workerNode of this.workerNodes) {
+      workerNode.deleteTaskFunctionWorkerUsage(name)
+    }
+  }
+
   private shallExecuteTask (workerNodeKey: number): boolean {
     return (
       this.tasksQueueSize(workerNodeKey) === 0 &&
@@ -751,7 +934,7 @@ export abstract class AbstractPool<
   ): Promise<Response> {
     return await new Promise<Response>((resolve, reject) => {
       if (!this.started) {
-        reject(new Error('Cannot execute a task on destroyed pool'))
+        reject(new Error('Cannot execute a task on not started pool'))
         return
       }
       if (name != null && typeof name !== 'string') {
@@ -778,7 +961,6 @@ export abstract class AbstractPool<
         data: data ?? ({} as Data),
         transferList,
         timestamp,
-        workerId: this.getWorkerInfo(workerNodeKey).id as number,
         taskId: randomUUID()
       }
       this.promiseResponseMap.set(task.taskId as string, {
@@ -798,6 +980,22 @@ export abstract class AbstractPool<
     })
   }
 
+  /** @inheritdoc */
+  public start (): void {
+    this.starting = true
+    while (
+      this.workerNodes.reduce(
+        (accumulator, workerNode) =>
+          !workerNode.info.dynamic ? accumulator + 1 : accumulator,
+        0
+      ) < this.numberOfWorkers
+    ) {
+      this.createAndSetupWorkerNode()
+    }
+    this.starting = false
+    this.started = true
+  }
+
   /** @inheritDoc */
   public async destroy (): Promise<void> {
     await Promise.all(
@@ -810,18 +1008,23 @@ export abstract class AbstractPool<
   }
 
   protected async sendKillMessageToWorker (
-    workerNodeKey: number,
-    workerId: number
+    workerNodeKey: number
   ): Promise<void> {
     await new Promise<void>((resolve, reject) => {
       this.registerWorkerMessageListener(workerNodeKey, message => {
         if (message.kill === 'success') {
           resolve()
         } else if (message.kill === 'failure') {
-          reject(new Error(`Worker ${workerId} kill message handling failed`))
+          reject(
+            new Error(
+              `Worker ${
+                message.workerId as number
+              } kill message handling failed`
+            )
+          )
         }
       })
-      this.sendToWorker(workerNodeKey, { kill: true, workerId })
+      this.sendToWorker(workerNodeKey, { kill: true })
     })
   }
 
@@ -921,8 +1124,8 @@ export abstract class AbstractPool<
     const workerInfo = this.getWorkerInfo(workerNodeKey)
     return (
       workerInfo != null &&
-      Array.isArray(workerInfo.taskFunctions) &&
-      workerInfo.taskFunctions.length > 2
+      Array.isArray(workerInfo.taskFunctionNames) &&
+      workerInfo.taskFunctionNames.length > 2
     )
   }
 
@@ -937,7 +1140,7 @@ export abstract class AbstractPool<
     ) {
       --workerTaskStatistics.executing
     }
-    if (message.taskError == null) {
+    if (message.workerError == null) {
       ++workerTaskStatistics.executed
     } else {
       ++workerTaskStatistics.failed
@@ -948,7 +1151,7 @@ export abstract class AbstractPool<
     workerUsage: WorkerUsage,
     message: MessageValue<Response>
   ): void {
-    if (message.taskError != null) {
+    if (message.workerError != null) {
       return
     }
     updateMeasurementStatistics(
@@ -975,7 +1178,7 @@ export abstract class AbstractPool<
     workerUsage: WorkerUsage,
     message: MessageValue<Response>
   ): void {
-    if (message.taskError != null) {
+    if (message.workerError != null) {
       return
     }
     const eluTaskStatisticsRequirements: MeasurementStatisticsRequirements =
@@ -1070,9 +1273,9 @@ export abstract class AbstractPool<
       this.workerNodes[workerNodeKey].closeChannel()
       this.emitter?.emit(PoolEvents.error, error)
       if (
-        this.opts.restartWorkerOnError === true &&
+        this.started &&
         !this.starting &&
-        this.started
+        this.opts.restartWorkerOnError === true
       ) {
         if (workerInfo.dynamic) {
           this.createAndSetupDynamicWorkerNode()
@@ -1080,7 +1283,7 @@ export abstract class AbstractPool<
           this.createAndSetupWorkerNode()
         }
       }
-      if (this.opts.enableTasksQueue === true) {
+      if (this.started && this.opts.enableTasksQueue === true) {
         this.redistributeQueuedTasks(workerNodeKey)
       }
     })
@@ -1125,9 +1328,19 @@ export abstract class AbstractPool<
     })
     const workerInfo = this.getWorkerInfo(workerNodeKey)
     this.sendToWorker(workerNodeKey, {
-      checkActive: true,
-      workerId: workerInfo.id as number
+      checkActive: true
     })
+    if (this.taskFunctions.size > 0) {
+      for (const [taskFunctionName, taskFunction] of this.taskFunctions) {
+        this.sendTaskFunctionOperationToWorker(workerNodeKey, {
+          taskFunctionOperation: 'add',
+          taskFunctionName,
+          taskFunction: taskFunction.toString()
+        }).catch(error => {
+          this.emitter?.emit(PoolEvents.error, error)
+        })
+      }
+    }
     workerInfo.dynamic = true
     if (
       this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerReady ||
@@ -1166,10 +1379,14 @@ export abstract class AbstractPool<
     // Send the statistics message to worker.
     this.sendStatisticsMessageToWorker(workerNodeKey)
     if (this.opts.enableTasksQueue === true) {
-      this.workerNodes[workerNodeKey].onEmptyQueue =
-        this.taskStealingOnEmptyQueue.bind(this)
-      this.workerNodes[workerNodeKey].onBackPressure =
-        this.tasksStealingOnBackPressure.bind(this)
+      if (this.opts.tasksQueueOptions?.taskStealing === true) {
+        this.workerNodes[workerNodeKey].onEmptyQueue =
+          this.taskStealingOnEmptyQueue.bind(this)
+      }
+      if (this.opts.tasksQueueOptions?.tasksStealingOnBackPressure === true) {
+        this.workerNodes[workerNodeKey].onBackPressure =
+          this.tasksStealingOnBackPressure.bind(this)
+      }
     }
   }
 
@@ -1193,8 +1410,7 @@ export abstract class AbstractPool<
             .runTime.aggregate,
         elu: this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
           .elu.aggregate
-      },
-      workerId: this.getWorkerInfo(workerNodeKey).id as number
+      }
     })
   }
 
@@ -1210,11 +1426,7 @@ export abstract class AbstractPool<
         },
         0
       )
-      const destinationWorkerNode = this.workerNodes[destinationWorkerNodeKey]
-      const task = {
-        ...(this.dequeueTask(workerNodeKey) as Task<Data>),
-        workerId: destinationWorkerNode.info.id as number
-      }
+      const task = this.dequeueTask(workerNodeKey) as Task<Data>
       if (this.shallExecuteTask(destinationWorkerNodeKey)) {
         this.executeTask(destinationWorkerNodeKey, task)
       } else {
@@ -1244,7 +1456,6 @@ export abstract class AbstractPool<
 
   private taskStealingOnEmptyQueue (workerId: number): void {
     const destinationWorkerNodeKey = this.getWorkerNodeKeyByWorkerId(workerId)
-    const destinationWorkerNode = this.workerNodes[destinationWorkerNodeKey]
     const workerNodes = this.workerNodes
       .slice()
       .sort(
@@ -1258,10 +1469,7 @@ export abstract class AbstractPool<
         workerNode.usage.tasks.queued > 0
     )
     if (sourceWorkerNode != null) {
-      const task = {
-        ...(sourceWorkerNode.popTask() as Task<Data>),
-        workerId: destinationWorkerNode.info.id as number
-      }
+      const task = sourceWorkerNode.popTask() as Task<Data>
       if (this.shallExecuteTask(destinationWorkerNodeKey)) {
         this.executeTask(destinationWorkerNodeKey, task)
       } else {
@@ -1295,10 +1503,7 @@ export abstract class AbstractPool<
         workerNode.usage.tasks.queued <
           (this.opts.tasksQueueOptions?.size as number) - sizeOffset
       ) {
-        const task = {
-          ...(sourceWorkerNode.popTask() as Task<Data>),
-          workerId: workerNode.info.id as number
-        }
+        const task = sourceWorkerNode.popTask() as Task<Data>
         if (this.shallExecuteTask(workerNodeKey)) {
           this.executeTask(workerNodeKey, task)
         } else {
@@ -1320,42 +1525,44 @@ export abstract class AbstractPool<
   protected workerListener (): (message: MessageValue<Response>) => void {
     return message => {
       this.checkMessageWorkerId(message)
-      if (message.ready != null && message.taskFunctions != null) {
+      if (message.ready != null && message.taskFunctionNames != null) {
         // Worker ready response received from worker
         this.handleWorkerReadyResponse(message)
       } else if (message.taskId != null) {
         // Task execution response received from worker
         this.handleTaskExecutionResponse(message)
-      } else if (message.taskFunctions != null) {
-        // Task functions message received from worker
+      } else if (message.taskFunctionNames != null) {
+        // Task function names message received from worker
         this.getWorkerInfo(
           this.getWorkerNodeKeyByWorkerId(message.workerId)
-        ).taskFunctions = message.taskFunctions
+        ).taskFunctionNames = message.taskFunctionNames
       }
     }
   }
 
   private handleWorkerReadyResponse (message: MessageValue<Response>): void {
     if (message.ready === false) {
-      throw new Error(`Worker ${message.workerId} failed to initialize`)
+      throw new Error(
+        `Worker ${message.workerId as number} failed to initialize`
+      )
     }
     const workerInfo = this.getWorkerInfo(
       this.getWorkerNodeKeyByWorkerId(message.workerId)
     )
     workerInfo.ready = message.ready as boolean
-    workerInfo.taskFunctions = message.taskFunctions
-    if (this.emitter != null && this.ready) {
-      this.emitter.emit(PoolEvents.ready, this.info)
+    workerInfo.taskFunctionNames = message.taskFunctionNames
+    if (this.ready) {
+      this.emitter?.emit(PoolEvents.ready, this.info)
     }
   }
 
   private handleTaskExecutionResponse (message: MessageValue<Response>): void {
-    const { taskId, taskError, data } = message
+    const { taskId, workerError, data } = message
     const promiseResponse = this.promiseResponseMap.get(taskId as string)
     if (promiseResponse != null) {
-      if (taskError != null) {
-        this.emitter?.emit(PoolEvents.taskError, taskError)
-        promiseResponse.reject(taskError.message)
+      if (workerError != null) {
+        this.emitter?.emit(PoolEvents.taskError, workerError)
+        promiseResponse.reject(workerError.message)
       } else {
         promiseResponse.resolve(data as Response)
       }