Class AbstractPool<Worker, Data, Response>Abstract

Base class that implements some shared logic for all poolifier pools.

Type Parameters

  • Worker extends IWorker

    Type of worker which manages this pool.

  • Data = unknown

    Type of data sent to the worker. This can only be structured-cloneable data.

  • Response = unknown

    Type of execution response. This can only be structured-cloneable data.

Hierarchy

Implements

  • IPool<Worker, Data, Response>

Constructors

Properties

Accessors

Methods

addTaskFunction addWorkerNode afterTaskExecutionHook afterWorkerNodeSetup beforeTaskExecutionHook buildTasksQueueOptions checkAndEmitDynamicWorkerCreationEvents checkAndEmitTaskExecutionEvents checkAndEmitTaskQueuingEvents checkMessageWorkerId checkNumberOfWorkers checkPoolOptions checkValidWorkerChoiceStrategyOptions chooseWorkerNode createAndSetupDynamicWorkerNode createAndSetupWorkerNode createWorker deleteTaskFunctionWorkerUsages dequeueTask deregisterWorkerMessageListener destroy destroyWorkerNode enableTasksQueue enqueueTask execute executeTask flagWorkerNodeAsNotReady flushTasksQueue flushTasksQueues getWorkerInfo getWorkerNodeKeyByWorker getWorkerNodeKeyByWorkerId handleBackPressureEvent handleEmptyQueueEvent handleTaskExecutionResponse handleWorkerReadyResponse hasBackPressure hasTaskFunction hasWorkerNodeBackPressure initializeEventEmitter internalBusy isMain listTaskFunctionNames redistributeQueuedTasks registerOnceWorkerMessageListener registerWorkerMessageListener removeTaskFunction removeWorkerNode sendKillMessageToWorker sendStartupMessageToWorker sendStatisticsMessageToWorker sendTaskFunctionOperationToWorker sendTaskFunctionOperationToWorkers sendToWorker setDefaultTaskFunction setTaskStealing setTasksQueueOptions setTasksQueueSize setTasksStealingOnBackPressure setWorkerChoiceStrategy setWorkerChoiceStrategyOptions setupHook shallCreateDynamicWorker shallExecuteTask shallUpdateTaskFunctionWorkerUsage start tasksQueueSize unsetTaskStealing unsetTasksStealingOnBackPressure updateEluWorkerUsage updateRunTimeWorkerUsage updateTaskStatisticsWorkerUsage updateTaskStolenStatisticsWorkerUsage updateWaitTimeWorkerUsage workerMessageListener

Constructors

  • Constructs a new poolifier pool.

    Type Parameters

    • Worker extends IWorker

    • Data = unknown

    • Response = unknown

    Parameters

    • numberOfWorkers: number

      Number of workers that this pool should manage.

    • filePath: string

      Path to the worker file.

    • opts: PoolOptions<Worker>

      Options for the pool.

    Returns AbstractPool<Worker, Data, Response>

Properties

emitter?: EventEmitterAsyncResource

Event emitter integrated with async resource on which events can be listened to. The async tracking tooling identifier is poolifier:<PoolType>-<WorkerType>-pool.

Events that can currently be listened to:

  • 'ready': Emitted when the number of workers created in the pool has reached the minimum size expected and are ready.
  • 'busy': Emitted when the number of workers created in the pool has reached the maximum size expected and are executing concurrently their tasks quota.
  • 'full': Emitted when the pool is dynamic and the number of workers created has reached the maximum size expected.
  • 'destroy': Emitted when the pool is destroyed.
  • 'error': Emitted when an uncaught error occurs.
  • 'taskError': Emitted when an error occurs while executing a task.
  • 'backPressure': Emitted when all worker nodes have back pressure (i.e. their tasks queue is full: queue size >= maximum queue size).
filePath: string

Path to the worker file.

max?: number

Dynamic pool maximum size property placeholder.

numberOfWorkers: number

Number of workers that this pool should manage.

opts: PoolOptions<Worker>

Options for the pool.

promiseResponseMap: Map<string, PromiseResponseWrapper<Response>> = ...

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.

When we receive a message from the worker, we get a map entry with the promise resolve/reject bound to the message id.

startTimestamp: number

The start timestamp of the pool.

started: boolean

Whether the pool is started or not.

starting: boolean

Whether the pool is starting or not.

taskFunctions: Map<string, TaskFunction<Data, Response>>

The task functions added at runtime map:

  • key: The task function name.
  • value: The task function itself.
workerChoiceStrategyContext: WorkerChoiceStrategyContext<Worker, Data, Response>

Worker choice strategy context referencing a worker choice algorithm implementation.

workerNodes: IWorkerNode<Worker, Data>[] = []

Pool worker nodes.

Accessors

  • get type(): "fixed" | "dynamic"
  • The pool type.

    If it is 'dynamic', it provides the max property.

    Returns "fixed" | "dynamic"

Methods

  • Hook executed after the worker task execution. Can be overridden.

    Parameters

    • workerNodeKey: number

      The worker node key.

    • message: MessageValue<Response, unknown>

      The received message.

    Returns void

  • Method hooked up after a worker node has been newly created. Can be overridden.

    Parameters

    • workerNodeKey: number

      The newly created worker node key.

    Returns void

  • Hook executed before the worker task execution. Can be overridden.

    Parameters

    • workerNodeKey: number

      The worker node key.

    • task: Task<Data>

      The task to execute.

    Returns void

  • Chooses a worker node for the next task.

    The default worker choice strategy uses a round robin algorithm to distribute the tasks.

    Returns number

    The chosen worker node key

  • Creates a new, completely set up dynamic worker node.

    Returns number

    New, completely set up dynamic worker node key.

  • Creates a new, completely set up worker node.

    Returns number

    New, completely set up worker node key.

  • Deregisters a listener callback on the worker given its worker node key.

    Type Parameters

    • Message

    Parameters

    • workerNodeKey: number

      The worker node key.

    • listener: ((message) => void)

      The message listener callback.

        • (message): void
        • Parameters

          Returns void

    Returns void

  • Terminates the worker node given its worker node key.

    Parameters

    • workerNodeKey: number

      The worker node key.

    Returns Promise<void>

  • Enables/disables the worker node tasks queue in this pool.

    Parameters

    • enable: boolean

      Whether to enable or disable the worker node tasks queue.

    • Optional tasksQueueOptions: TasksQueueOptions

      The worker node tasks queue options.

    Returns void

  • Executes the specified function in the worker constructor with the task data input parameter.

    Parameters

    • Optional data: Data

      The optional task input data for the specified task function. This can only be structured-cloneable data.

    • Optional name: string

      The optional name of the task function to execute. If not specified, the default task function will be executed.

    • Optional transferList: TransferListItem[]

      An optional array of transferable objects to transfer ownership of. Ownership of the transferred objects is given to the pool's worker_threads worker and they should not be used in the main thread afterwards.

    Returns Promise<Response>

    Promise that will be fulfilled when the task is completed.

  • Executes the given task on the worker given its worker node key.

    Parameters

    • workerNodeKey: number

      The worker node key.

    • task: Task<Data>

      The task to execute.

    Returns void

  • Gets the given worker its worker node key.

    Parameters

    • worker: Worker

      The worker.

    Returns number

    The worker node key if found in the pool worker nodes, -1 otherwise.

  • Gets the worker node key given its worker id.

    Parameters

    • workerId: undefined | number

      The worker id.

    Returns number

    The worker node key if the worker id is found in the pool worker nodes, -1 otherwise.

  • Whether the specified task function exists in this pool.

    Parameters

    • name: string

      The name of the task function.

    Returns boolean

    true if the task function exists, false otherwise.

  • Internal

    Whether the worker node has back pressure (i.e. its tasks queue is full).

    Parameters

    • workerNodeKey: number

      The worker node key.

    Returns boolean

    true if the worker node has back pressure, false otherwise.

  • Whether worker nodes are executing concurrently their tasks quota or not.

    Returns boolean

    Worker nodes busyness boolean status.

  • Registers once a listener callback on the worker given its worker node key.

    Type Parameters

    • Message

    Parameters

    • workerNodeKey: number

      The worker node key.

    • listener: ((message) => void)

      The message listener callback.

        • (message): void
        • Parameters

          Returns void

    Returns void

  • Registers a listener callback on the worker given its worker node key.

    Type Parameters

    • Message

    Parameters

    • workerNodeKey: number

      The worker node key.

    • listener: ((message) => void)

      The message listener callback.

        • (message): void
        • Parameters

          Returns void

    Returns void

  • Removes a task function from this pool.

    Parameters

    • name: string

      The name of the task function.

    Returns Promise<boolean>

    true if the task function was removed, false otherwise.

  • Removes the given worker from the pool worker nodes.

    Parameters

    • worker: Worker

      The worker.

    Returns void

  • Parameters

    • workerNodeKey: number

    Returns Promise<void>

  • Sends the startup message to worker given its worker node key.

    Parameters

    • workerNodeKey: number

      The worker node key.

    Returns void

  • Sends the statistics message to worker given its worker node key.

    Parameters

    • workerNodeKey: number

      The worker node key.

    Returns void

  • Parameters

    Returns Promise<boolean>

  • Sends a message to worker given its worker node key.

    Parameters

    • workerNodeKey: number

      The worker node key.

    • message: MessageValue<Data, unknown>

      The message.

    • Optional transferList: TransferListItem[]

      The optional array of transferable objects.

    Returns void

  • Sets the default task function in this pool.

    Parameters

    • name: string

      The name of the task function.

    Returns Promise<boolean>

    true if the default task function was set, false otherwise.

  • Sets the worker choice strategy in this pool.

    Parameters

    • workerChoiceStrategy: "ROUND_ROBIN" | "LEAST_USED" | "LEAST_BUSY" | "LEAST_ELU" | "FAIR_SHARE" | "WEIGHTED_ROUND_ROBIN" | "INTERLEAVED_WEIGHTED_ROUND_ROBIN"

      The worker choice strategy.

    • Optional workerChoiceStrategyOptions: WorkerChoiceStrategyOptions

      The worker choice strategy options.

    Returns void

  • Setup hook to execute code before worker nodes are created in the abstract constructor. Can be overridden.

    Returns void

  • Conditions for dynamic worker creation.

    Returns boolean

    Whether to create a dynamic worker or not.

  • Whether the worker node shall update its task function worker usage or not.

    Parameters

    • workerNodeKey: number

      The worker node key.

    Returns boolean

    true if the worker node shall update its task function worker usage, false otherwise.

  • Parameters

    • workerNodeKey: number
    • taskName: string

    Returns void

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