Class DynamicThreadPool<Data, Response>

A thread pool with a dynamic number of threads, but a guaranteed minimum number of threads.

This thread pool creates new threads when the others are busy, up to the maximum number of threads. When the maximum number of threads is reached and workers are busy, an event is emitted. If you want to listen to this event, use the pool's emitter.

Author

Alessandro Pio Ardizio

Since

0.0.1

Type Parameters

  • 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

Constructors

  • Constructs a new poolifier dynamic thread pool.

    Type Parameters

    • Data = unknown

    • Response = unknown

    Parameters

    • min: number

      Minimum number of threads which are always active.

    • max: number

      Maximum number of threads that can be created by this pool.

    • filePath: string

      Path to an implementation of a ThreadWorker file, which can be relative or absolute.

    • opts: ThreadPoolOptions = {}

      Options for this dynamic thread pool.

    Returns DynamicThreadPool<Data, Response>

Properties

emitter?: PoolEmitter

Emitter on which events can be listened to.

Events that can currently be listened to:

  • 'full': Emitted when the pool is dynamic and full.
  • 'busy': Emitted when the pool is busy.
  • 'error': Emitted when an uncaught error occurs.
  • 'taskError': Emitted when an error occurs while executing a task.
filePath: string

Path to the worker file.

max: number

Maximum number of threads that can be created by this pool.

numberOfWorkers: number

Number of workers that this pool should manage.

Options for this fixed thread pool.

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

The 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.

workerChoiceStrategyContext: WorkerChoiceStrategyContext<Worker, Data, Response>

Worker choice strategy context referencing a worker choice algorithm implementation.

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

Pool worker nodes.

Accessors

  • get busy(): boolean
  • Whether the pool is busy or not.

    The pool busyness boolean status.

    Returns boolean

  • get full(): boolean
  • Whether the pool is full or not.

    The pool filling boolean status.

    Returns boolean

  • get type(): "fixed" | "dynamic"
  • Pool type.

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

    Returns "fixed" | "dynamic"

  • get worker(): "cluster" | "thread"
  • Gets the worker type.

    Returns "cluster" | "thread"

Methods

  • Function that can be hooked up when a worker has been newly created and moved to the pool worker nodes. Can be overridden.

    Parameters

    • worker: Worker

      The newly created worker.

    Returns void

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

    Parameters

    • Optional data: Data

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

    • Optional name: string

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

    Returns Promise<Response>

    Promise that will be fulfilled when the task is completed.

  • 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

  • This function is the listener registered for each worker message.

    Returns ((message) => void)

    The listener function to execute when a message is received from a worker.

      • (message): void
      • This function is the listener registered for each worker message.

        Parameters

        Returns void

        The listener function to execute when a message is received from a worker.

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