Class DynamicClusterPool<Data, Response>

A cluster pool with a dynamic number of workers, but a guaranteed minimum number of workers.

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

Author

Christopher Quadflieg

Since

2.0.0

Type Parameters

  • Data = unknown

    Type of data sent to the worker. This can only be serializable data.

  • Response = unknown

    Type of response of execution. This can only be serializable data.

Hierarchy

Constructors

  • Constructs a new poolifier dynamic cluster pool.

    Type Parameters

    • Data = unknown

    • Response = unknown

    Parameters

    • min: number

      Minimum number of workers which are always active.

    • max: number

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

    • filePath: string

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

    • opts: ClusterPoolOptions = EMPTY_OBJECT_LITERAL

      Options for this dynamic cluster pool.

    Returns DynamicClusterPool<Data, Response>

Properties

emitter?: PoolEmitter

{@inheritDoc}

filePath: string

Path to the worker-file.

max: number

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

nextMessageId: number = 0

Id of the next message.

numberOfWorkers: number

Number of workers that this pool should manage.

opts: ClusterPoolOptions = EMPTY_OBJECT_LITERAL

Options for this fixed cluster pool.

promiseMap: Map<number, PromiseWorkerResponseWrapper<Worker, Response>> = ...

The promise map.

  • key: This is the message Id of each submitted task.
  • value: An object that contains the worker, the resolve function and the reject function.

When we receive a message from the worker we get a map entry and resolve/reject the promise based on the message.

workerChoiceStrategyContext: WorkerChoiceStrategyContext<Worker, Data, Response>

Worker choice strategy instance implementing the worker choice algorithm.

Default to a strategy implementing a round robin algorithm.

workers: Worker[] = []

{@inheritDoc}

workersTasksUsage: Map<Worker, TasksUsage> = ...

{@inheritDoc}

Accessors

  • get numberOfRunningTasks(): number
  • {@inheritDoc}

    Returns number

Methods

  • Hook executed after the worker task promise resolution. Can be overridden.

    Parameters

    • message: MessageValue<Response, unknown>

      The received message.

    • promise: PromiseWorkerResponseWrapper<Worker, Response>

      The Promise response.

    Returns void

  • {@inheritDoc}

    Type Parameters

    • Message

    Parameters

    • worker: Worker
    • listener: ((message: MessageValue<Message, unknown>) => void)
        • (message: MessageValue<Message, unknown>): void
        • Parameters

          • message: MessageValue<Message, unknown>

          Returns void

    Returns void

  • {@inheritDoc}

    Parameters

    • workerChoiceStrategy: "ROUND_ROBIN" | "LESS_RECENTLY_USED" | "FAIR_SHARE" | "WEIGHTED_ROUND_ROBIN"

    Returns void

  • This function is the listener registered for each worker.

    Returns

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

    Returns ((message: MessageValue<Response, unknown>) => void)

      • (message: MessageValue<Response, unknown>): void
      • This function is the listener registered for each worker.

        Returns

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

        Parameters

        • message: MessageValue<Response, unknown>

        Returns void

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