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Interface IPool<Worker, Data, Response>

Contract definition for a poolifier pool.

Type Parameters

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Worker extends IWorker
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Type of worker which manages this pool.
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Data = unknown
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Type of data sent to the worker. This can only be structured-cloneable data.
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Response = unknown
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Type of execution response. This can only be structured-cloneable data.
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Hierarchy

IPool

Implemented by

AbstractPool

Index

Properties

destroy +IPool | poolifier - v3.0.11

Interface IPool<Worker, Data, Response>

Contract definition for a poolifier pool.

interface IPool {
Â Â Â Â addTaskFunction: ((name, fn) => Promise<boolean>);
Â Â Â Â destroy: (() => Promise<void>);
Â Â Â Â emitter?: EventEmitterAsyncResource;
Â Â Â Â enableTasksQueue: ((enable, tasksQueueOptions?) => void);
Â Â Â Â execute: ((data?, name?, transferList?) => Promise<Response>);
Â Â Â Â hasTaskFunction: ((name) => boolean);
Â Â Â Â hasWorkerNodeBackPressure: ((workerNodeKey) => boolean);
Â Â Â Â info: PoolInfo;
Â Â Â Â listTaskFunctionNames: (() => string[]);
Â Â Â Â removeTaskFunction: ((name) => Promise<boolean>);
Â Â Â Â setDefaultTaskFunction: ((name) => Promise<boolean>);
Â Â Â Â setTasksQueueOptions: ((tasksQueueOptions) => void);
Â Â Â Â setWorkerChoiceStrategy: ((workerChoiceStrategy, workerChoiceStrategyOptions?) => void);
Â Â Â Â setWorkerChoiceStrategyOptions: ((workerChoiceStrategyOptions) => void);
Â Â Â Â start: (() => void);
Â Â Â Â workerNodes: IWorkerNode<Worker, Data>[];
}

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.
+

Implemented by

AbstractPool

Index

Properties

addTaskFunction +destroy emitter? enableTasksQueue execute +hasTaskFunction hasWorkerNodeBackPressure info -listTaskFunctions +listTaskFunctionNames +removeTaskFunction +setDefaultTaskFunction setTasksQueueOptions setWorkerChoiceStrategy setWorkerChoiceStrategyOptions +start workerNodes -

Properties

`Readonly` destroy

destroy: (() => Promise<void>)

Type declaration

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- (): Promise<void>
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  Terminates all workers in this pool.
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  Returns Promise<void>
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`Optional` `Readonly` emitter

emitter?: PoolEmitter

Emitter on which events can be listened to.

Properties

`Readonly` addTaskFunction

addTaskFunction: ((name, fn) => Promise<boolean>)

Type declaration

- (name, fn): Promise<boolean>
- Adds a task function to this pool. +If a task function with the same name already exists, it will be overwritten.
  +
  Parameters
  - name: string
    The name of the task function.
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  - fn: TaskFunction<Data, Response>
    The task function.
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  Returns Promise<boolean>
  true if the task function was added, false otherwise.
  +
  Throws
  https://nodejs.org/api/errors.html#class-typeerror If the name parameter is not a string or an empty string.
  +
  Throws
  https://nodejs.org/api/errors.html#class-typeerror If the fn parameter is not a function.
  +

`Readonly` destroy

destroy: (() => Promise<void>)

Type declaration

- (): Promise<void>
- Terminates all workers in this pool.
  +
  Returns Promise<void>

`Optional` `Readonly` emitter

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.
'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).

`Readonly` enableTasksQueue

enableTasksQueue: ((enable, tasksQueueOptions?) => void)

Type declaration

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- (enable, tasksQueueOptions?): void
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  Enables/disables the worker node tasks queue in this pool.
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  Parameters
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    enable: boolean
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    Whether to enable or disable the worker node tasks queue.
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    Optional tasksQueueOptions: TasksQueueOptions
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    The worker node tasks queue options.
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    Optional
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  Returns void
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`Readonly` execute

execute: ((data?, name?, transferList?) => Promise<Response>)

Type declaration

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- (data?, name?, transferList?): Promise<Response>
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  Executes the specified function in the worker constructor with the task data input parameter.
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  Parameters
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    Optional data: Data
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    The optional task input data for the specified task function. This can only be structured-cloneable data.
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    Optional
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    Optional name: string
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    The optional name of the task function to execute. If not specified, the default task function will be executed.
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    Optional
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    Optional transferList: TransferListItem[]
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    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.
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    Optional
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  Returns Promise<Response>
  Promise that will be fulfilled when the task is completed.
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`Readonly` hasWorkerNodeBackPressure

hasWorkerNodeBackPressure: ((workerNodeKey) => boolean)

Type declaration

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- (workerNodeKey): boolean
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  Whether the worker node has back pressure (i.e. its tasks queue is full).
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  Parameters
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    workerNodeKey: number
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    The worker node key.
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  Returns boolean
  true if the worker node has back pressure, false otherwise.
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`Readonly` info

info: PoolInfo

Pool information.

`Readonly` listTaskFunctions

listTaskFunctions: (() => string[])

Type declaration

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- (): string[]
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  Lists the names of task function available in this pool.
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  Returns string[]
  The names of task function available in this pool.
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`Readonly` setTasksQueueOptions

setTasksQueueOptions: ((tasksQueueOptions) => void)

Type declaration

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- (tasksQueueOptions): void
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  Sets the worker node tasks queue options in this pool.
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  Parameters
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    tasksQueueOptions: TasksQueueOptions
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    The worker node tasks queue options.
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  Returns void
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`Readonly` setWorkerChoiceStrategy

setWorkerChoiceStrategy: ((workerChoiceStrategy, workerChoiceStrategyOptions?) => void)

Type declaration

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- (workerChoiceStrategy, workerChoiceStrategyOptions?): void
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  Sets the worker choice strategy in this pool.
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  Parameters
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    workerChoiceStrategy: "ROUND_ROBIN" | "LEAST_USED" | "LEAST_BUSY" | "LEAST_ELU" | "FAIR_SHARE" | "WEIGHTED_ROUND_ROBIN" | "INTERLEAVED_WEIGHTED_ROUND_ROBIN"
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    The worker choice strategy.
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    Optional workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
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    The worker choice strategy options.
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    Optional
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  Returns void
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`Readonly` setWorkerChoiceStrategyOptions

setWorkerChoiceStrategyOptions: ((workerChoiceStrategyOptions) => void)

Type declaration

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- (workerChoiceStrategyOptions): void
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  Sets the worker choice strategy options in this pool.
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  Parameters
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    workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
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    The worker choice strategy options.
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  Returns void
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`Readonly` `Internal` workerNodes

workerNodes: IWorkerNode<Worker, Data>[]

Pool worker nodes.

Interface IPool<Worker, Data, Response>

Type Parameters

Worker extends IWorker

Data = unknown

Response = unknown

Hierarchy

Implemented by

Index

Properties

Interface IPool<Worker, Data, Response>

Type Parameters

Worker extends IWorker

Data = unknown

Response = unknown

Implemented by

Index

Properties

Properties

Readonly destroy

Type declaration

Returns Promise<void>

Optional Readonly emitter

Properties

Readonly addTaskFunction

Type declaration

Parameters

name: string

fn: TaskFunction<Data, Response>

Returns Promise<boolean>

Throws

Throws

Readonly destroy

Type declaration

Returns Promise<void>

Optional Readonly emitter

Readonly enableTasksQueue

Type declaration

Parameters

enable: boolean

Optional tasksQueueOptions: TasksQueueOptions

Returns void

Readonly execute

Type declaration

Parameters

Optional data: Data

Optional name: string

Optional transferList: TransferListItem[]

Returns Promise<Response>

Readonly hasWorkerNodeBackPressure

Type declaration

Parameters

workerNodeKey: number

Returns boolean

Readonly info

Readonly listTaskFunctions

Type declaration

Returns string[]

Readonly setTasksQueueOptions

Type declaration

Parameters

tasksQueueOptions: TasksQueueOptions

Returns void

Readonly setWorkerChoiceStrategy

Type declaration

Parameters

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

Optional workerChoiceStrategyOptions: WorkerChoiceStrategyOptions

Returns void

Readonly setWorkerChoiceStrategyOptions

Type declaration

Parameters

workerChoiceStrategyOptions: WorkerChoiceStrategyOptions

Returns void

Readonly Internal workerNodes

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Readonly enableTasksQueue

Type declaration

`Readonly` destroy

`Optional` `Readonly` emitter

`Readonly` addTaskFunction

`Readonly` destroy

`Optional` `Readonly` emitter

`Readonly` enableTasksQueue

`Optional` tasksQueueOptions: TasksQueueOptions

`Readonly` execute

`Optional` data: Data

`Optional` name: string

`Optional` transferList: TransferListItem[]

`Readonly` hasWorkerNodeBackPressure

`Readonly` info

`Readonly` listTaskFunctions

`Readonly` setTasksQueueOptions

`Readonly` setWorkerChoiceStrategy

`Optional` workerChoiceStrategyOptions: WorkerChoiceStrategyOptions

`Readonly` setWorkerChoiceStrategyOptions

`Readonly` `Internal` workerNodes

`Readonly` enableTasksQueue

`Optional` tasksQueueOptions: TasksQueueOptions

`Readonly` execute

`Optional` data: Data

`Optional` name: string

`Optional` transferList: TransferListItem[]

`Readonly` hasTaskFunction

`Readonly` hasWorkerNodeBackPressure

`Readonly` info

`Readonly` listTaskFunctionNames

`Readonly` removeTaskFunction

`Readonly` setDefaultTaskFunction

`Readonly` setTasksQueueOptions

`Readonly` setWorkerChoiceStrategy

`Optional` workerChoiceStrategyOptions: WorkerChoiceStrategyOptions

`Readonly` setWorkerChoiceStrategyOptions

`Readonly` start

`Readonly` `Internal` workerNodes