Class VariableHistorian

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Hierarchy

VariableHistorian

Implements

IVariableHistorian

Index

Constructors

constructor

Methods

Constructors

constructor

new VariableHistorian(node: UAVariable, options: IVariableHistorianOptions): VariableHistorian

- Defined in packages/node-opcua-address-space/source/address_space_ts.ts:2535
Parameters
- node: UAVariable
- options: IVariableHistorianOptions
Returns VariableHistorian

Methods

extractDataValues

extractDataValues(historyReadRawModifiedDetails: ReadRawModifiedDetails, maxNumberToExtract: number, isReversed: boolean, reverseDataValue: boolean, callback: (err: Error, dataValue?: DataValue[]) => void): void

- Defined in packages/node-opcua-address-space/source/address_space_ts.ts:2554
Extract a series of dataValue from the History database for this value

Parameters
- historyReadRawModifiedDetails: ReadRawModifiedDetails
- maxNumberToExtract: number
- isReversed: boolean
- reverseDataValue: boolean
- callback: (err: Error, dataValue?: DataValue[]) => void
  - - (err: Error, dataValue?: DataValue[]): void
    - Parameters
      - err: Error
      - Optional dataValue: DataValue[]
      Returns void
Returns void

push

push(newDataValue: DataValue): Promise<void>

Implementation of IVariableHistorian.push
- Defined in packages/node-opcua-address-space/source/address_space_ts.ts:2544
push a new value into the history for this variable the method should take a very small amount of time and not directly write to the underlying database

Parameters
- newDataValue: DataValue
Returns Promise<void>

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