Class VariableHistorian

Implements

IVariableHistorian

Index

Constructors

Methods

extractDataValues push

Constructors

constructor

new VariableHistorian(
node: UAVariable,
options: IVariableHistorianOptions,
): VariableHistorian
Parameters
- node: UAVariable
- options: IVariableHistorianOptions
Returns VariableHistorian
- Defined in packages/node-opcua-address-space/dist/source/address_space_ts.d.ts:93

Methods

extractDataValues

extractDataValues(
    historyReadRawModifiedDetails: ReadRawModifiedDetails,
    maxNumberToExtract: number,
    isReversed: boolean,
    reverseDataValue: boolean,
    callback: (err: Error | null, dataValue?: DataValue[]) => void,
): void
Extract a series of dataValue from the History database for this value
Parameters
- historyReadRawModifiedDetails: ReadRawModifiedDetails
- maxNumberToExtract: number
- isReversed: boolean
- reverseDataValue: boolean
- callback: (err: Error | null, dataValue?: DataValue[]) => void
Returns void
Implementation of IVariableHistorian.extractDataValues
- Defined in packages/node-opcua-address-space/dist/source/address_space_ts.d.ts:109

push

push(newDataValue: DataValue): Promise<void>
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>
Implementation of IVariableHistorian.push
- Defined in packages/node-opcua-address-space/dist/source/address_space_ts.d.ts:100