Package org.apache.iotdb.udf.api.customizer.strategy

Class RowByRowAccessStrategy

java.lang.Object

org.apache.iotdb.udf.api.customizer.strategy.RowByRowAccessStrategy

All Implemented Interfaces:

AccessStrategy

public class RowByRowAccessStrategy
extends java.lang.Object
implements AccessStrategy

Used in UDTF.beforeStart(UDFParameters, UDTFConfigurations).

When the access strategy of a UDTF is set to an instance of this class, the method UDTF.transform(Row, PointCollector) of the UDTF will be called to transform the original data. You need to override the method in your own UDTF class.

Each call of the method UDTF.transform(Row, PointCollector) processes only one row (aligned by time) of the original data and can generate any number of data points.

Sample code:

{@code

See Also:

UDTF, UDTFConfigurations

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.iotdb.udf.api.customizer.strategy.AccessStrategy

AccessStrategy.AccessStrategyType

Constructor Summary

Constructors

Constructor	Description
RowByRowAccessStrategy()

Method Summary

Modifier and Type	Method	Description
void	check()	Used by the system to check the access strategy.
AccessStrategy.AccessStrategyType	getAccessStrategyType()	Returns the actual access strategy type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RowByRowAccessStrategy

public RowByRowAccessStrategy()

Method Detail

check

public void check()

Description copied from interface: AccessStrategy

Used by the system to check the access strategy.

Specified by:

check in interface AccessStrategy

getAccessStrategyType

public AccessStrategy.AccessStrategyType getAccessStrategyType()

Description copied from interface: AccessStrategy

Returns the actual access strategy type.

Specified by:

getAccessStrategyType in interface AccessStrategy

Returns:

the actual access strategy type