org.wso2.siddhi.core.query.selector.attribute.aggregator

Class DistinctcountAttributeAggregator

java.lang.Object

org.wso2.siddhi.core.query.selector.attribute.aggregator.AttributeAggregator

org.wso2.siddhi.core.query.selector.attribute.aggregator.DistinctcountAttributeAggregator

All Implemented Interfaces:

EternalReferencedHolder, Snapshotable

public class DistinctcountAttributeAggregator
extends AttributeAggregator

Field Summary

Fields inherited from class org.wso2.siddhi.core.query.selector.attribute.aggregator.AttributeAggregator

attributeExpressionExecutors, elementId, executionPlanContext

Constructor Summary

Constructors

Constructor and Description
DistinctcountAttributeAggregator()

Method Summary

Modifier and Type	Method and Description
Object[]	currentState() Used to collect the serializable state of the processing element, that need to be persisted for the reconstructing the element to the same state on a different point of time
org.wso2.siddhi.query.api.definition.Attribute.Type	getReturnType()
protected void	init(ExpressionExecutor[] attributeExpressionExecutors, ExecutionPlanContext executionPlanContext) The initialization method for FunctionExecutor
Object	processAdd(Object data)
Object	processAdd(Object[] data)
Object	processRemove(Object data)
Object	processRemove(Object[] data)
Object	reset()
void	restoreState(Object[] state) Used to restore serialized state of the processing element, for reconstructing the element to the same state as if was on a previous point of time.
void	start() This will be called only once and this can be used to acquire required resources for the processing element.
void	stop() This will be called only once and this can be used to release the acquired resources for processing.

Methods inherited from class org.wso2.siddhi.core.query.selector.attribute.aggregator.AttributeAggregator

cloneAggregator, getElementId, initAggregator, process

Methods inherited from class java.lang.Object

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

Constructor Detail

DistinctcountAttributeAggregator

public DistinctcountAttributeAggregator()

Method Detail

init

protected void init(ExpressionExecutor[] attributeExpressionExecutors,
                    ExecutionPlanContext executionPlanContext)

The initialization method for FunctionExecutor

Specified by:

init in class AttributeAggregator

Parameters:

attributeExpressionExecutors - are the executors of each attributes in the function

executionPlanContext - Execution plan runtime context

getReturnType

public org.wso2.siddhi.query.api.definition.Attribute.Type getReturnType()

Specified by:

getReturnType in class AttributeAggregator

processAdd

public Object processAdd(Object data)

Specified by:

processAdd in class AttributeAggregator

processAdd

public Object processAdd(Object[] data)

Specified by:

processAdd in class AttributeAggregator

processRemove

public Object processRemove(Object data)

Specified by:

processRemove in class AttributeAggregator

processRemove

public Object processRemove(Object[] data)

Specified by:

processRemove in class AttributeAggregator

reset

public Object reset()

Specified by:

reset in class AttributeAggregator

start

public void start()

Description copied from interface: EternalReferencedHolder

This will be called only once and this can be used to acquire required resources for the processing element. This will be called after initializing the system and before starting to process the events.

stop

public void stop()

Description copied from interface: EternalReferencedHolder

This will be called only once and this can be used to release the acquired resources for processing. This will be called before shutting down the system.

currentState

public Object[] currentState()

Description copied from interface: Snapshotable

Used to collect the serializable state of the processing element, that need to be persisted for the reconstructing the element to the same state on a different point of time

Returns:

stateful objects of the processing element as an array

restoreState

public void restoreState(Object[] state)

Description copied from interface: Snapshotable

Used to restore serialized state of the processing element, for reconstructing the element to the same state as if was on a previous point of time.

Parameters:

state - the stateful objects of the element as an array on the same order provided by currentState().