io.siddhi.core.query.selector.attribute.aggregator

Class AttributeAggregator

java.lang.Object

io.siddhi.core.query.selector.attribute.aggregator.AttributeAggregator

Direct Known Subclasses:

AndAttributeAggregator, AvgAttributeAggregator, CountAttributeAggregator, DistinctCountAttributeAggregator, MaxAttributeAggregator, MaxForeverAttributeAggregator, MinAttributeAggregator, MinForeverAttributeAggregator, OrAttributeAggregator, StdDevAttributeAggregator, SumAttributeAggregator, UnionSetAttributeAggregator

public abstract class AttributeAggregator
extends Object

Abstract parent class for attribute aggregators. Attribute aggregators are used to perform aggregate operations such as count, average, etc.

Field Summary

Fields

Modifier and Type	Field and Description
protected ExpressionExecutor[]	attributeExpressionExecutors

Constructor Summary

Constructors

Constructor and Description
AttributeAggregator()

Method Summary

Modifier and Type	Method and Description
abstract boolean	canDestroy()
void	clean()
AttributeAggregator	cloneAggregator(String key)
abstract Map<String,Object>	currentState()
abstract io.siddhi.query.api.definition.Attribute.Type	getReturnType()
protected abstract void	init(ExpressionExecutor[] attributeExpressionExecutors, ProcessingMode processingMode, boolean outputExpectsExpiredEvents, ConfigReader configReader, SiddhiQueryContext siddhiQueryContext) The initialization method for FunctionExecutor
void	initAggregator(ExpressionExecutor[] attributeExpressionExecutors, ProcessingMode processingMode, boolean outputExpectsExpiredEvents, ConfigReader configReader, SiddhiQueryContext siddhiQueryContext)
Object	process(ComplexEvent event)
abstract Object	processAdd(Object data)
abstract Object	processAdd(Object[] data)
abstract Object	processRemove(Object data)
abstract Object	processRemove(Object[] data)
abstract Object	reset()
abstract void	restoreState(Map<String,Object> state)

Methods inherited from class java.lang.Object

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

Field Detail

attributeExpressionExecutors

protected ExpressionExecutor[] attributeExpressionExecutors

Constructor Detail

AttributeAggregator

public AttributeAggregator()

Method Detail

initAggregator

public void initAggregator(ExpressionExecutor[] attributeExpressionExecutors,
                           ProcessingMode processingMode,
                           boolean outputExpectsExpiredEvents,
                           ConfigReader configReader,
                           SiddhiQueryContext siddhiQueryContext)

cloneAggregator

public AttributeAggregator cloneAggregator(String key)

process

public Object process(ComplexEvent event)

init

protected abstract void init(ExpressionExecutor[] attributeExpressionExecutors,
                             ProcessingMode processingMode,
                             boolean outputExpectsExpiredEvents,
                             ConfigReader configReader,
                             SiddhiQueryContext siddhiQueryContext)

The initialization method for FunctionExecutor

Parameters:

attributeExpressionExecutors - are the executors of each attributes in the function

processingMode - query processing mode

outputExpectsExpiredEvents - is expired events sent as output

configReader - this hold the AttributeAggregator extensions configuration reader.

siddhiQueryContext - Siddhi query runtime context

getReturnType

public abstract io.siddhi.query.api.definition.Attribute.Type getReturnType()

processAdd

public abstract Object processAdd(Object data)

processAdd

public abstract Object processAdd(Object[] data)

processRemove

public abstract Object processRemove(Object data)

processRemove

public abstract Object processRemove(Object[] data)

canDestroy

public abstract boolean canDestroy()

reset

public abstract Object reset()

currentState

public abstract Map<String,Object> currentState()

restoreState

public abstract void restoreState(Map<String,Object> state)

clean

public void clean()