org.wso2.siddhi.core.query.processor.stream.window

Class WindowProcessor

java.lang.Object

org.wso2.siddhi.core.query.processor.stream.AbstractStreamProcessor

org.wso2.siddhi.core.query.processor.stream.window.WindowProcessor

All Implemented Interfaces:

Processor, EternalReferencedHolder, Snapshotable

Direct Known Subclasses:

AggregateWindowProcessor, BatchWindowProcessor, CronWindowProcessor, ExternalTimeBatchWindowProcessor, ExternalTimeWindowProcessor, FrequentWindowProcessor, LengthBatchWindowProcessor, LengthWindowProcessor, LossyFrequentWindowProcessor, SessionWindowProcessor, SortWindowProcessor, TableWindowProcessor, TimeBatchWindowProcessor, TimeLengthWindowProcessor, TimeWindowProcessor, WindowWindowProcessor

public abstract class WindowProcessor
extends AbstractStreamProcessor

Abstract parent implementation of Processor to represent Windows. Common window behaviors will be handled here through this class and different implementations should extend this

Field Summary

Fields inherited from class org.wso2.siddhi.core.query.processor.stream.AbstractStreamProcessor

additionalAttributes, attributeExpressionExecutors, attributeExpressionLength, complexEventPopulater, elementId, inputDefinition, nextProcessor, queryName, siddhiAppContext, streamEventCloner, streamEventClonerHolder

Constructor Summary

Constructors

Constructor and Description
WindowProcessor()

Method Summary

Modifier and Type	Method and Description
protected List<org.wso2.siddhi.query.api.definition.Attribute>	init(org.wso2.siddhi.query.api.definition.AbstractDefinition inputDefinition, ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader, SiddhiAppContext siddhiAppContext, boolean outputExpectsExpiredEvents) The init method of the StreamProcessor, this method will be called before other methods
protected abstract void	init(ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader, boolean outputExpectsExpiredEvents, SiddhiAppContext siddhiAppContext) The init method of the WindowProcessor, this method will be called before other methods
protected abstract void	process(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner) The main processing method that will be called upon event arrival
protected void	processEventChunk(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner, ComplexEventPopulater complexEventPopulater) The main processing method that will be called upon event arrival

Methods inherited from class org.wso2.siddhi.core.query.processor.stream.AbstractStreamProcessor

cloneProcessor, constructStreamEventPopulater, getElementId, getNextProcessor, initProcessor, process, setNextProcessor, setStreamEventCloner, setToLast

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.wso2.siddhi.core.util.extension.holder.EternalReferencedHolder

start, stop

Methods inherited from interface org.wso2.siddhi.core.util.snapshot.Snapshotable

currentState, restoreState

Constructor Detail

WindowProcessor

public WindowProcessor()

Method Detail

init

protected List<org.wso2.siddhi.query.api.definition.Attribute> init(org.wso2.siddhi.query.api.definition.AbstractDefinition inputDefinition,
                                                                    ExpressionExecutor[] attributeExpressionExecutors,
                                                                    ConfigReader configReader,
                                                                    SiddhiAppContext siddhiAppContext,
                                                                    boolean outputExpectsExpiredEvents)

Description copied from class: AbstractStreamProcessor

The init method of the StreamProcessor, this method will be called before other methods

Specified by:

init in class AbstractStreamProcessor

Parameters:

inputDefinition - the incoming stream definition

attributeExpressionExecutors - the executors of each function parameters

configReader - this hold the AbstractStreamProcessor extensions configuration reader.

siddhiAppContext - the context of the siddhi app

outputExpectsExpiredEvents - is output expects ExpiredEvents @return the additional output attributes introduced by the function

Returns:

list of attributes.

init

protected abstract void init(ExpressionExecutor[] attributeExpressionExecutors,
                             ConfigReader configReader,
                             boolean outputExpectsExpiredEvents,
                             SiddhiAppContext siddhiAppContext)

The init method of the WindowProcessor, this method will be called before other methods

Parameters:

attributeExpressionExecutors - the executors of each function parameters

configReader - the config reader of window

outputExpectsExpiredEvents - is expired event out put or not

siddhiAppContext - the context of the siddhi app

processEventChunk

protected void processEventChunk(ComplexEventChunk<StreamEvent> streamEventChunk,
                                 Processor nextProcessor,
                                 StreamEventCloner streamEventCloner,
                                 ComplexEventPopulater complexEventPopulater)

Description copied from class: AbstractStreamProcessor

The main processing method that will be called upon event arrival

Specified by:

processEventChunk in class AbstractStreamProcessor

Parameters:

streamEventChunk - the event chunk that need to be processed

nextProcessor - the next processor to which the success events need to be passed

streamEventCloner - helps to clone the incoming event for local storage or modification

complexEventPopulater - helps to populate the events with the resultant attributes

process

protected abstract void process(ComplexEventChunk<StreamEvent> streamEventChunk,
                                Processor nextProcessor,
                                StreamEventCloner streamEventCloner)

The main processing method that will be called upon event arrival

Parameters:

streamEventChunk - the stream event chunk that need to be processed

nextProcessor - the next processor to which the success events need to be passed

streamEventCloner - helps to clone the incoming event for local storage or modification