io.siddhi.core.query.processor.stream.window

Class WindowWindowProcessor

java.lang.Object

io.siddhi.core.query.processor.stream.AbstractStreamProcessor<S>

io.siddhi.core.query.processor.stream.window.WindowProcessor

io.siddhi.core.query.processor.stream.window.WindowWindowProcessor

All Implemented Interfaces:

Processor, FindableProcessor, ExternalReferencedHolder

public class WindowWindowProcessor
extends WindowProcessor
implements FindableProcessor

This is the WindowProcessor intended to be used with window join queries. This processor keeps a reference of the Window and directly find the items from the Window. The process method just passes the events to the next JoinProcessor inorder to handle the events there.

Field Summary

Fields inherited from class io.siddhi.core.query.processor.stream.AbstractStreamProcessor

attributeExpressionExecutors, attributeExpressionLength, complexEventPopulater, inputDefinition, metaStreamEvent, nextProcessor, siddhiQueryContext, stateHolder, streamEventClonerHolder

Constructor Summary

Constructors

Constructor and Description
WindowWindowProcessor(Window window)

Method Summary

Modifier and Type	Method and Description
CompiledCondition	compileCondition(io.siddhi.query.api.expression.Expression condition, MatchingMetaInfoHolder matchingMetaInfoHolder, List<VariableExpressionExecutor> variableExpressionExecutors, Map<String,Table> tableMap, SiddhiQueryContext siddhiQueryContext) To construct a finder having the capability of finding events at the processor that corresponds to the incoming matchingEvent and the given matching expression logic.
StreamEvent	find(StateEvent matchingEvent, CompiledCondition compiledCondition) To find events from the processor event pool, that the matches the matchingEvent based on finder logic.
ProcessingMode	getProcessingMode() Defines the behaviour of the processing, will be called after the init
protected StateFactory	init(MetaStreamEvent metaStreamEvent, io.siddhi.query.api.definition.AbstractDefinition inputDefinition, ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader, StreamEventClonerHolder streamEventClonerHolder, boolean outputExpectsExpiredEvents, boolean findToBeExecuted, SiddhiQueryContext siddhiQueryContext) The init method of the StreamProcessor, this method will be called before other methods
protected void	processEventChunk(ComplexEventChunk streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner, ComplexEventPopulater complexEventPopulater, State state) The main processing method that will be called upon event arrival
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 io.siddhi.core.query.processor.stream.window.WindowProcessor

getReturnAttributes

Methods inherited from class io.siddhi.core.query.processor.stream.AbstractStreamProcessor

constructStreamEventPopulater, getNextProcessor, initProcessor, isStateful, process, process, setNextProcessor, setStreamEventCloner, setToLast

Methods inherited from class java.lang.Object

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

Constructor Detail

WindowWindowProcessor

public WindowWindowProcessor(Window window)

Method Detail

init

protected StateFactory init(MetaStreamEvent metaStreamEvent,
                            io.siddhi.query.api.definition.AbstractDefinition inputDefinition,
                            ExpressionExecutor[] attributeExpressionExecutors,
                            ConfigReader configReader,
                            StreamEventClonerHolder streamEventClonerHolder,
                            boolean outputExpectsExpiredEvents,
                            boolean findToBeExecuted,
                            SiddhiQueryContext siddhiQueryContext)

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:

metaStreamEvent - the stream event meta

inputDefinition - the incoming stream definition

attributeExpressionExecutors - the executors of each function parameters

configReader - this hold the AbstractStreamProcessor extensions configuration

streamEventClonerHolder - stream event cloner holder

outputExpectsExpiredEvents - is expired events sent as output

findToBeExecuted - find will be executed

siddhiQueryContext - current siddhi query context

processEventChunk

protected void processEventChunk(ComplexEventChunk streamEventChunk,
                                 Processor nextProcessor,
                                 StreamEventCloner streamEventCloner,
                                 ComplexEventPopulater complexEventPopulater,
                                 State state)

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

state - current state of the processor

find

public StreamEvent find(StateEvent matchingEvent,
                        CompiledCondition compiledCondition)

Description copied from interface: FindableProcessor

To find events from the processor event pool, that the matches the matchingEvent based on finder logic.

Specified by:

find in interface FindableProcessor

Parameters:

matchingEvent - the event to be matched with the events at the processor

compiledCondition - the execution element responsible for matching the corresponding events that matches the matchingEvent based on pool of events at Processor

Returns:

the matched events

compileCondition

public CompiledCondition compileCondition(io.siddhi.query.api.expression.Expression condition,
                                          MatchingMetaInfoHolder matchingMetaInfoHolder,
                                          List<VariableExpressionExecutor> variableExpressionExecutors,
                                          Map<String,Table> tableMap,
                                          SiddhiQueryContext siddhiQueryContext)

Description copied from interface: FindableProcessor

To construct a finder having the capability of finding events at the processor that corresponds to the incoming matchingEvent and the given matching expression logic.

Specified by:

compileCondition in interface FindableProcessor

Parameters:

condition - the matching condition

matchingMetaInfoHolder - the meta structure of the incoming matchingEvent

variableExpressionExecutors - the list of variable ExpressionExecutors already created

tableMap - map of event tables

siddhiQueryContext - current siddhi query context

Returns:

compiled Condition having the capability of matching events against the incoming matchingEvent

start

public void start()

Description copied from interface: ExternalReferencedHolder

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.

Specified by:

start in interface ExternalReferencedHolder

stop

public void stop()

Description copied from interface: ExternalReferencedHolder

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.

Specified by:

stop in interface ExternalReferencedHolder

getProcessingMode

public ProcessingMode getProcessingMode()

Description copied from class: AbstractStreamProcessor

Defines the behaviour of the processing, will be called after the init

Specified by:

getProcessingMode in class AbstractStreamProcessor

Returns:

ProcessingMode processing mode of the processor