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

Class AggregateWindowProcessor

java.lang.Object

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

io.siddhi.core.query.processor.stream.window.WindowProcessor<S>

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

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

All Implemented Interfaces:

Processor, FindableProcessor, ExternalReferencedHolder

public class AggregateWindowProcessor
extends BatchingWindowProcessor
implements FindableProcessor

This is the WindowProcessor intended to be used with aggregate join queries. This processor keeps a reference of the Aggregate and finds the items from that. 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	Description
AggregateWindowProcessor(AggregationRuntime aggregationRuntime, io.siddhi.query.api.aggregation.Within within, io.siddhi.query.api.expression.Expression per, List<io.siddhi.query.api.expression.Variable> queryGroupByList)

Method Summary

Modifier and Type	Method	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.
protected StateFactory	init(ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader, StreamEventClonerHolder streamEventClonerHolder, boolean outputExpectsExpiredEvents, boolean findToBeExecuted, SiddhiQueryContext siddhiQueryContext)	The init method of the WindowProcessor, this method will be called before other methods
protected void	process(ComplexEventChunk streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner, 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.BatchingWindowProcessor

getProcessingMode, init, processEventChunk

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

AggregateWindowProcessor

public AggregateWindowProcessor(AggregationRuntime aggregationRuntime,
                                io.siddhi.query.api.aggregation.Within within,
                                io.siddhi.query.api.expression.Expression per,
                                List<io.siddhi.query.api.expression.Variable> queryGroupByList)

Method Detail

init

protected StateFactory init(ExpressionExecutor[] attributeExpressionExecutors,
                            ConfigReader configReader,
                            StreamEventClonerHolder streamEventClonerHolder,
                            boolean outputExpectsExpiredEvents,
                            boolean findToBeExecuted,
                            SiddhiQueryContext siddhiQueryContext)

Description copied from class: BatchingWindowProcessor

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

Specified by:

init in class BatchingWindowProcessor

Parameters:

attributeExpressionExecutors - the executors of each function parameters

configReader - the config reader of window

streamEventClonerHolder - stream event cloner holder

outputExpectsExpiredEvents - is expired events sent as output

findToBeExecuted - find operation will be performed

siddhiQueryContext - the context of the siddhi query

process

protected void process(ComplexEventChunk streamEventChunk,
                       Processor nextProcessor,
                       StreamEventCloner streamEventCloner,
                       State state)

Description copied from class: BatchingWindowProcessor

The main processing method that will be called upon event arrival

Specified by:

process in class BatchingWindowProcessor

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

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