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

Class LengthWindowProcessor

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.SlidingWindowProcessor<S>

io.siddhi.core.query.processor.stream.window.SlidingFindableWindowProcessor<io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState>

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

All Implemented Interfaces:

Processor, FindableProcessor, ExternalReferencedHolder

public class LengthWindowProcessor
extends SlidingFindableWindowProcessor<io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState>

Implementation of WindowProcessor which represent a Window operating based on a pre-defined length.

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
LengthWindowProcessor()

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, io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState state, 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, StreamEventCloner streamEventCloner, io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState state) To find events from the processor event pool, that the matches the matchingEvent based on finder logic.
int	getLength()
protected StateFactory	init(ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader, SiddhiQueryContext siddhiQueryContext) The init method of the WindowProcessor, this method will be called before other methods
protected void	process(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner, io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState state) The main processing method that will be called upon event arrival
void	setLength(int length)
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.SlidingFindableWindowProcessor

compileCondition, find

Methods inherited from class io.siddhi.core.query.processor.stream.window.SlidingWindowProcessor

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

LengthWindowProcessor

public LengthWindowProcessor()

Method Detail

getLength

public int getLength()

setLength

public void setLength(int length)

init

protected StateFactory init(ExpressionExecutor[] attributeExpressionExecutors,
                            ConfigReader configReader,
                            SiddhiQueryContext siddhiQueryContext)

Description copied from class: SlidingWindowProcessor

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

Specified by:

init in class SlidingWindowProcessor<io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState>

Parameters:

attributeExpressionExecutors - the executors of each function parameters

configReader - the config reader of window

siddhiQueryContext - the context of the siddhi query

process

protected void process(ComplexEventChunk<StreamEvent> streamEventChunk,
                       Processor nextProcessor,
                       StreamEventCloner streamEventCloner,
                       io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState state)

Description copied from class: SlidingWindowProcessor

The main processing method that will be called upon event arrival

Specified by:

process in class SlidingWindowProcessor<io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState>

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 query state

compileCondition

public CompiledCondition compileCondition(io.siddhi.query.api.expression.Expression condition,
                                          MatchingMetaInfoHolder matchingMetaInfoHolder,
                                          List<VariableExpressionExecutor> variableExpressionExecutors,
                                          Map<String,Table> tableMap,
                                          io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState state,
                                          SiddhiQueryContext siddhiQueryContext)

Description copied from class: SlidingFindableWindowProcessor

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 class SlidingFindableWindowProcessor<io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState>

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

state - current query state

siddhiQueryContext - current siddhi query context

Returns:

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

find

public StreamEvent find(StateEvent matchingEvent,
                        CompiledCondition compiledCondition,
                        StreamEventCloner streamEventCloner,
                        io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState state)

Description copied from class: SlidingFindableWindowProcessor

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

Specified by:

find in class SlidingFindableWindowProcessor<io.siddhi.core.query.processor.stream.window.LengthWindowProcessor.WindowState>

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

streamEventCloner - stream event cloner

state - current query state @return the matched events

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.

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.