com.espertech.esper.epl.join.base

Class JoinSetComposerHistoricalImpl

java.lang.Object

com.espertech.esper.epl.join.base.JoinSetComposerHistoricalImpl

All Implemented Interfaces:

JoinSetComposer

public class JoinSetComposerHistoricalImpl
extends Object
implements JoinSetComposer

Implements the function to determine a join result set using tables/indexes and query strategy instances for each stream.

Constructor Summary

Constructors

Constructor and Description
JoinSetComposerHistoricalImpl(boolean allowInitIndex, Map<TableLookupIndexReqKey,EventTable>[] repositories, QueryStrategy[] queryStrategies, Viewable[] streamViews, ExprEvaluatorContext staticEvalExprEvaluatorContext)

Method Summary

Modifier and Type	Method and Description
boolean	allowsInit() Returns true whether initialization events per stream to populate join indexes can be processed (init method).
void	destroy() Destroy stateful index tables, if any.
protected QueryStrategy[]	getQueryStrategies() Returns query strategies.
protected EventTable[][]	getTables() Returns tables.
void	init(EventBean[][] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext) Provides initialization events per stream to composer to populate join indexes, if required
UniformPair<Set<MultiKey<EventBean>>>	join(EventBean[][] newDataPerStream, EventBean[][] oldDataPerStream, ExprEvaluatorContext exprEvaluatorContext) Return join tuple result set from new data and old data for each stream.
Set<MultiKey<EventBean>>	staticJoin() For use in iteration over join statements, this must build a join tuple result set from all events in indexes, executing query strategies for each.
void	visitIndexes(StatementAgentInstancePostLoadIndexVisitor visitor)

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinSetComposerHistoricalImpl

public JoinSetComposerHistoricalImpl(boolean allowInitIndex,
                                     Map<TableLookupIndexReqKey,EventTable>[] repositories,
                                     QueryStrategy[] queryStrategies,
                                     Viewable[] streamViews,
                                     ExprEvaluatorContext staticEvalExprEvaluatorContext)

Method Detail

allowsInit

public boolean allowsInit()

Description copied from interface: JoinSetComposer

Returns true whether initialization events per stream to populate join indexes can be processed (init method).

Specified by:

allowsInit in interface JoinSetComposer

Returns:

whether init is supported

init

public void init(EventBean[][] eventsPerStream,
                 ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: JoinSetComposer

Provides initialization events per stream to composer to populate join indexes, if required

Specified by:

init in interface JoinSetComposer

Parameters:

eventsPerStream - is an array of events for each stream, with null elements to indicate no events for a stream

exprEvaluatorContext - evaluator context

destroy

public void destroy()

Description copied from interface: JoinSetComposer

Destroy stateful index tables, if any.

Specified by:

destroy in interface JoinSetComposer

join

public UniformPair<Set<MultiKey<EventBean>>> join(EventBean[][] newDataPerStream,
                                                  EventBean[][] oldDataPerStream,
                                                  ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: JoinSetComposer

Return join tuple result set from new data and old data for each stream.

Specified by:

join in interface JoinSetComposer

Parameters:

newDataPerStream - - for each stream the event array (can be null).

oldDataPerStream - - for each stream the event array (can be null).

exprEvaluatorContext - expression evaluation context

Returns:

join tuples

getTables

protected EventTable[][] getTables()

Returns tables.

Returns:

tables for stream.

getQueryStrategies

protected QueryStrategy[] getQueryStrategies()

Returns query strategies.

Returns:

query strategies

staticJoin

public Set<MultiKey<EventBean>> staticJoin()

Description copied from interface: JoinSetComposer

For use in iteration over join statements, this must build a join tuple result set from all events in indexes, executing query strategies for each.

Specified by:

staticJoin in interface JoinSetComposer

Returns:

static join result

visitIndexes

public void visitIndexes(StatementAgentInstancePostLoadIndexVisitor visitor)

Specified by:

visitIndexes in interface JoinSetComposer