com.espertech.esper.epl.join.base
Class JoinSetComposerStreamToWinImpl

java.lang.Object
  com.espertech.esper.epl.join.base.JoinSetComposerStreamToWinImpl

All Implemented Interfaces:

JoinSetComposer

public class JoinSetComposerStreamToWinImpl
extends java.lang.Object
implements JoinSetComposer

Implements the function to determine a join result for a unidirectional stream-to-window joins, in which a single stream's events are ever only evaluated using a query strategy.

Constructor Summary

JoinSetComposerStreamToWinImpl(java.util.Map<TableLookupIndexReqKey,EventTable>[] repositories, boolean isPureSelfJoin, int streamNumber, QueryStrategy queryStrategy, boolean[] selfJoinRepositoryResets)
Ctor.

Method Summary

void	destroy() Destroy stateful index tables, if any.
void	init(EventBean[][] eventsPerStream) Provides initialization events per stream to composer to populate join indexes, if required
UniformPair<java.util.Set<MultiKey<EventBean>>>	join(EventBean[][] newDataPerStream, EventBean[][] oldDataPerStream, ExprEvaluatorContext exprEvaluatorContext) Return join tuple result set from new data and old data for each stream.
java.util.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

JoinSetComposerStreamToWinImpl

public JoinSetComposerStreamToWinImpl(java.util.Map<TableLookupIndexReqKey,EventTable>[] repositories,
                                      boolean isPureSelfJoin,
                                      int streamNumber,
                                      QueryStrategy queryStrategy,
                                      boolean[] selfJoinRepositoryResets)

Ctor.

Parameters:

repositories - - for each stream an array of (indexed/unindexed) tables for lookup.

isPureSelfJoin - for self-joins

streamNumber - is the undirectional stream

queryStrategy - is the lookup query strategy for the stream

selfJoinRepositoryResets - indicators for any stream's table that reset after strategy executon

Method Detail

init

public void init(EventBean[][] eventsPerStream)

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

destroy

public void destroy()

Description copied from interface: JoinSetComposer

Destroy stateful index tables, if any.

Specified by:

destroy in interface JoinSetComposer

join

public UniformPair<java.util.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

staticJoin

public java.util.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