/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.epl.named;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.ArrayEventIterator;
import com.espertech.esper.collection.MultiKey;
import com.espertech.esper.collection.UniformPair;
import com.espertech.esper.epl.core.ResultSetProcessor;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.lookup.SubordWMatchExprLookupStrategy;
import com.espertech.esper.epl.spec.OnTriggerType;
import com.espertech.esper.epl.table.mgmt.TableStateInstance;
import com.espertech.esper.event.EventBeanUtility;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;
import com.espertech.esper.util.AuditPath;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* View for the on-select statement that handles selecting events from a named window.
*/
public class NamedWindowOnSelectView extends NamedWindowOnExprBaseView {
private final NamedWindowOnSelectViewFactory parent;
private final ResultSetProcessor resultSetProcessor;
private EventBean[] lastResult;
private Set<MultiKey<EventBean>> oldEvents = new HashSet<MultiKey<EventBean>>();
private final boolean audit;
private final boolean isDelete;
private final TableStateInstance tableStateInstanceInsertInto;
public NamedWindowOnSelectView(SubordWMatchExprLookupStrategy lookupStrategy, NamedWindowRootViewInstance rootView, ExprEvaluatorContext exprEvaluatorContext, NamedWindowOnSelectViewFactory parent, ResultSetProcessor resultSetProcessor, boolean audit, boolean isDelete, TableStateInstance tableStateInstanceInsertInto) {
super(lookupStrategy, rootView, exprEvaluatorContext);
this.parent = parent;
this.resultSetProcessor = resultSetProcessor;
this.audit = audit;
this.isDelete = isDelete;
this.tableStateInstanceInsertInto = tableStateInstanceInsertInto;
}
public void handleMatching(EventBean[] triggerEvents, EventBean[] matchingEvents) {
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().qInfraOnAction(OnTriggerType.ON_SELECT, triggerEvents, matchingEvents);
}
EventBean[] newData;
// clear state from prior results
resultSetProcessor.clear();
// build join result
// use linked hash set to retain order of join results for last/first/window to work most intuitively
Set<MultiKey<EventBean>> newEvents = buildJoinResult(triggerEvents, matchingEvents);
// process matches
UniformPair<EventBean[]> pair = resultSetProcessor.processJoinResult(newEvents, oldEvents, false);
newData = pair != null ? pair.getFirst() : null;
if (parent.isDistinct()) {
newData = EventBeanUtility.getDistinctByProp(newData, parent.getEventBeanReader());
}
if (tableStateInstanceInsertInto != null) {
if (newData != null) {
for (EventBean aNewData : newData) {
if (audit) {
AuditPath.auditInsertInto(getExprEvaluatorContext().getEngineURI(), getExprEvaluatorContext().getStatementName(), aNewData);
}
tableStateInstanceInsertInto.addEventUnadorned(aNewData);
}
}
} else if (parent.getInternalEventRouter() != null) {
if (newData != null) {
for (EventBean aNewData : newData) {
if (audit) {
AuditPath.auditInsertInto(getExprEvaluatorContext().getEngineURI(), getExprEvaluatorContext().getStatementName(), aNewData);
}
parent.getInternalEventRouter().route(aNewData, parent.getStatementHandle(), parent.getInternalEventRouteDest(), getExprEvaluatorContext(), parent.isAddToFront());
}
}
}
// The on-select listeners receive the events selected
if ((newData != null) && (newData.length > 0)) {
// And post only if we have listeners/subscribers that need the data
if (parent.getStatementResultService().isMakeNatural() || parent.getStatementResultService().isMakeSynthetic()) {
updateChildren(newData, null);
}
}
lastResult = newData;
// clear state from prior results
resultSetProcessor.clear();
// Events to delete are indicated via old data
if (isDelete) {
this.rootView.update(null, matchingEvents);
}
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().aInfraOnAction();
}
}
public static Set<MultiKey<EventBean>> buildJoinResult(EventBean[] triggerEvents, EventBean[] matchingEvents) {
LinkedHashSet events = new LinkedHashSet<MultiKey<EventBean>>();
for (int i = 0; i < triggerEvents.length; i++) {
EventBean triggerEvent = triggerEvents[0];
if (matchingEvents != null) {
for (int j = 0; j < matchingEvents.length; j++) {
EventBean[] eventsPerStream = new EventBean[2];
eventsPerStream[0] = matchingEvents[j];
eventsPerStream[1] = triggerEvent;
events.add(new MultiKey<EventBean>(eventsPerStream));
}
}
}
return events;
}
public EventType getEventType() {
if (resultSetProcessor != null) {
return resultSetProcessor.getResultEventType();
} else {
return rootView.getEventType();
}
}
public Iterator<EventBean> iterator() {
return new ArrayEventIterator(lastResult);
}
}