/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.OneEventCollection;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.epl.spec.OnTriggerType;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;
import java.util.Iterator;
/**
* View for the on-delete statement that handles removing events from a named window.
*/
public class NamedWindowOnUpdateView extends NamedWindowOnExprBaseView
{
private NamedWindowOnUpdateViewFactory parent;
private EventBean[] lastResult;
public NamedWindowOnUpdateView(NamedWindowLookupStrategy lookupStrategy, NamedWindowRootViewInstance rootView, ExprEvaluatorContext exprEvaluatorContext, NamedWindowOnUpdateViewFactory parent) {
super(lookupStrategy, rootView, exprEvaluatorContext);
this.parent = parent;
}
public void handleMatching(EventBean[] triggerEvents, EventBean[] matchingEvents)
{
if (InstrumentationHelper.ENABLED) { InstrumentationHelper.get().qNamedWindowOnAction(OnTriggerType.ON_UPDATE, triggerEvents, matchingEvents);}
if ((matchingEvents == null) || (matchingEvents.length == 0)){
if (InstrumentationHelper.ENABLED) { InstrumentationHelper.get().aNamedWindowOnAction();}
return;
}
EventBean[] eventsPerStream = new EventBean[3];
OneEventCollection newData = new OneEventCollection();
OneEventCollection oldData = new OneEventCollection();
for (EventBean triggerEvent : triggerEvents) {
eventsPerStream[1] = triggerEvent;
for (EventBean matchingEvent : matchingEvents) {
EventBean copy = parent.getUpdateHelper().update(matchingEvent, eventsPerStream, super.getExprEvaluatorContext());
newData.add(copy);
oldData.add(matchingEvent);
}
}
if (!newData.isEmpty())
{
// Events to delete are indicated via old data
this.rootView.update(newData.toArray(), oldData.toArray());
// The on-delete listeners receive the events deleted, but only if there is interest
if (parent.getStatementResultService().isMakeNatural() || parent.getStatementResultService().isMakeSynthetic()) {
updateChildren(newData.toArray(), oldData.toArray());
}
}
// Keep the last delete records
lastResult = matchingEvents;
if (InstrumentationHelper.ENABLED) { InstrumentationHelper.get().aNamedWindowOnAction();}
}
public EventType getEventType() {
return rootView.getEventType();
}
public Iterator<EventBean> iterator() {
return new ArrayEventIterator(lastResult);
}
}