/*
***************************************************************************************
* 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.core.service;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.event.NaturalEventBean;
import com.espertech.esper.util.CollectionUtil;
import com.espertech.esper.util.ExecutionPathDebugLog;
import com.espertech.esper.view.ViewSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Iterator;
/**
* View for use with pre-processing statement such as "update istream" for indicating previous and current event.
*/
public class InternalRoutePreprocessView extends ViewSupport {
private static final Logger log = LoggerFactory.getLogger(InternalRoutePreprocessView.class);
private final EventType eventType;
private final StatementResultService statementResultService;
/**
* Ctor.
*
* @param eventType the type of event to indicator
* @param statementResultService determines whether listeners or subscribers are attached.
*/
public InternalRoutePreprocessView(EventType eventType, StatementResultService statementResultService) {
this.eventType = eventType;
this.statementResultService = statementResultService;
}
public void update(EventBean[] newData, EventBean[] oldData) {
if ((ExecutionPathDebugLog.isDebugEnabled) && (log.isDebugEnabled())) {
log.debug(".update Received update, " +
" newData.length==" + ((newData == null) ? 0 : newData.length) +
" oldData.length==" + ((oldData == null) ? 0 : oldData.length));
}
}
public EventType getEventType() {
return eventType;
}
public Iterator<EventBean> iterator() {
return CollectionUtil.NULL_EVENT_ITERATOR;
}
/**
* Returns true if a subscriber or listener is attached.
*
* @return indicator
*/
public boolean isIndicate() {
return statementResultService.isMakeNatural() || statementResultService.isMakeSynthetic();
}
/**
* Indicate an modifed event and its previous version.
*
* @param newEvent modified event
* @param oldEvent previous version event
*/
public void indicate(EventBean newEvent, EventBean oldEvent) {
try {
if (statementResultService.isMakeNatural()) {
NaturalEventBean natural = new NaturalEventBean(eventType, new Object[]{newEvent.getUnderlying()}, newEvent);
NaturalEventBean naturalOld = new NaturalEventBean(eventType, new Object[]{oldEvent.getUnderlying()}, oldEvent);
this.updateChildren(new NaturalEventBean[]{natural}, new NaturalEventBean[]{naturalOld});
} else {
this.updateChildren(new EventBean[]{newEvent}, new EventBean[]{oldEvent});
}
} catch (RuntimeException ex) {
log.error("Unexpected error updating child view: " + ex.getMessage());
}
}
public StatementResultService getStatementResultService() {
return statementResultService;
}
}