/**************************************************************************************
* 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.core.service;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import net.sf.cglib.reflect.FastMethod;
import net.sf.cglib.reflect.FastClass;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.event.NaturalEventBean;
import com.espertech.esper.collection.UniformPair;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Array;
/**
* A result delivery strategy that uses an "update" method that accepts a underlying array
* for use in wildcard selection.
*/
public class ResultDeliveryStrategyTypeArr implements ResultDeliveryStrategy
{
private static Log log = LogFactory.getLog(ResultDeliveryStrategyImpl.class);
private final String statementName;
private final Object subscriber;
private final FastMethod fastMethod;
private final Class componentType;
/**
* Ctor.
* @param subscriber is the receiver to method invocations
* @param method is the method to deliver to
*/
public ResultDeliveryStrategyTypeArr(String statementName, Object subscriber, Method method)
{
this.statementName = statementName;
this.subscriber = subscriber;
FastClass fastClass = FastClass.create(Thread.currentThread().getContextClassLoader(), subscriber.getClass());
this.fastMethod = fastClass.getMethod(method);
componentType = method.getParameterTypes()[0].getComponentType();
}
public void execute(UniformPair<EventBean[]> result)
{
Object newData;
Object oldData;
if (result == null) {
newData = null;
oldData = null;
}
else {
newData = convert(result.getFirst());
oldData = convert(result.getSecond());
}
Object params[] = new Object[] {newData, oldData};
try {
fastMethod.invoke(subscriber, params);
}
catch (InvocationTargetException e) {
ResultDeliveryStrategyImpl.handle(statementName, log, e, params, subscriber, fastMethod);
}
}
private Object convert(EventBean[] events)
{
if ((events == null) || (events.length == 0))
{
return null;
}
Object array = Array.newInstance(componentType, events.length);
int length = 0;
for (int i = 0; i < events.length; i++)
{
if (events[i] instanceof NaturalEventBean)
{
NaturalEventBean natural = (NaturalEventBean) events[i];
Array.set(array, length, natural.getNatural()[0]);
length++;
}
}
if (length == 0)
{
return null;
}
if (length != events.length)
{
Object reduced = Array.newInstance(componentType, events.length);
System.arraycopy(array, 0, reduced, 0, length);
array = reduced;
}
return array;
}
}