/* *************************************************************************************** * 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.EPStatement; import com.espertech.esper.client.EventBean; import com.espertech.esper.collection.UniformPair; import com.espertech.esper.epl.core.EngineImportService; import com.espertech.esper.event.NaturalEventBean; import net.sf.cglib.reflect.FastClass; import net.sf.cglib.reflect.FastMethod; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; /** * A result delivery strategy that uses an "update" method that accepts a pair of map array. */ public class ResultDeliveryStrategyMap implements ResultDeliveryStrategy { private static Logger log = LoggerFactory.getLogger(ResultDeliveryStrategyMap.class); protected final EPStatement statement; protected final Object subscriber; protected final FastMethod fastMethod; protected final String[] columnNames; /** * Ctor. * * @param subscriber the object to deliver to * @param method the delivery method * @param columnNames the column names for the map * @param statement statement * @param engineImportService engine imports */ public ResultDeliveryStrategyMap(EPStatement statement, Object subscriber, Method method, String[] columnNames, EngineImportService engineImportService) { this.statement = statement; this.subscriber = subscriber; FastClass fastClass = FastClass.create(engineImportService.getFastClassClassLoader(subscriber.getClass()), subscriber.getClass()); this.fastMethod = fastClass.getMethod(method); this.columnNames = columnNames; } public void execute(UniformPair<EventBean[]> result) { Map[] newData; Map[] oldData; if (result == null) { newData = null; oldData = null; } else { newData = convert(result.getFirst()); oldData = convert(result.getSecond()); } Object[] parameters = new Object[]{newData, oldData}; try { fastMethod.invoke(subscriber, parameters); } catch (InvocationTargetException e) { ResultDeliveryStrategyImpl.handle(statement.getName(), log, e, parameters, subscriber, fastMethod); } } protected Map[] convert(EventBean[] events) { if ((events == null) || (events.length == 0)) { return null; } Map[] result = new Map[events.length]; int length = 0; for (int i = 0; i < result.length; i++) { if (events[i] instanceof NaturalEventBean) { NaturalEventBean natural = (NaturalEventBean) events[i]; result[length] = convert(natural); length++; } } if (length == 0) { return null; } if (length != events.length) { Map[] reduced = new Map[length]; System.arraycopy(result, 0, reduced, 0, length); result = reduced; } return result; } private Map convert(NaturalEventBean natural) { Map<String, Object> map = new HashMap<String, Object>(); Object[] columns = natural.getNatural(); for (int i = 0; i < columns.length; i++) { map.put(columnNames[i], columns[i]); } return map; } }