001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.loanbroker.queue.version;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.Message;
021    import org.apache.camel.processor.aggregate.AggregationStrategy;
022    import org.apache.commons.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    
025    //START SNIPPET: aggregation
026    public class BankResponseAggregationStrategy implements AggregationStrategy {    
027        private static final transient Log LOG = LogFactory.getLog(BankResponseAggregationStrategy.class);
028        private boolean aggregatingOutMessage;
029        
030        public BankResponseAggregationStrategy setAggregatingOutMessage(boolean flag) {
031            aggregatingOutMessage = flag;
032            return this;
033        }
034        
035        // Here we put the bank response together
036        public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
037            LOG.debug("Get the exchange to aggregate, older: " + oldExchange + " newer:" + newExchange);
038    
039            // the first time we only have the new exchange
040            if (oldExchange == null) {
041                return newExchange;
042            }
043    
044            Message oldMessage;
045            Message newMessage;
046           
047            oldMessage = oldExchange.getIn();
048            newMessage = newExchange.getIn();
049    
050            Double oldRate = oldMessage.getHeader(Constants.PROPERTY_RATE, Double.class);
051            Double newRate = newMessage.getHeader(Constants.PROPERTY_RATE, Double.class);
052    
053            Exchange result;
054            if (newRate >= oldRate) {
055                result = oldExchange;
056            } else {
057                result = newExchange;
058            }
059    
060            LOG.debug("Get the lower rate exchange " + result);
061            return result;
062        }
063    
064    }
065    // END SNIPPET: aggregation