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        
029        // Here we put the bank response together
030        public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
031            LOG.debug("Get the exchange to aggregate, older: " + oldExchange + " newer:" + newExchange);
032    
033            // the first time we only have the new exchange
034            if (oldExchange == null) {
035                return newExchange;
036            }
037    
038            Message oldMessage;
039            Message newMessage;
040           
041            oldMessage = oldExchange.getIn();
042            newMessage = newExchange.getIn();
043    
044            Double oldRate = oldMessage.getHeader(Constants.PROPERTY_RATE, Double.class);
045            Double newRate = newMessage.getHeader(Constants.PROPERTY_RATE, Double.class);
046    
047            Exchange result;
048            if (newRate >= oldRate) {
049                result = oldExchange;
050            } else {
051                result = newExchange;
052            }
053    
054            LOG.debug("Get the lower rate exchange " + result);
055            return result;
056        }
057    
058    }
059    // END SNIPPET: aggregation