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.processor.aggregate;
018
019 import org.apache.camel.Exchange;
020
021 /**
022 * A strategy for aggregating two exchanges together into a single exchange.
023 * Possible implementations include performing some kind of combining or delta
024 * processing, such as adding line items together into an invoice or just using
025 * the newest exchange and removing old exchanges such as for state tracking or
026 * market data prices; where old values are of little use.
027 *
028 * @version $Revision: 630568 $
029 */
030 public interface AggregationStrategy {
031
032 /**
033 * Aggregates an old and new exchange together to create a single combined
034 * exchange
035 *
036 * @param oldExchange the oldest exchange
037 * @param newExchange the newest exchange
038 * @return a combined composite of the two exchanges
039 */
040 Exchange aggregate(Exchange oldExchange, Exchange newExchange);
041 }