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: 35332 $ 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 }