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.servicemix.client;
018    
019    import javax.jbi.messaging.MessageExchange;
020    
021    /**
022     * A listener which is called when a message is available to be processed.
023     * 
024     * @version $Revision: $
025     */
026    public interface MessageListener {
027    
028        /**
029         * Processes the message. By the completion of this method call, without exceptions
030         * being thrown the message is assumed to be processed unless the status is updated
031         * on the exchange.
032         * 
033         * @param exchange
034         * @param message
035         * @throws Exception if the message could not be processed correctly
036         */
037        void onMessage(MessageExchange exchange, Message message) throws Exception;
038    }