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;
018    
019    /**
020     * An <b>asynchronous</b> processor which can process an {@link Exchange} in an asynchronous fashion
021     * and signal completion by invoking the {@link AsyncCallback}.
022     * <p/>
023     * For example {@link Producer} can implmenet this interface to support real asynchronous non blocking
024     * when using the {@link org.apache.camel.processor.SendAsyncProcessor}.
025     *
026     * @version $Revision: 834165 $
027     */
028    public interface AsyncProcessor extends Processor {
029    
030        /**
031         * Processes the message exchange
032         *
033         * @param exchange the message exchange
034         * @param callback the callback to invoke when data has been received and the {@link Exchange}
035         * is ready to be continued routed.
036         * @throws Exception if an internal processing error has occurred.
037         */
038        void process(Exchange exchange, AsyncCallback callback) throws Exception;
039    }