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 */ 017package org.apache.camel; 018 019/** 020 * The callback interface for an {@link AsyncProcessor} so that it can 021 * notify you when an {@link Exchange} is done. 022 * <p/> 023 * For example a {@link AsyncProcessor} should invoke the done method when the {@link Exchange} is ready 024 * to be continued routed. This allows to implement asynchronous {@link Producer} which can continue 025 * routing {@link Exchange} when all the data has been gathered. This allows to build non blocking 026 * request/reply communication. 027 * 028 * @version 029 */ 030public interface AsyncCallback { 031 032 /** 033 * This method is invoked once the {@link Exchange} is done. 034 * <p/> 035 * If an exception occurred while processing the exchange, the exception field of the 036 * {@link Exchange} being processed will hold the caused exception. 037 * 038 * @param doneSync is <tt>true</tt> if the processing of the {@link Exchange} was completed by a synchronous thread. 039 * Otherwise its <tt>false</tt> to indicate it was completed by an asynchronous thread. 040 */ 041 void done(boolean doneSync); 042 043}