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 * Callback for sending a exchange message to a endpoint using a producer. 021 * <p/> 022 * Using this callback as a template pattern ensures that Camel handles the resource handling and will 023 * start and stop the given producer, to avoid resource leaks. 024 * 025 * @version 026 */ 027public interface ProducerCallback<T> { 028 029 /** 030 * Performs operation on the given producer to send the given exchange. 031 * 032 * @param producer the producer, is never <tt>null</tt> 033 * @param exchange the exchange, can be <tt>null</tt> if so then create a new exchange from the producer 034 * @param exchangePattern the exchange pattern, can be <tt>null</tt> 035 * @return the response 036 * @throws Exception if an internal processing error has occurred. 037 */ 038 T doInProducer(Producer producer, Exchange exchange, ExchangePattern exchangePattern) throws Exception; 039}