001/* 002 * Copyright 2002-2014 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.messaging.support; 018 019import org.springframework.messaging.Message; 020import org.springframework.messaging.MessageChannel; 021 022/** 023 * A simpler interceptor that calls {@link MessageHeaderAccessor#setImmutable()} 024 * on the headers of messages passed through the preSend method. 025 * 026 * <p>When configured as the last interceptor in a chain, it allows the component 027 * sending the message to leave headers mutable for interceptors to modify prior 028 * to the message actually being sent and exposed to concurrent access. 029 * 030 * @author Rossen Stoyanchev 031 * @since 4.1.2 032 */ 033public class ImmutableMessageChannelInterceptor extends ChannelInterceptorAdapter { 034 035 @Override 036 public Message<?> preSend(Message<?> message, MessageChannel channel) { 037 MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class); 038 if (accessor != null && accessor.isMutable()) { 039 accessor.setImmutable(); 040 } 041 return message; 042 } 043 044}