spring ImmutableMessageChannelInterceptor 源码
spring ImmutableMessageChannelInterceptor 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/support/ImmutableMessageChannelInterceptor.java
/*
* Copyright 2002-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.messaging.support;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
/**
* A simpler interceptor that calls {@link MessageHeaderAccessor#setImmutable()}
* on the headers of messages passed through the preSend method.
*
* <p>When configured as the last interceptor in a chain, it allows the component
* sending the message to leave headers mutable for interceptors to modify prior
* to the message actually being sent and exposed to concurrent access.
*
* @author Rossen Stoyanchev
* @since 4.1.2
*/
public class ImmutableMessageChannelInterceptor implements ChannelInterceptor {
@Override
public Message<?> preSend(Message<?> message, MessageChannel channel) {
MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
if (accessor != null && accessor.isMutable()) {
accessor.setImmutable();
}
return message;
}
}
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