spring HandlerMethodReturnValueHandler 源码
spring HandlerMethodReturnValueHandler 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/invocation/HandlerMethodReturnValueHandler.java
/*
* Copyright 2002-2017 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.handler.invocation;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
/**
* Strategy interface to handle the value returned from the invocation of a
* method handling a {@link Message}.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public interface HandlerMethodReturnValueHandler {
/**
* Whether the given {@linkplain MethodParameter method return type} is
* supported by this handler.
* @param returnType the method return type to check
* @return {@code true} if this handler supports the supplied return type;
* {@code false} otherwise
*/
boolean supportsReturnType(MethodParameter returnType);
/**
* Handle the given return value.
* @param returnValue the value returned from the handler method
* @param returnType the type of the return value. This type must have previously
* been passed to {@link #supportsReturnType(org.springframework.core.MethodParameter)}
* and it must have returned {@code true}.
* @param message the message that caused this method to be called
* @throws Exception if the return value handling results in an error
*/
void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType, Message<?> message)
throws Exception;
}
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