spring AbstractAsyncReturnValueHandler 源码
spring AbstractAsyncReturnValueHandler 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/invocation/AbstractAsyncReturnValueHandler.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;
/**
* Convenient base class for {@link AsyncHandlerMethodReturnValueHandler}
* implementations that support only asynchronous (Future-like) return values
* and merely serve as adapters of such types to Spring's
* {@link org.springframework.util.concurrent.ListenableFuture ListenableFuture}.
*
* @author Sebastien Deleuze
* @since 4.2
*/
public abstract class AbstractAsyncReturnValueHandler implements AsyncHandlerMethodReturnValueHandler {
@Override
public boolean isAsyncReturnValue(Object returnValue, MethodParameter returnType) {
return true;
}
@Override
public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType, Message<?> message) {
// Should never be called since we return "true" from isAsyncReturnValue
throw new IllegalStateException("Unexpected invocation");
}
}
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