spring ReactiveReturnValueHandler 源码
spring ReactiveReturnValueHandler 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/invocation/ReactiveReturnValueHandler.java
/*
* Copyright 2002-2022 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 java.util.concurrent.CompletableFuture;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapter;
import org.springframework.core.ReactiveAdapterRegistry;
/**
* Support for single-value reactive types (like {@code Mono} or {@code Single})
* as a return value type.
*
* @author Sebastien Deleuze
* @since 5.1
*/
public class ReactiveReturnValueHandler extends AbstractAsyncReturnValueHandler {
private final ReactiveAdapterRegistry adapterRegistry;
public ReactiveReturnValueHandler() {
this(ReactiveAdapterRegistry.getSharedInstance());
}
public ReactiveReturnValueHandler(ReactiveAdapterRegistry adapterRegistry) {
this.adapterRegistry = adapterRegistry;
}
@Override
public boolean supportsReturnType(MethodParameter returnType) {
return (this.adapterRegistry.getAdapter(returnType.getParameterType()) != null);
}
@Override
public boolean isAsyncReturnValue(Object returnValue, MethodParameter returnType) {
ReactiveAdapter adapter = this.adapterRegistry.getAdapter(returnType.getParameterType(), returnValue);
return (adapter != null && !adapter.isMultiValue() && !adapter.isNoValue());
}
@Override
public CompletableFuture<?> toCompletableFuture(Object returnValue, MethodParameter returnType) {
ReactiveAdapter adapter = this.adapterRegistry.getAdapter(returnType.getParameterType(), returnValue);
if (adapter != null) {
return Mono.from(adapter.toPublisher(returnValue)).toFuture();
}
return null;
}
}
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