spring SyncHandlerMethodArgumentResolver 源码
spring SyncHandlerMethodArgumentResolver 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/SyncHandlerMethodArgumentResolver.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.web.reactive.result.method;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.server.ServerWebExchange;
/**
* An extension of {@link HandlerMethodArgumentResolver} for implementations
* that are synchronous in nature and do not block to resolve values.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public interface SyncHandlerMethodArgumentResolver extends HandlerMethodArgumentResolver {
/**
* {@inheritDoc}
* <p>By default this simply delegates to {@link #resolveArgumentValue} for
* synchronous resolution.
*/
@Override
default Mono<Object> resolveArgument(
MethodParameter parameter, BindingContext bindingContext, ServerWebExchange exchange) {
return Mono.justOrEmpty(resolveArgumentValue(parameter, bindingContext, exchange));
}
/**
* Resolve the value for the method parameter synchronously.
* @param parameter the method parameter
* @param bindingContext the binding context to use
* @param exchange the current exchange
* @return the resolved value, if any
*/
@Nullable
Object resolveArgumentValue(
MethodParameter parameter, BindingContext bindingContext, ServerWebExchange exchange);
}
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