spring RSocketRequesterMethodArgumentResolver 源码
spring RSocketRequesterMethodArgumentResolver 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/RSocketRequesterMethodArgumentResolver.java
/*
* Copyright 2002-2020 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.rsocket.annotation.support;
import io.rsocket.RSocket;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.messaging.Message;
import org.springframework.messaging.handler.invocation.reactive.HandlerMethodArgumentResolver;
import org.springframework.messaging.rsocket.RSocketRequester;
import org.springframework.util.Assert;
/**
* Resolves arguments of type {@link RSocket} that can be used for making
* requests to the remote peer.
*
* @author Rossen Stoyanchev
* @since 5.2
*/
public class RSocketRequesterMethodArgumentResolver implements HandlerMethodArgumentResolver {
/**
* Message header name that is expected to have the {@link RSocket} to
* initiate new interactions to the remote peer with.
*/
public static final String RSOCKET_REQUESTER_HEADER = "rsocketRequester";
@Override
public boolean supportsParameter(MethodParameter parameter) {
Class<?> type = parameter.getParameterType();
return (RSocketRequester.class.equals(type) || RSocket.class.isAssignableFrom(type));
}
@Override
public Mono<Object> resolveArgument(MethodParameter parameter, Message<?> message) {
Object headerValue = message.getHeaders().get(RSOCKET_REQUESTER_HEADER);
Assert.notNull(headerValue, "Missing '" + RSOCKET_REQUESTER_HEADER + "'");
Assert.isInstanceOf(RSocketRequester.class, headerValue, "Expected header value of type RSocketRequester");
RSocketRequester requester = (RSocketRequester) headerValue;
Class<?> type = parameter.getParameterType();
if (RSocketRequester.class.equals(type)) {
return Mono.just(requester);
}
else if (RSocket.class.isAssignableFrom(type)) {
return Mono.justOrEmpty(requester.rsocket());
}
else {
return Mono.error(new IllegalArgumentException("Unexpected parameter type: " + parameter));
}
}
}
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