org.springframework.web.reactive.function.server.support.HandlerFunctionAdapter Maven / Gradle / Ivy
/*
* 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
*
* http://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.function.server.support;
import java.lang.reflect.Method;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.web.reactive.HandlerAdapter;
import org.springframework.web.reactive.HandlerResult;
import org.springframework.web.reactive.function.server.HandlerFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.server.ServerWebExchange;
/**
* {@code HandlerAdapter} implementation that supports {@link HandlerFunction HandlerFunctions}.
*
* @author Arjen Poutsma
* @since 5.0
*/
public class HandlerFunctionAdapter implements HandlerAdapter {
private static final MethodParameter HANDLER_FUNCTION_RETURN_TYPE;
static {
try {
Method method = HandlerFunction.class.getMethod("handle", ServerRequest.class);
HANDLER_FUNCTION_RETURN_TYPE = new MethodParameter(method, -1);
}
catch (NoSuchMethodException ex) {
throw new IllegalStateException(ex);
}
}
@Override
public boolean supports(Object handler) {
return handler instanceof HandlerFunction;
}
@Override
public Mono handle(ServerWebExchange exchange, Object handler) {
HandlerFunction handlerFunction = (HandlerFunction) handler;
ServerRequest request = exchange.getRequiredAttribute(RouterFunctions.REQUEST_ATTRIBUTE);
return handlerFunction.handle(request)
.map(response -> new HandlerResult(handlerFunction, response, HANDLER_FUNCTION_RETURN_TYPE));
}
}