Register proxy hints for HttpExchange annotations

Close gh-29271

spring-web/src/main/java/org/springframework/web/service/annotation/HttpExchangeBeanRegistrationAotProcessor.java

@@ -0,0 +1,78 @@
+/*
+ * 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.web.service.annotation;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.aop.framework.AopProxyUtils;
+import org.springframework.aot.generate.GenerationContext;
+import org.springframework.aot.hint.ProxyHints;
+import org.springframework.beans.factory.aot.BeanRegistrationAotContribution;
+import org.springframework.beans.factory.aot.BeanRegistrationAotProcessor;
+import org.springframework.beans.factory.aot.BeanRegistrationCode;
+import org.springframework.beans.factory.support.RegisteredBean;
+import org.springframework.core.annotation.MergedAnnotations;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * AOT {@code BeanRegistrationAotProcessor} that detects the presence of
+ * {@link HttpExchange @HttpExchange} on methods and creates
+ * the required proxy hints.
+ *
+ * @author Sebastien Deleuze
+ * @since 6.0
+ */
+class HttpExchangeBeanRegistrationAotProcessor implements BeanRegistrationAotProcessor {
+
+	@Override
+	public BeanRegistrationAotContribution processAheadOfTime(RegisteredBean registeredBean) {
+		Class<?> beanClass = registeredBean.getBeanClass();
+		List<Class<?>> exchangeInterfaces = new ArrayList<>();
+		for (Class<?> interfaceClass : ClassUtils.getAllInterfacesForClass(beanClass)) {
+			ReflectionUtils.doWithMethods(interfaceClass, method -> {
+				if (!exchangeInterfaces.contains(interfaceClass) &&
+						MergedAnnotations.from(method, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
+								.get(HttpExchange.class).isPresent()) {
+					exchangeInterfaces.add(interfaceClass);
+				}
+			});
+		}
+		if (!exchangeInterfaces.isEmpty()) {
+			return new HttpExchangeBeanRegistrationAotContribution(exchangeInterfaces);
+		}
+		return null;
+	}
+
+	private static class HttpExchangeBeanRegistrationAotContribution implements BeanRegistrationAotContribution {
+
+		private final List<Class<?>> httpExchangeInterfaces;
+
+		public HttpExchangeBeanRegistrationAotContribution(List<Class<?>> httpExchangeInterfaces) {
+			this.httpExchangeInterfaces = httpExchangeInterfaces;
+		}
+
+		@Override
+		public void applyTo(GenerationContext generationContext, BeanRegistrationCode beanRegistrationCode) {
+			ProxyHints proxyHints = generationContext.getRuntimeHints().proxies();
+			for (Class<?> httpExchangeInterface : this.httpExchangeInterfaces) {
+				proxyHints.registerJdkProxy(AopProxyUtils.completeJdkProxyInterfaces(httpExchangeInterface));
+			}
+		}
+	}
+}