Added AOT metadata.

We now register @BasePathAwareController instances for class proxy generation. Also, we scan the packages of repository definitions for projection interfaces to register reflective access for them.

Fixes #2183.

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/aot/BasePathAwareControllerAotProcessor.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 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.data.rest.webmvc.aot;
+
+import org.springframework.data.rest.webmvc.BasePathAwareController;
+import org.springframework.hateoas.aot.ControllerMethodReturnTypeAotProcessor;
+
+/**
+ * Extension of {@link ControllerMethodReturnTypeAotProcessor} to also pick up controllers defined using
+ * {@link BasePathAwareController}.
+ *
+ * @author Christoph Strobl
+ * @author Oliver Drotbohm
+ * @since 4.0
+ */
+class BasePathAwareControllerAotProcessor extends ControllerMethodReturnTypeAotProcessor {
+
+	protected BasePathAwareControllerAotProcessor() {
+		super(BasePathAwareController.class);
+	}
+}

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/aot/ProjectionProxyAotProcessor.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 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.data.rest.webmvc.aot;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.aop.SpringProxy;
+import org.springframework.beans.factory.aot.BeanRegistrationAotContribution;
+import org.springframework.beans.factory.aot.BeanRegistrationAotProcessor;
+import org.springframework.beans.factory.support.RegisteredBean;
+import org.springframework.core.DecoratingProxy;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.data.projection.TargetAware;
+import org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport;
+import org.springframework.data.rest.core.config.Projection;
+import org.springframework.data.util.AnnotatedTypeScanner;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ObjectUtils;
+
+/**
+ * {@link BeanRegistrationAotProcessor} to register proxy hints for projection interfaces.
+ *
+ * @author Oliver Drotbohm
+ * @since 4.0
+ */
+class ProjectionProxyAotProcessor implements BeanRegistrationAotProcessor {
+
+	private static final Logger LOGGER = LoggerFactory.getLogger(ProjectionProxyAotProcessor.class);
+
+	private static Class<?>[] ADDITIONAL_INTERFACES = new Class<?>[] { //
+			TargetAware.class, //
+			SpringProxy.class, //
+			DecoratingProxy.class
+	};
+
+	private Set<String> packagesSeen = new HashSet<>();
+
+	@Override
+	public BeanRegistrationAotContribution processAheadOfTime(RegisteredBean registeredBean) {
+
+		if (!ClassUtils.isAssignable(RepositoryFactoryBeanSupport.class, registeredBean.getBeanClass())) {
+			return null;
+		}
+
+		var holder = registeredBean.getMergedBeanDefinition() //
+				.getConstructorArgumentValues() //
+				.getIndexedArgumentValue(0, String.class);
+
+		var repositoryInterface = (String) holder.getValue();
+		var packageToScan = ClassUtils.getPackageName(repositoryInterface);
+
+		LOGGER.debug("Detecting projection interfaces in {}", packageToScan);
+
+		if (packagesSeen.contains(packageToScan)) {
+			return null;
+		}
+
+		packagesSeen.add(packageToScan);
+
+		return (context, code) -> {
+
+			var classLoader = registeredBean.getBeanFactory().getBeanClassLoader();
+			var proxies = context.getRuntimeHints().proxies();
+
+			var scanner = new AnnotatedTypeScanner(Projection.class);
+			scanner.setResourceLoader(new DefaultResourceLoader(classLoader));
+			scanner.findTypes(packageToScan)
+					.forEach(it -> {
+
+						LOGGER.debug("Registering proxy config for projection interface {}.", it.getName());
+
+						proxies.registerJdkProxy(ObjectUtils.addObjectToArray(ADDITIONAL_INTERFACES, it, 0));
+					});
+
+		};
+	}
+}

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/aot/package-info.java

@@ -0,0 +1,2 @@
+/** AOT & native configuration for rest.webmvc */
+package org.springframework.data.rest.webmvc.aot;

spring-data-rest-webmvc/src/main/resources/META-INF/spring/aot.factories

@@ -0,0 +1,3 @@
+org.springframework.beans.factory.aot.BeanRegistrationAotProcessor=\
+    org.springframework.data.rest.webmvc.aot.BasePathAwareControllerAotProcessor,\
+    org.springframework.data.rest.webmvc.aot.ProjectionProxyAotProcessor