GH-1064 - Move AOT processor to generate application module metadata into runtime module.

spring-modulith-runtime/src/main/java/org/springframework/modulith/runtime/autoconfigure/ApplicationModulesFileGeneratingProcessor.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023-2025 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.modulith.runtime.autoconfigure;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.aot.BeanFactoryInitializationAotContribution;
+import org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.modulith.core.util.ApplicationModulesExporter;
+import org.springframework.modulith.runtime.ApplicationModulesRuntime;
+
+/**
+ * Renders the application module description JSON into a resource named
+ * {@value ApplicationModulesEndpointConfiguration#FILE_LOCATION}.
+ *
+ * @author Oliver Drotbohm
+ * @since 1.4
+ */
+class ApplicationModulesFileGeneratingProcessor implements BeanFactoryInitializationAotProcessor {
+
+	private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationModulesFileGeneratingProcessor.class);
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor#processAheadOfTime(org.springframework.beans.factory.config.ConfigurableListableBeanFactory)
+	 */
+	@Override
+	public BeanFactoryInitializationAotContribution processAheadOfTime(ConfigurableListableBeanFactory beanFactory) {
+
+		return (context, __) -> {
+
+			var runtime = beanFactory.getBean(ApplicationModulesRuntime.class);
+			var exporter = new ApplicationModulesExporter(runtime.get());
+			var location = ApplicationModulesExporter.DEFAULT_LOCATION;
+
+			LOGGER.info("Generating application modules information to {}", location);
+
+			context.getRuntimeHints().resources().registerPattern(location);
+			context.getGeneratedFiles().addResourceFile(location, exporter.toJson());
+		};
+	}
+}

spring-modulith-runtime/src/main/resources/META-INF/spring/aot.factories

@@ -0,0 +1,2 @@
+org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor=\
+    org.springframework.modulith.runtime.autoconfigure.ApplicationModulesFileGeneratingProcessor