GH-157 - Improve aggregate lookup.

We now directly collect all aggregate types instead of looking up entities first.

spring-modulith-core/src/main/java/org/springframework/modulith/core/ApplicationModule.java

@@ -72,7 +72,7 @@ public class ApplicationModule {
 	private final boolean useFullyQualifiedModuleNames;
 
 	private final Supplier<Classes> springBeans;
-	private final Supplier<Classes> entities;
+	private final Supplier<Classes> aggregateRoots;
 	private final Supplier<List<JavaClass>> valueTypes;
 	private final Supplier<List<EventType>> publishedEvents;
 
@@ -90,7 +90,7 @@ public class ApplicationModule {
 		this.useFullyQualifiedModuleNames = useFullyQualifiedModuleNames;
 
 		this.springBeans = Suppliers.memoize(() -> filterSpringBeans(basePackage));
-		this.entities = Suppliers.memoize(() -> findEntities(basePackage));
+		this.aggregateRoots = Suppliers.memoize(() -> findAggregateRoots(basePackage));
 		this.valueTypes = Suppliers
 				.memoize(() -> findArchitecturallyEvidentType(ArchitecturallyEvidentType::isValueObject));
 		this.publishedEvents = Suppliers.memoize(() -> findPublishedEvents());
@@ -195,10 +195,7 @@ public class ApplicationModule {
 	 */
 	public List<JavaClass> getAggregateRoots() {
 
-		return entities.get().stream() //
-				.map(it -> ArchitecturallyEvidentType.of(it, getSpringBeansInternal())) //
-				.filter(ArchitecturallyEvidentType::isAggregateRoot) //
-				.map(ArchitecturallyEvidentType::getType) //
+		return aggregateRoots.get().stream() //
 				.flatMap(this::resolveModuleSuperTypes) //
 				.distinct() //
 				.toList();
@@ -433,7 +430,7 @@ public class ApplicationModule {
 		}
 
 		return Objects.equals(this.basePackage, that.basePackage) //
-				&& Objects.equals(this.entities, that.entities) //
+				&& Objects.equals(this.aggregateRoots, that.aggregateRoots) //
 				&& Objects.equals(this.information, that.information) //
 				&& Objects.equals(this.namedInterfaces, that.namedInterfaces) //
 				&& Objects.equals(this.publishedEvents, that.publishedEvents) //
@@ -448,7 +445,7 @@ public class ApplicationModule {
 	 */
 	@Override
 	public int hashCode() {
-		return Objects.hash(basePackage, entities, information, namedInterfaces, publishedEvents, springBeans,
+		return Objects.hash(basePackage, aggregateRoots, information, namedInterfaces, publishedEvents, springBeans,
 				useFullyQualifiedModuleNames, valueTypes);
 	}
 
@@ -532,12 +529,13 @@ public class ApplicationModule {
 		return modules.contains(dependency) && !contains(dependency);
 	}
 
-	private Classes findEntities(JavaPackage source) {
+	private Classes findAggregateRoots(JavaPackage source) {
 
 		return source.stream() //
 				.map(it -> ArchitecturallyEvidentType.of(it, getSpringBeansInternal()))
-				.filter(ArchitecturallyEvidentType::isEntity) //
-				.map(ArchitecturallyEvidentType::getType).collect(Classes.toClasses());
+				.filter(ArchitecturallyEvidentType::isAggregateRoot) //
+				.map(ArchitecturallyEvidentType::getType) //
+				.collect(Classes.toClasses());
 	}
 
 	private static Classes filterSpringBeans(JavaPackage source) {

spring-modulith-core/src/test/java/com/acme/withatbean/SampleAggregate.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2023 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 com.acme.withatbean;
+
+import org.jmolecules.ddd.types.AggregateRoot;
+import org.jmolecules.ddd.types.Identifier;
+
+import com.acme.withatbean.SampleAggregate.SampleIdentifier;
+
+/**
+ * @author Oliver Drotbohm
+ */
+public class SampleAggregate implements AggregateRoot<SampleAggregate, SampleIdentifier> {
+
+	@Override
+	public SampleIdentifier getId() {
+		return null;
+	}
+
+	record SampleIdentifier() implements Identifier {}
+}

spring-modulith-core/src/test/java/org/springframework/modulith/core/ModuleUnitTest.java

@@ -25,6 +25,7 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.api.TestInstance.Lifecycle;
 
+import com.acme.withatbean.SampleAggregate;
 import com.acme.withatbean.TestEvents.JMoleculesAnnotated;
 import com.acme.withatbean.TestEvents.JMoleculesImplementing;
 import com.tngtech.archunit.core.domain.JavaClass;
@@ -74,4 +75,12 @@ class ModuleUnitTest {
 	void usesCapitalizedNameAsDisplayNameByDefault() {
 		assertThat(module.getDisplayName()).isEqualTo("Withatbean");
 	}
+
+	@Test // GH-157
+	void detectsAggregates() {
+
+		assertThat(module.getAggregateRoots())
+				.<Class<?>> extracting(JavaClass::reflect)
+				.containsExactly(SampleAggregate.class);
+	}
 }