BAEL-4068 Add AspectJ DI to module spring-di-2

spring-di-2/pom.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-di-2</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>spring-di-2</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-spring-5</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-spring-5</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+            <version>${spring-boot.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-aspects</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>aspectj-maven-plugin</artifactId>
+                <version>${aspectj-plugin.version}</version>
+                <configuration>
+                    <complianceLevel>${java.version}</complianceLevel>
+                    <aspectLibraries>
+                        <aspectLibrary>
+                            <groupId>org.springframework</groupId>
+                            <artifactId>spring-aspects</artifactId>
+                        </aspectLibrary>
+                    </aspectLibraries>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <spring-boot.version>2.3.1.RELEASE</spring-boot.version>
+        <aspectj-plugin.version>1.11</aspectj-plugin.version>
+    </properties>
+</project>

spring-di-2/src/main/java/com/baeldung/di/aspectj/AspectJConfig.java

@@ -0,0 +1,9 @@
+package com.baeldung.di.aspectj;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.aspectj.EnableSpringConfigured;
+
+@ComponentScan
+@EnableSpringConfigured
+public class AspectJConfig {
+}

spring-di-2/src/main/java/com/baeldung/di/aspectj/IdService.java

@@ -0,0 +1,12 @@
+package com.baeldung.di.aspectj;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class IdService {
+    private static int count;
+
+    int generateId() {
+        return ++count;
+    }
+}

spring-di-2/src/main/java/com/baeldung/di/aspectj/PersonEntity.java

@@ -0,0 +1,36 @@
+package com.baeldung.di.aspectj;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Configurable;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Transient;
+
+@Entity
+@Configurable(preConstruction = true)
+public class PersonEntity {
+    @Autowired
+    @Transient
+    private IdService idService;
+
+    @Id
+    private int id;
+    private String name;
+
+    public PersonEntity() {
+    }
+
+    public PersonEntity(String name) {
+        id = idService.generateId();
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

spring-di-2/src/main/java/com/baeldung/di/aspectj/PersonObject.java

@@ -0,0 +1,29 @@
+package com.baeldung.di.aspectj;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Configurable;
+
+@Configurable
+public class PersonObject {
+    @Autowired
+    private IdService idService;
+
+    private int id;
+    private String name;
+
+    public PersonObject(String name) {
+        this.name = name;
+    }
+
+    void generateId() {
+        this.id = idService.generateId();
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

spring-di-2/src/test/java/com/baeldung/di/aspectj/PersonUnitTest.java

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+package com.baeldung.di.aspectj;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = AspectJConfig.class)
+public class PersonUnitTest {
+    @Test
+    public void givenUnmanagedObjects_whenInjectingIdService_thenIdValueIsCorrectlySet() {
+        PersonObject personObject = new PersonObject("Baeldung");
+        personObject.generateId();
+        assertEquals(1, personObject.getId());
+        assertEquals("Baeldung", personObject.getName());
+
+        PersonEntity personEntity = new PersonEntity("Baeldung");
+        assertEquals(2, personEntity.getId());
+        assertEquals("Baeldung", personEntity.getName());
+    }
+}