Bean life cycle

pom.xml

@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.0.M1</version>
+		<version>2.1.0.RELEASE</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 

src/main/java/guru/springframework/CustomBeanPostProcessor.java

@@ -0,0 +1,30 @@
+package guru.springframework;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.stereotype.Component;
+
+/**
+ * Created by jt on 6/5/17.
+ */
+@Component
+public class CustomBeanPostProcessor implements BeanPostProcessor {
+    @Override
+    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
+
+        if(bean instanceof LifeCycleDemoBean){
+            ((LifeCycleDemoBean) bean).beforeInit();
+        }
+
+        return bean;
+    }
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+        if(bean instanceof LifeCycleDemoBean){
+            ((LifeCycleDemoBean) bean).afterInit();
+        }
+
+        return bean;
+    }
+}

src/main/java/guru/springframework/DiDemoApplication.java

@@ -1,12 +1,24 @@
 package guru.springframework;
 
+import guru.springframework.controllers.ConstructorInjectedController;
+import guru.springframework.controllers.GetterInjectedController;
+import guru.springframework.controllers.MyController;
+import guru.springframework.controllers.PropertyInjectedController;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
 
 @SpringBootApplication
 public class DiDemoApplication {
 
 	public static void main(String[] args) {
-		SpringApplication.run(DiDemoApplication.class, args);
+		ApplicationContext ctx = SpringApplication.run(DiDemoApplication.class, args);
+
+		MyController controller = (MyController) ctx.getBean("myController");
+
+		System.out.println(controller.hello());
+		System.out.println(ctx.getBean(PropertyInjectedController.class).sayHello());
+		System.out.println(ctx.getBean(GetterInjectedController.class).sayHello());
+		System.out.println(ctx.getBean(ConstructorInjectedController.class).sayHello());
 	}
 }

src/main/java/guru/springframework/LifeCycleDemoBean.java

@@ -0,0 +1,69 @@
+package guru.springframework;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.*;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+
+/**
+ * Created by jt on 6/5/17.
+ */
+@Component
+public class LifeCycleDemoBean implements InitializingBean, DisposableBean, BeanNameAware,
+        BeanFactoryAware, ApplicationContextAware{
+
+
+    public LifeCycleDemoBean() {
+        System.out.println("## I'm in the LifeCycleBean Constructor");
+    }
+
+    @Override
+    public void destroy() throws Exception {
+        System.out.println("## The Lifecycle bean has been terminated");
+
+    }
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        System.out.println("## The LifeCycleBean has its properties set!");
+
+    }
+
+    @Override
+    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+        System.out.println("## Bean Factory has been set");
+    }
+
+    @Override
+    public void setBeanName(String name) {
+        System.out.println("## My Bean Name is: " + name);
+
+    }
+
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+        System.out.println("## Application context has been set");
+    }
+
+    @PostConstruct
+    public void postConstruct(){
+        System.out.println("## The Post Construct annotated method has been called");
+    }
+
+    @PreDestroy
+    public void preDestroy() {
+        System.out.println("## The Predestroy annotated method has been called");
+    }
+
+    public void beforeInit(){
+        System.out.println("## - Before Init - Called by Bean Post Processor");
+    }
+
+    public void afterInit(){
+        System.out.println("## - After init called by Bean Post Processor");
+    }
+}

src/main/java/guru/springframework/controllers/ConstructorInjectedController.java

@@ -0,0 +1,22 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Controller;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Controller
+public class ConstructorInjectedController {
+
+    private GreetingService greetingService;
+
+    public ConstructorInjectedController(@Qualifier("constructorGreetingService") GreetingService greetingService) {
+        this.greetingService = greetingService;
+    }
+
+    public String sayHello(){
+        return greetingService.sayGreeting();
+    }
+}

src/main/java/guru/springframework/controllers/GetterInjectedController.java

@@ -0,0 +1,23 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Controller;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Controller
+public class GetterInjectedController {
+    private GreetingService greetingService;
+
+    public String sayHello(){
+        return greetingService.sayGreeting();
+    }
+
+    @Autowired
+    public void setGreetingService(@Qualifier("getterGreetingService") GreetingService greetingService) {
+        this.greetingService = greetingService;
+    }
+}

src/main/java/guru/springframework/controllers/MyController.java

@@ -0,0 +1,23 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.stereotype.Controller;
+
+/**
+ * Created by jt on 5/23/17.
+ */
+@Controller
+public class MyController {
+
+    private GreetingService greetingService;
+
+    public MyController(GreetingService greetingService) {
+        this.greetingService = greetingService;
+    }
+
+    public String hello(){
+        System.out.println("Hello!!! ");
+
+        return greetingService.sayGreeting();
+    }
+}

src/main/java/guru/springframework/controllers/PropertyInjectedController.java

@@ -0,0 +1,23 @@
+package guru.springframework.controllers;
+
+import guru.springframework.services.GreetingService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Controller;
+
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Controller
+public class PropertyInjectedController {
+
+    @Autowired
+    @Qualifier("greetingServiceImpl")
+    public GreetingService greetingServiceImpl;
+
+    public String sayHello(){
+        return greetingServiceImpl.sayGreeting();
+    }
+
+}

src/main/java/guru/springframework/services/ConstructorGreetingService.java

@@ -0,0 +1,14 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+public class ConstructorGreetingService implements GreetingService {
+    @Override
+    public String sayGreeting() {
+        return "Hello - I was injected via the constructor!!!";
+    }
+}

src/main/java/guru/springframework/services/GetterGreetingService.java

@@ -0,0 +1,15 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+public class GetterGreetingService implements GreetingService {
+
+    @Override
+    public String sayGreeting() {
+        return "Hello - I was injected by the getter";
+    }
+}

src/main/java/guru/springframework/services/GreetingRepository.java

@@ -0,0 +1,13 @@
+package guru.springframework.services;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+public interface GreetingRepository {
+
+    String getEnglishGreeting();
+
+    String getSpanishGreeting();
+
+    String getGermanGreeting();
+}

src/main/java/guru/springframework/services/GreetingRepositoryImpl.java

@@ -0,0 +1,27 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Component;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Component
+public class GreetingRepositoryImpl implements GreetingRepository {
+
+    @Override
+    public String getEnglishGreeting() {
+        return "Hello - Primary Greeting service";
+    }
+
+    @Override
+    public String getSpanishGreeting() {
+        return "Servicio de Saludo Primario";
+    }
+
+    @Override
+    public String getGermanGreeting() {
+
+        return "Primärer Grußdienst";
+
+    }
+}

src/main/java/guru/springframework/services/GreetingService.java

@@ -0,0 +1,9 @@
+package guru.springframework.services;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+public interface GreetingService {
+
+    String sayGreeting();
+}

src/main/java/guru/springframework/services/GreetingServiceImpl.java

@@ -0,0 +1,17 @@
+package guru.springframework.services;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+public class GreetingServiceImpl implements GreetingService {
+
+    public static final String HELLO_GURUS = "Hello Gurus!!!! - Original";
+
+    @Override
+    public String sayGreeting() {
+        return HELLO_GURUS;
+    }
+}

src/main/java/guru/springframework/services/PrimaryGermanGreetingService.java

@@ -0,0 +1,25 @@
+package guru.springframework.services;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+@Primary
+@Profile("de")
+public class PrimaryGermanGreetingService implements GreetingService {
+
+    private GreetingRepository greetingRepository;
+
+    public PrimaryGermanGreetingService(GreetingRepository greetingRepository) {
+        this.greetingRepository = greetingRepository;
+    }
+
+    @Override
+    public String sayGreeting() {
+        return greetingRepository.getGermanGreeting();
+    }
+}

src/main/java/guru/springframework/services/PrimaryGreetingService.java

@@ -0,0 +1,25 @@
+package guru.springframework.services;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by jt on 5/24/17.
+ */
+@Service
+@Primary
+@Profile({"en", "default"})
+public class PrimaryGreetingService implements GreetingService {
+
+    private GreetingRepository greetingRepository;
+
+    public PrimaryGreetingService(GreetingRepository greetingRepository) {
+        this.greetingRepository = greetingRepository;
+    }
+
+    @Override
+    public String sayGreeting() {
+        return greetingRepository.getEnglishGreeting();
+    }
+}