📍Use lombok, reformat, and optimize the code (#1560)

* Use lombok, reformat, and optimize the code

* Fix merge conflicts and some sonar issues

Co-authored-by: va1m <va1m@email.com>

event-driven-architecture/src/main/java/com/iluwatar/eda/event/UserCreatedEvent.java

@@ -24,21 +24,17 @@
 package com.iluwatar.eda.event;
 
 import com.iluwatar.eda.model.User;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * The {@link UserCreatedEvent} should should be dispatched whenever a user has been created. This
  * class can be extended to contain details about the user has been created. In this example, the
  * entire {@link User} object is passed on as data with the event.
  */
+@RequiredArgsConstructor
+@Getter
 public class UserCreatedEvent extends AbstractEvent {
 
   private final User user;
-
-  public UserCreatedEvent(User user) {
-    this.user = user;
-  }
-
-  public User getUser() {
-    return user;
-  }
 }

event-driven-architecture/src/main/java/com/iluwatar/eda/event/UserUpdatedEvent.java

@@ -24,21 +24,17 @@
 package com.iluwatar.eda.event;
 
 import com.iluwatar.eda.model.User;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * The {@link UserUpdatedEvent} should should be dispatched whenever a user has been updated. This
  * class can be extended to contain details about the user has been updated. In this example, the
  * entire {@link User} object is passed on as data with the event.
  */
+@RequiredArgsConstructor
+@Getter
 public class UserUpdatedEvent extends AbstractEvent {
 
   private final User user;
-
-  public UserUpdatedEvent(User user) {
-    this.user = user;
-  }
-
-  public User getUser() {
-    return user;
-  }
 }

event-driven-architecture/src/main/java/com/iluwatar/eda/handler/UserCreatedEventHandler.java

@@ -25,16 +25,14 @@ package com.iluwatar.eda.handler;
 
 import com.iluwatar.eda.event.UserCreatedEvent;
 import com.iluwatar.eda.framework.Handler;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Handles the {@link UserCreatedEvent} message.
  */
+@Slf4j
 public class UserCreatedEventHandler implements Handler<UserCreatedEvent> {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(UserCreatedEventHandler.class);
-
   @Override
   public void onEvent(UserCreatedEvent event) {
     LOGGER.info("User '{}' has been Created!", event.getUser().getUsername());

event-driven-architecture/src/main/java/com/iluwatar/eda/handler/UserUpdatedEventHandler.java

@@ -25,16 +25,14 @@ package com.iluwatar.eda.handler;
 
 import com.iluwatar.eda.event.UserUpdatedEvent;
 import com.iluwatar.eda.framework.Handler;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Handles the {@link UserUpdatedEvent} message.
  */
+@Slf4j
 public class UserUpdatedEventHandler implements Handler<UserUpdatedEvent> {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(UserUpdatedEventHandler.class);
-
   @Override
   public void onEvent(UserUpdatedEvent event) {
     LOGGER.info("User '{}' has been Updated!", event.getUser().getUsername());

event-driven-architecture/src/main/java/com/iluwatar/eda/model/User.java

@@ -25,20 +25,16 @@ package com.iluwatar.eda.model;
 
 import com.iluwatar.eda.event.UserCreatedEvent;
 import com.iluwatar.eda.event.UserUpdatedEvent;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * This {@link User} class is a basic pojo used to demonstrate user data sent along with the {@link
  * UserCreatedEvent} and {@link UserUpdatedEvent} events.
  */
+@RequiredArgsConstructor
+@Getter
 public class User {
 
   private final String username;
-
-  public User(String username) {
-    this.username = username;
-  }
-
-  public String getUsername() {
-    return username;
-  }
 }

event-driven-architecture/src/test/java/com/iluwatar/eda/event/UserCreatedEventTest.java

@@ -31,14 +31,14 @@ import org.junit.jupiter.api.Test;
 /**
  * {@link UserCreatedEventTest} tests and verifies {@link AbstractEvent} behaviour.
  */
-public class UserCreatedEventTest {
+class UserCreatedEventTest {
 
   /**
    * This unit test should correctly return the {@link AbstractEvent} class type when calling the
    * {@link AbstractEvent#getType() getType} method.
    */
   @Test
-  public void testGetEventType() {
+  void testGetEventType() {
     var user = new User("iluwatar");
     var userCreatedEvent = new UserCreatedEvent(user);
     assertEquals(UserCreatedEvent.class, userCreatedEvent.getType());

event-driven-architecture/src/test/java/com/iluwatar/eda/framework/EventDispatcherTest.java

@@ -36,14 +36,14 @@ import org.junit.jupiter.api.Test;
 /**
  * Event Dispatcher unit tests to assert and verify correct event dispatcher behaviour
  */
-public class EventDispatcherTest {
+class EventDispatcherTest {
 
   /**
    * This unit test should register events and event handlers correctly with the event dispatcher
    * and events should be dispatched accordingly.
    */
   @Test
-  public void testEventDriverPattern() {
+  void testEventDriverPattern() {
 
     var dispatcher = spy(new EventDispatcher());
     var userCreatedEventHandler = spy(new UserCreatedEventHandler());