📍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>

queue-load-leveling/src/main/java/com/iluwatar/queue/load/leveling/App.java

@@ -26,8 +26,7 @@ package com.iluwatar.queue.load.leveling;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Many solutions in the cloud involve running tasks that invoke services. In this environment, if a
@@ -58,10 +57,9 @@ import org.slf4j.LoggerFactory;
  * MessageQueue. The service executor class {@link ServiceExecutor} will pick up one task at a time
  * from the Queue and execute them.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   //Executor shut down time limit.
   private static final int SHUTDOWN_TIME = 15;
 

queue-load-leveling/src/main/java/com/iluwatar/queue/load/leveling/Message.java

@@ -23,22 +23,17 @@
 
 package com.iluwatar.queue.load.leveling;
 
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
 /**
  * Message class with only one parameter.
  */
+@Getter
+@RequiredArgsConstructor
 public class Message {
   private final String msg;
 
-  // Parameter constructor.
-  public Message(String msg) {
-    this.msg = msg;
-  }
-
-  // Get Method for attribute msg.
-  public String getMsg() {
-    return msg;
-  }
-
   @Override
   public String toString() {
     return msg;

queue-load-leveling/src/main/java/com/iluwatar/queue/load/leveling/MessageQueue.java

@@ -25,17 +25,15 @@ package com.iluwatar.queue.load.leveling;
 
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * MessageQueue class. In this class we will create a Blocking Queue and submit/retrieve all the
  * messages from it.
  */
+@Slf4j
 public class MessageQueue {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   private final BlockingQueue<Message> blkQueue;
 
   // Default constructor when called creates Blocking Queue object. 

queue-load-leveling/src/main/java/com/iluwatar/queue/load/leveling/ServiceExecutor.java

@@ -23,17 +23,15 @@
 
 package com.iluwatar.queue.load.leveling;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * ServiceExecuotr class. This class will pick up Messages one by one from the Blocking Queue and
  * process them.
  */
+@Slf4j
 public class ServiceExecutor implements Runnable {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   private final MessageQueue msgQueue;
 
   public ServiceExecutor(MessageQueue msgQueue) {

queue-load-leveling/src/main/java/com/iluwatar/queue/load/leveling/TaskGenerator.java

@@ -23,18 +23,15 @@
 
 package com.iluwatar.queue.load.leveling;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * TaskGenerator class. Each TaskGenerator thread will be a Worker which submit's messages to the
  * queue. We need to mention the message count for each of the TaskGenerator threads.
  */
+@Slf4j
 public class TaskGenerator implements Task, Runnable {
 
-
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   // MessageQueue reference using which we will submit our messages.
   private final MessageQueue msgQueue;
 

queue-load-leveling/src/test/java/com/iluwatar/queue/load/leveling/MessageQueueTest.java

@@ -30,10 +30,10 @@ import org.junit.jupiter.api.Test;
 /**
  * Test case for submitting and retrieving messages from Blocking Queue.
  */
-public class MessageQueueTest {
+class MessageQueueTest {
 
   @Test
-  public void messageQueueTest() {
+  void messageQueueTest() {
 
     var msgQueue = new MessageQueue();
 

queue-load-leveling/src/test/java/com/iluwatar/queue/load/leveling/MessageTest.java

@@ -30,10 +30,10 @@ import org.junit.jupiter.api.Test;
 /**
  * Test case for creating and checking the Message.
  */
-public class MessageTest {
+class MessageTest {
 
   @Test
-  public void messageTest() {
+  void messageTest() {
 
     // Parameterized constructor test.
     var testMsg = "Message Test";