📍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>

leader-election/src/main/java/com/iluwatar/leaderelection/AbstractInstance.java

@@ -25,16 +25,14 @@ package com.iluwatar.leaderelection;
 
 import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Abstract class of all the instance implementation classes.
  */
+@Slf4j
 public abstract class AbstractInstance implements Instance, Runnable {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(AbstractInstance.class);
-
   protected static final int HEARTBEAT_INTERVAL = 5000;
   private static final String INSTANCE = "Instance ";
 

leader-election/src/main/java/com/iluwatar/leaderelection/Message.java

@@ -23,55 +23,23 @@
 
 package com.iluwatar.leaderelection;
 
-import java.util.Objects;
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
 
 /**
  * Message used to transport data between instances.
  */
+@Setter
+@Getter
+@EqualsAndHashCode
+@AllArgsConstructor
+@NoArgsConstructor
 public class Message {
 
   private MessageType type;
-
   private String content;
 
-  public Message() {
-  }
-
-  public Message(MessageType type, String content) {
-    this.type = type;
-    this.content = content;
-  }
-
-  public MessageType getType() {
-    return type;
-  }
-
-  public void setType(MessageType type) {
-    this.type = type;
-  }
-
-  public String getContent() {
-    return content;
-  }
-
-  public void setContent(String content) {
-    this.content = content;
-  }
-
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
-    if (o == null || getClass() != o.getClass()) {
-      return false;
-    }
-    var message = (Message) o;
-    return type == message.type && Objects.equals(content, message.content);
-  }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(type, content);
-  }
 }

leader-election/src/main/java/com/iluwatar/leaderelection/bully/BullyInstance.java

@@ -26,8 +26,7 @@ package com.iluwatar.leaderelection.bully;
 import com.iluwatar.leaderelection.AbstractInstance;
 import com.iluwatar.leaderelection.Message;
 import com.iluwatar.leaderelection.MessageManager;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Impelemetation with bully algorithm. Each instance should have a sequential id and is able to
@@ -38,9 +37,8 @@ import org.slf4j.LoggerFactory;
  * it will return an alive message (in this sample return true) and then send election message with
  * its ID. If not, the original instance will send leader message to all the other instances.
  */
+@Slf4j
 public class BullyInstance extends AbstractInstance {
-
-  private static final Logger LOGGER = LoggerFactory.getLogger(BullyInstance.class);
   private static final String INSTANCE = "Instance ";
 
   /**

leader-election/src/main/java/com/iluwatar/leaderelection/ring/RingInstance.java

@@ -27,10 +27,8 @@ import com.iluwatar.leaderelection.AbstractInstance;
 import com.iluwatar.leaderelection.Message;
 import com.iluwatar.leaderelection.MessageManager;
 import java.util.Arrays;
-import java.util.List;
 import java.util.stream.Collectors;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Implementation with token ring algorithm. The instances in the system are organized as a ring.
@@ -43,9 +41,8 @@ import org.slf4j.LoggerFactory;
  * smallest ID to be the new leader, and then send a leader message to other instances to inform the
  * result.
  */
+@Slf4j
 public class RingInstance extends AbstractInstance {
-
-  private static final Logger LOGGER = LoggerFactory.getLogger(RingInstance.class);
   private static final String INSTANCE = "Instance ";
 
   /**