Adding ServerBuilder

src/builder/ServerBuilder.java

+package builder;
+
+import server.Server;
+
+import java.io.IOException;
+
+public class ServerBuilder {
+    private int port;
+    private String role;
+
+    public void port(int port) {
+        this.port = port;
+    }
+
+    public void role(String role) {
+        this.role = role;
+    }
+
+    public Server build() {
+        try {
+            return Server.getInstance(port, role);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to build the Server");
+        }
+    }
+}

src/server/Server.java

@@ -10,18 +10,21 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 public class Server {
-    private static final int PORT = 16379;
+    private  final int PORT ;
     private final ExecutorService executor;
+    private final String role;
 
     private static Server instance;
 
-    private Server() {
+    Server(int port, String role) {
+        PORT = port;
+        this.role = role;
         this.executor = Executors.newVirtualThreadPerTaskExecutor();
     }
 
-    public static synchronized Server getInstance() throws IOException {
+    public static synchronized Server getInstance(int PORT,String role) throws IOException {
         if (instance == null) {
-            instance = new Server();
+            instance = new Server(PORT,role);
         }
         return instance;
     }