Adding Director

src/Main.java

+import builder.Director;
+import builder.ServerBuilder;
 import server.Server;
 
-import java.io.IOException;
-
 public class Main {
 
     public static void main(String[] args) {
-        try {
-            Server.getInstance().start();
-        } catch (IOException e) {
-            System.err.println("Server failed to start: " + e.getMessage());
-        }
+        Director director = new Director();
+        ServerBuilder builder = new ServerBuilder();
+        director.buildMaster(builder);
+        builder.port(16379);
+        Server server = builder.build();
+        server.start();
     }
 }
\ No newline at end of file

src/builder/Director.java

+package builder;
+
+public class Director {
+    public void buildMaster(ServerBuilder builder) {
+        builder.role("Master");
+    }
+
+    public void buildReplica(ServerBuilder builder) {
+        builder.role("Replica");
+    }
+}