Java 11 migrate c-d (remaining) (#1111)

* Moves converter pattern to Java 11

* Moves cqrs pattern to Java 11

* Moves dao pattern to Java 11

* Moves data-bus pattern to Java 11

* Moves data-locality pattern to Java 11

* Moves data-mapper pattern to Java 11

* Moves data-transfer-object pattern to Java 11

* Moves decorator pattern to Java 11

* Moves delegation pattern to Java 11

* Moves dependency-injection to Java 11

* Moves dirty-flag to Java 11

* Moves double-buffer to Java 11

* Moves double-checked-locking to Java 11

* Moves double-dispatch to Java 11

* Corrects with changes thats breaking test cases

data-bus/src/main/java/com/iluwatar/databus/App.java

@@ -59,11 +59,11 @@ import java.time.LocalDateTime;
 class App {
 
   public static void main(String[] args) {
-    final DataBus bus = DataBus.getInstance();
+    final var bus = DataBus.getInstance();
     bus.subscribe(new StatusMember(1));
     bus.subscribe(new StatusMember(2));
-    final MessageCollectorMember foo = new MessageCollectorMember("Foo");
-    final MessageCollectorMember bar = new MessageCollectorMember("Bar");
+    final var foo = new MessageCollectorMember("Foo");
+    final var bar = new MessageCollectorMember("Bar");
     bus.subscribe(foo);
     bus.publish(StartingData.of(LocalDateTime.now()));
     bus.publish(MessageData.of("Only Foo should see this"));

data-bus/src/main/java/com/iluwatar/databus/members/MessageCollectorMember.java

@@ -27,7 +27,6 @@ import com.iluwatar.databus.DataType;
 import com.iluwatar.databus.Member;
 import com.iluwatar.databus.data.MessageData;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.logging.Logger;
 
@@ -61,6 +60,6 @@ public class MessageCollectorMember implements Member {
   }
 
   public List<String> getMessages() {
-    return Collections.unmodifiableList(messages);
+    return List.copyOf(messages);
   }
 }