Implement locks to hopefully resolve race conditions with I/O - experimental

common/src/main/java/me/lucko/luckperms/tracks/Track.java

@@ -34,6 +34,8 @@ import me.lucko.luckperms.utils.Identifiable;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
 
 @ToString
 @EqualsAndHashCode(of = {"name"})
@@ -51,6 +53,9 @@ public class Track implements Identifiable<String> {
      */
     private List<String> groups = Collections.synchronizedList(new ArrayList<>());
 
+    @Getter
+    private final Lock ioLock = new ReentrantLock();
+
     @Override
     public String getId() {
         return name;

common/src/main/java/me/lucko/luckperms/tracks/TrackManager.java

@@ -40,18 +40,13 @@ public class TrackManager extends AbstractManager<String, Track> {
                 .collect(Collectors.toSet());
     }
 
-    @Override
-    public void copy(Track from, Track to) {
-        to.setGroups(from.getGroups());
-    }
-
     /**
      * Makes a new track object
      * @param name The name of the track
      * @return a new {@link Track} object
      */
     @Override
-    public Track make(String name) {
+    public Track apply(String name) {
         return new Track(name);
     }
 }