Move #refreshCachedData up the type hierarchy into PermissionHolder

common/src/main/java/me/lucko/luckperms/common/api/delegates/model/ApiGroup.java

@@ -35,7 +35,6 @@ import me.lucko.luckperms.api.Group;
 import me.lucko.luckperms.api.caching.GroupData;
 
 import java.util.OptionalInt;
-import java.util.concurrent.CompletableFuture;
 
 public final class ApiGroup extends ApiPermissionHolder implements Group {
     public static me.lucko.luckperms.common.model.Group cast(Group g) {
@@ -66,11 +65,6 @@ public final class ApiGroup extends ApiPermissionHolder implements Group {
         return handle.getCachedData();
     }
 
-    @Override
-    public CompletableFuture<Void> refreshCachedData() {
-        return handle.getRefreshBuffer().request();
-    }
-
     public boolean equals(Object o) {
         if (o == this) return true;
         if (!(o instanceof ApiGroup)) return false;

common/src/main/java/me/lucko/luckperms/common/api/delegates/model/ApiPermissionHolder.java

@@ -52,6 +52,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.SortedSet;
 import java.util.TreeSet;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Predicate;
 
 @AllArgsConstructor
@@ -77,6 +78,11 @@ public class ApiPermissionHolder implements PermissionHolder {
         return handle.getCachedData();
     }
 
+    @Override
+    public CompletableFuture<Void> refreshCachedData() {
+        return handle.getRefreshBuffer().request();
+    }
+
     @Override
     public ImmutableSetMultimap<ImmutableContextSet, Node> getNodes() {
         return handle.getEnduringNodes();

common/src/main/java/me/lucko/luckperms/common/api/delegates/model/ApiUser.java

@@ -35,7 +35,6 @@ import me.lucko.luckperms.api.User;
 import me.lucko.luckperms.api.caching.UserData;
 
 import java.util.UUID;
-import java.util.concurrent.CompletableFuture;
 
 public final class ApiUser extends ApiPermissionHolder implements User {
     public static me.lucko.luckperms.common.model.User cast(User u) {
@@ -85,11 +84,6 @@ public final class ApiUser extends ApiPermissionHolder implements User {
         return handle.getCachedData();
     }
 
-    @Override
-    public CompletableFuture<Void> refreshCachedData() {
-        return handle.getRefreshBuffer().request();
-    }
-
     @Override
     @Deprecated
     public void refreshPermissions() {

common/src/main/java/me/lucko/luckperms/common/model/PermissionHolder.java

@@ -46,6 +46,7 @@ import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ContextSet;
 import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.common.api.delegates.model.ApiPermissionHolder;
+import me.lucko.luckperms.common.buffers.BufferedRequest;
 import me.lucko.luckperms.common.buffers.Cache;
 import me.lucko.luckperms.common.caching.HolderCache;
 import me.lucko.luckperms.common.caching.MetaAccumulator;
@@ -258,6 +259,8 @@ public abstract class PermissionHolder {
      */
     public abstract HolderCache<?> getCachedData();
 
+    public abstract BufferedRequest<Void> getRefreshBuffer();
+
     /**
      * Forms a HolderReference for this PermissionHolder.
      *