@Override
    public void invalidateCaches() {
        // invalidate for all changes
        this.parent.getCachedData().invalidate();
    }
Implements {@link LPSubject} for a {@link PermissionHolder}.
sponge/src/main/java/me/lucko/luckperms/sponge/service/model/permissionholder/PermissionHolderSubject.java