code: private void removeFromPermissionsCache(IAuthorizationPrincipal[] principals)
              throws AuthorizationException {
          for (int i = 0; i < principals.length; i++) {
              cacheRemove(principals[i]);
          }
      }
docs: Removes <code>IPermissions</code> for the <code>IAuthorizationPrincipals</code> from the
  cache.
  
  @param principals IAuthorizationPrincipal[]