code: protected void unsetDeferrableScheduledExecutor(ServiceReference<ScheduledExecutorService> ref) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(tc, "unsetDeferrableScheduledExecutor", ref);
          deferrableSchedXSvcRef.unsetReference(ref);
      }
docs: Declarative Services method for unsetting the deferrable scheduled executor service reference.
  
  @param ref reference to the service