protected void handleDeleteCompletion(Operation op){
  op.nestCompletion(null);
  handleStop(op);
}

protected void handleDeleteCompletion ( Operation op ) { op . nestCompletion ( null ) ; handleStop ( op ) ; }
runs after a delete operation , that is not a service stop , completes . it guarantees that the handlestop handler will execute next , and the shared completion that stops the service will run after the stop operation is completed
