Persistent Service reconnection

edit

I'm using ros hydro.

I call a persistence service in this way:

connectToClassificationServer()
{
     classificationService = n.serviceClient<c_fuzzy::Classification>("classification", true);
}

then I use my service:

if (classificationService.isValid())
{

    classificationService.call(serviceCall);
}
else
{
    ROS_ERROR("Service down, waiting reconnection...");
    classificationService.waitForExistence();
    connectToClassificationServer(); //Why this??
}

the method isValid return always false if I don't re-create the service handler. And apparently there's no way to restart a persistent service (such as a 'reconnect' method).

it is correct to always recreate the ServiceClient? why I need to use the nodeHandler if I've already all the information needed inside the ServiceClient object?