Setting up a Listener

HydraExpress Components : Web Service Development Guide : PART III Working with Message Patterns : Solicit-Response and Notification Services : Implementing the Client : Setting up a Listener

The first task during the client initialization is to set up a listener so the client can receive request messages from the server. Notification and solicit-response require the server to establish the connection and the client to be listening for it.

rwsf::MessageHandler service =

rwsf::HandlerManager::findHandler("WeatherSummaryNotificationService"); //1

rwsf::MessageListener listener; //2

if (transportName.empty()) {

listener = rwsf::TransportManager::findListenerByUrl(location);

} else {

listener = rwsf::TransportManager::findListener(transportName);

}

if (listener.isValid()) { //3

std::cout << "Starting Listener..." << std::endl << std::endl;

listener.setHandler(service);

listener.start();

}

else {

std::cerr << "Unable to find a listener of name: "

<< transportName << std::endl;

std::cerr << "Exiting." << std::endl;

return 1;

}

//1 Creates a service handler for the client. The handler WeatherSummaryNotificationService is defined in the generated file client-handlers.xml.

//2 Creates a listener object based on whether the information available is a transport name or a location.

//3 If the constructed listener is confirmed as valid, starts the listener, and registers the service handler.