IO2GResponseListener

interface IO2GResponseListener

Brief

The interface provides method signatures to process notifications about request completions, request failures and tables updates.

Details

Responses come from the trading server in two ways:

A response provided by the server as an answer to a user request.
Requests may be successfully completed or failed:
- to process notifications about successful request completion, you must use the onRequestCompleted method;
- to process notifications about requests failures, you must use the onRequestFailed method.
A response provided by the server as a result of trading tables updates.
To process these notifications, you must use the onTablesUpdates method.

For complete details of processing the response contents, refer to the O2GResponse class documentation.

If you want to use the methods of the IO2GResponseListener interface, you must create a class that implements the interface. For example,
public class ResponseListener implements IO2GResponseListener { }

An instance of the class implementing the IO2GResponseListener interface must be subscribed to a session object. It is accomplished by calling the O2GSession.subscribeResponse method. For example,
mSession = O2GTransport.createSession();
ResponseListener responseListener = new ResponseListener(mSession);
mSession.subscribeResponse(responseListener);

The subscribed instance must be unsubscribed from a session object after calling the O2GSession.logout method, but before calling the O2GSession.Dispose method. It is accomplished by calling the O2GSession.unsubscribeResponse method.
For example,

mSession.logout(); mSession.unsubscribeResponse(responseListener); mSession.dispose();

For the interface implementation details, see the example below.

Example

Process notifications about the request to get offers and live offers updates [show]

Process notifications about the request to get offers and live offers updates [hide]

using System;
using System.Collections.Generic;
using System.Text;
using fxcore2;
 
namespace GetOffers
{
    class ResponseListener : IO2GResponseListener
    {
        private O2GSession mSession;
 
        public ResponseListener (O2GSession session)
        {
            mSession = session;
        }
 
        public void onRequestCompleted(string requestID, O2GResponse response)
        {
            if (response.Type == O2GResponseType.GetOffers)
            {
                printOffers(response);
            }
        }
 
        public void onRequestFailed(string requestID, string error)
        {
            Console.WriteLine("Request failed. requestID= {0}; error= {1}", requestID, error);
        }
 
        public void onTablesUpdates(O2GResponse response)
        {
           printOffers(response);
        }
 
        private void printOffers(O2GResponse response)
        {
            O2GResponseReaderFactory readerFactory = mSession.getResponseReaderFactory();
            if (readerFactory != null)
            {
                O2GOffersTableResponseReader reader = readerFactory.createOffersTableReader(response);
                int i;
                for (i = 0; i < reader.Count; i++)
                {
                    O2GOfferRow row = reader.getRow(i);
                    if (row.isBidValid && row.isAskValid)
                    {
                         Console.WriteLine("{0} {1} {2} {3}", row.OfferID, row.Instrument, row.Bid, row.Ask);
                    }
                }
            }
        }
 
    }
}

The type defined in the fxcore2.dll assembly. The namespace is fxcore2.

Public Methods
onRequestCompleted	Processes a notification about a successful request completion.
onRequestFailed	Processes a notification about a request failure.
onTablesUpdates	Processes notifications about tables updates.

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