Eikon Desktop SDK IRealtimeUpdateDictionary – how to determine which Service the Update originates?

Hi all,

I have subscribed to the same RIC code from two different services, how can I differentiate between them in my OnDataUpdated method from theIRealtimeUpdateDictionary variable ? Can’t see any kind of service qualifier in the InstrumentUpdates...

Thanks!

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Accepted answers

umer.nalla

Hi Denis,

Thanks for the reply - most useful.

I am using a single IDataServices and multiple IRealtimeDataSubscription instances. Just to clarify when I said 'two different services' I meant two different service names / sources e.g. 'IDN_RDF' and 'IDN_DELAY'.

Also, with regards the suggested solution I dont know if I was doing something wrong, but I seemed to get an occasional mismatch in the update handler between the passed in ric string and the contents of the IRealtimeDataSubscription, so I decided to ditch the ric string and just go with the following:

private void OnDataUpdated(
IRealtimeDataSubscription updateSub,
IRealtimeUpdateDictionary update) //on data updated event
{
String qualRic = updateSub.Feed + "." + updateSub.Rics.First();
....

IRealtimeDataSubscription ricSub = null;
ricSub = realtime.SetupDataSubscription(ricCode) // setup the subscription you want
.WithFields(new[] { "BID", "ASK", "ACVOL_1" }) // add fields you want to subscribe to (without this line, the default is all)
.WithFeed(selectedSvc)
.OnDataUpdated(update => this.OnDataUpdated(ricSub, update))
.OnError(OnError)
.CreateAndStart(); //create and start subscription

The above appears to be working fine.

Thanks and Regards,
Umer

All comments

Denis Dollfus

Hi Umer,

I understand that you create multiple instances of IDataServices. For performance reason I recommend sharing the same IDataServices instance and launching different subscriptions on it.

To answer your question: you can customize the callback signature using the convenient closure C# feature as shown below. In this example I pass RIC and subscription to the callback, this can be generalized to any variable you would like to see in your callback.

private void Subscribe(string ric)
{
// Create and start a realtime subscription
this.subscription = this.dataServices.Realtime.SetupDataSubscription(ric)
.WithFields("ASK", "BID")
.OnDataUpdated(update => this.MyCallback(ric, this.subscription, update))
.CreateAndStart();
}

private void MyCallback(string ric,
IRealtimeDataSubscription realtimeDataSubscription,
IRealtimeUpdateDictionary update)
{
// Process data here
}

umer.nalla

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