Token Refresh via EMA

rares_patacean

We’re using EMA to connect to HMDS, and for authentication we pass a PingID token as the username. This works correctly during the initial connection, and we’re able to authenticate and consume data without issues.
However, once the token expires and needs to be refreshed, we haven’t found a way to update the username on an existing OmmConsumer. As a result, if a disconnect occurs after the original token has expired, the consumer fails to log in and we’re forced to create a new OmmConsumer instance.
Do you know if there is a mechanism to refresh the username — in our case, the token — on an already instantiated OmmConsumer so that the updated token is used for subsequent reconnect attempts?
Thank you.

wasin.w V3

Hello @rares_patacean

How did you connect to HMDS? Basically, if an EMA application connects to the RTDS with DACS server, an application can put the DACS username via the following statement:

consumer  = EmaFactory.createOmmConsumer(config.host("ADS:RSSL_PORT").username("DACS_USERNAME"));

Example ex100_MP_Streaming for EMA Java (Con100 for EMA C++ and C#)

If an application connects to the Real-Time Optimized (RTO) using the Version 2 Authentication (Client-ID and Client-Secret), an application can put the client-id and client-secret here. Then an API automatically performs authorization with RDP, applies access token, and refresh a token for an application. An application does not need to send HTTP request to RDP for authentication, refresh token and re-login with the RTO server manually.

• Note: This behavior is unlike WebSocket that you need to manual do everything. The EMA API manages all login and refresh process for you.

consumer  = EmaFactory.createOmmConsumer(config.consumerName("Consumer_1").clientId(clientId).clientSecret(clientSecret));

Examples:

• ex450_MP_QueryServiceDiscovery for EMA Java (Con450 for EMA C++ and C#)
• ex113_MP_SessionMgmt for EMA Java (Con113 for EMA C++ and C#) ← The easiest example
• ex451_MP_OAuth2Callback_V2 for EMA Java (Con451 for EMA C++ and C#)

I do not know what kind of HMDS server is? Why do you need to send an access token manually?