[EMA C++]How to get seqNum in RefreshMsg and updateMsg

luxiangyuan
luxiangyuan
in EMA

hello

I develop with EMA C++

I want get seqNum of the RefreshMsg and UpdateMsg, what should I do.

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Best Answer

  • moragodkrit.chumsri_1
    moragodkrit.chumsri_1
    Answer ✓

    @luxiangyuan

    Basically, the OMM message structure, it has a seqNum attribute in the message header. However, this attribute is managed by the server side (feed/exchange) and EMA does not generate the seqNum. Please note that some exchanges increase the value by 2 or by 16.

    For EMA C++, you can verify whether or not the RefreshMsg or UpdateMsg contains sequence number by calling method hasSeqNum() and then get the sequence number by calling method getSeqNum(). Below is sample codes to get the sequence number from Refresh message. 

    if (refreshMsg.hasSeqNum())
    {
      cout << endl << "Sequence Number:" << refreshMsg.getSeqNum() << endl;
    }

Answers

  • luxiangyuan
    luxiangyuan

    it works

    thank you very much

  • cdefusco
    cdefusco

    If this as described "this attribute is managed by the server side (feed/exchange) and EMA does not generate the seqNum" is there another similar mechanism but handled directly by EMA?
    (Eg:timestamp, Ema's seqNum, ecc)

  • umer.nalla
    umer.nalla

    Hi @cdefusco

    Our realtime APIs are 'content neutral' and pass the data to your callbacks as they are received from the server / provider and therefore don't add additional information such as Sequence Number / Timestamp etc.

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