EMA Batch request with fieldNames in the elementList

sagar.s
sagar.s
in EMA

In the EMAJavaBatchViewExample provided, for the following code snippet, the fieldIds 22 and 25 are given as input to "array" variable. Is there an option to provide FieldNames instead?

AppClient appClient = new AppClient();

consumer = EmaFactory.createOmmConsumer(EmaFactory.createOmmConsumerConfig().host("10.67.4.28:14002").username("user"));

ElementList batchView = EmaFactory.createElementList();

OmmArray array = EmaFactory.createOmmArray();

array.fixedWidth(2); array.add(EmaFactory.createOmmArrayEntry().intValue(22)); array.add(EmaFactory.createOmmArrayEntry().intValue(25));

OmmArray arrayI = EmaFactory.createOmmArray();

arrayI.add(EmaFactory.createOmmArrayEntry().ascii("AUD=")); arrayI.add(EmaFactory.createOmmArrayEntry().ascii("JPY=")); batchView.add(EmaFactory.createElementEntry().array(EmaRdm.ENAME_BATCH_ITEM_LIST, arrayI)); batchView.add(EmaFactory.createElementEntry().uintValue(EmaRdm.ENAME_VIEW_TYPE, 1)); batchView.add(EmaFactory.createElementEntry().array(EmaRdm.ENAME_VIEW_DATA, array));

consumer.registerClient (EmaFactory.createReqMsg().serviceName("ELEKTRON_EDGE").payload(batchView), appClient);

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Best Answer

  • umer.nalla
    umer.nalla
    Answer ✓

    Hi @sagar.s

    You can find a list of all the FIDs and Field Names in the RDMFieldDictionary file that comes with the ElektronSDK (in the etc folder). The normal usage scenario is that developers identify the FIDs from the above file and use them in their application code.

    IF you really do need to search for fieldnames and obtain the FID in your code, then you could implement some code to iterate through the DataDictionary, matching on the field name to obtain the FID.

    Please see the following post - which talks about programmatic access to the DataDictionary.

    New Data Dictionary interface in EMA C++

    Similar functionality also exists in the latest version of EMA Java.

    Note that the Field Name is accessed via the acronym() method of the DictionaryEntry.

Answers

  • umer.nalla
    umer.nalla

    Hi @sagar.s

    Only FIELD IDs are supported at present for domains that use FieldLists for the Payload

    ElementName names can be used for domains that use ElementList for the Payload

    If you try changing the view type to 2 e.g.

    add(EmaFactory.createElementEntry().uintValue(EmaRdm.ENAME_VIEW_TYPE, 2)

    for your MarketPrice request, the Item Status code will report Unsupported View Type and return all the Fields (unfiltered):

    Item State: Open / Ok / Unsupported view type / 'All is well'

  • sagar.s
    sagar.s

    @Umer Nalla


    Is there a function call to retrieve field Ids for given field names?

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