Ema - Batch and View requests to IProvider

We are migrating a Java application IProvider from RFA to EMA, and we have some doubts about Ema IProvider capabilities.
According to RFA documentation (section 3.3.1.1 of rfaj_developerguide.pdf, RFA version 8.2.1.L1) "Interactive providers can receive any consumer-style request described in the consumer section of this document, including item requests, batch requests, views, symbol lists, pause / resume, etc."
Is this supported also by IProviders of Ema library? Testing batch requests and views it seems not:
- For batch requests we have used ex370_MP_Batch for consumer and ex102_MP_Snapshot example for iprovider. We expected the payload of ReqMsg received by the IProvider to contain an ElementList (with EmaRdm.ENAME_BATCH_ITEM_LIST), but DataType is NO_DATA instead.
- For view requests we have used ex360_MP_View for consumer and ex102_MP_Snapshot example for iprovider. We expected the payload of ReqMsg received by the IProvider to contain an ElementList (with EmaRdm.ENAME_VIEW_TYPE and EmaRdm.ENAME_VIEW_DATA), but DataType is NO_DATA instead.
Ema version is 3.6.7.0.
Thank you
Best Answer
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Hello @Daniela Ottino,
EMA iProvider provides the Batch and View capability. These will first have to be advertised in the Login response message, before a consumer can use it. The default login response message does not support Dynamic Views and Batch messages - which is why your consumer application is not sending it.
Modify the iProvider login response like this:
void processLoginRequest(ReqMsg reqMsg, OmmProviderEvent event){
ElementList attrs = EmaFactory.createElementList();
attrs.add(EmaFactory.createElementEntry().uintValue(EmaRdm.ENAME_SUPPORT_VIEW, 1));
event.provider().submit(EmaFactory.createRefreshMsg().domainType(EmaRdm.MMT_LOGIN).name(reqMsg.name()).nameType(EmaRdm.USER_NAME).
complete(true).solicited(true).state(OmmState.StreamState.OPEN, OmmState.DataState.OK, OmmState.StatusCode.NONE, "Login accepted").
attrib(attrs), event.handle());
}and now the consumer request message will appear as:
ReqMsg
streamId="5"
domain="MarketPrice Domain"
name="abc.def"
serviceId="1"
serviceName="DIRECT_FEED"
Payload dataType="ElementList"
ElementList
ElementEntry name=":ViewType" dataType="UInt" value="1"
ElementEntry name=":ViewData" dataType="OmmArray"
OmmArray with entries of dataType="Int" fixed width="2"
value=""22"
value=""25"
OmmArrayEnd
ElementEntryEnd
ElementListEnd
PayloadEnd
ReqMsgEndAlso note the Java version of EMA API does not send a batch request, but instead the SDK requests the individual items.
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