How to encode msgKey attribute in RFA Java

Catherine Wong

RFA Java provides the OMMAttribInfo.getAttrib() method, but not setAttrib() method. What should I do to set the Attrib to OMMAttribInfo object?

Nipat Kunvutipongsak

@Catherine Wong

According to the document (<RFA_PACKAGE>/Docs/refman/rfajava/com/reuters/rfa/omm/OMMEncoder.html), if the application wants to encode attrib, it must not specify the second parameter as OMMTypes.NO_DATA.

encodeMsgInit
void encodeMsgInit(OMMMsg msg,
                   short attibDataType,
                   short dataType)

OMMMsg encoding initialization


Parameters:

msg - the message to be encoded.

attibDataType - the data type that is contained in the OMMAttribInfo. OMMTypes.NO_DATA if encoded OMMAttribInfo will not contain OMMData (i.e. OMMAttribInfo.getAttrib()).

dataType - the data type that is contained in the message. OMMTypes.NO_DATA if encoded message will not contain data.

Referring to RFA Java RDM Usage guide, OMMAttribInfo.Attrib is not used in most of domains except a Login domain.

Since the RFA example applications usually manage the administrative domain (Login, Source Directory, and Dictionary) automatically, you can find the simple demonstration from a LoginClient.encodeLoginReqMsg() method of a StarterConsumer example.

Please see the snippet code below:

    private OMMMsg encodeLoginReqMsg()
    {
        OMMEncoder encoder = _mainApp.getEncoder();
        OMMPool pool = _mainApp.getPool();
        encoder.initialize(OMMTypes.MSG, 500);
        OMMMsg msg = pool.acquireMsg();
        msg.setMsgType(OMMMsg.MsgType.REQUEST);
        msg.setMsgModelType(RDMMsgTypes.LOGIN);
        msg.setIndicationFlags(OMMMsg.Indication.REFRESH);
        msg.setAttribInfo(null, CommandLine.variable("user"), RDMUser.NameType.USER_NAME);


        encoder.encodeMsgInit(msg, OMMTypes.ELEMENT_LIST, OMMTypes.NO_DATA);
        encoder.encodeElementListInit(OMMElementList.HAS_STANDARD_DATA, (short)0, (short)0);
        encoder.encodeElementEntryInit(RDMUser.Attrib.ApplicationId, OMMTypes.ASCII_STRING);
        encoder.encodeString(CommandLine.variable("application"), OMMTypes.ASCII_STRING);
        encoder.encodeElementEntryInit(RDMUser.Attrib.Position, OMMTypes.ASCII_STRING);
        encoder.encodeString(CommandLine.variable("position"), OMMTypes.ASCII_STRING);
        encoder.encodeElementEntryInit(RDMUser.Attrib.Role, OMMTypes.UINT);
        encoder.encodeUInt((long)RDMUser.Role.CONSUMER);
        encoder.encodeAggregateComplete();


        // Get the encoded message from the encoder
        OMMMsg encMsg = (OMMMsg)encoder.getEncodedObject();


        // Release the message that own by the application
        pool.releaseMsg(msg);


        return encMsg; // return the encoded message
    }

Below is an application log:

MESSAGE
	Msg Type: MsgType.REQUEST
	Msg Model Type: LOGIN
	Indication Flags: REFRESH
	Hint Flags: HAS_ATTRIB_INFO
	AttribInfo
		Name: U0154418
		NameType: 1 (USER_NAME)
		Attrib
			ELEMENT_LIST
				ELEMENT_ENTRY ApplicationId: 256
				ELEMENT_ENTRY Position: 10.42.85.159/U0154418-TPL-A
				ELEMENT_ENTRY Role: 0
	Payload: None

Hope this helps!

zoya faberov

In RFA Java 8 kit, please see framework => provider => DictionaryStreamItem:

...

OMMAttribInfo attribInfo = pool.acquireAttribInfo();

attribInfo.setServiceName(_dictMgr.getServiceName());

attribInfo.setName(_name);

attribInfo.setFilter(filter); // Specifies all of the normally needed

// data will be sent.

msg.setAttribInfo(attribInfo);

enc.encodeMsgInit(msg, OMMTypes.NO_DATA, OMMTypes.SERIES); // Data is

...

Catherine Wong

https://community.developers.refinitiv.com/discussion/comment/5949#Comment_5949

@zoya.farbefov

Thanks, but if I just want to add ElementList in the msgKey too? How can I set it to OMMAttribInfo object. It provides setFilter(), setId(), setName(), setNameType(), setServiceID() and setServiceName() only.

zoya faberov

https://community.developers.refinitiv.com/discussion/comment/5953#Comment_5953

I think you are looking to encode ElementList into message itself ( you are writing a provider) as OMMAttribInfo is designed to provide optional attributes/hints.

Please see in reference OMMEncoder for specifics on how to encode and complete on OMMData, OMMEelemntList is OMMData.

Please see example of Series encoding in provider => DictionaryStreamItem, it is the same approach.

Catherine Wong

https://community.developers.refinitiv.com/discussion/comment/6002#Comment_6002

It looks like what I want. I can attach some parameters in msg.Attrib along with the request message.

MESSAGE
	Msg Type: MsgType.REQUEST
	Msg Model Type: Unknown Msg Model Type: 254
	Indication Flags: REFRESH
	Hint Flags: HAS_ATTRIB_INFO | HAS_QOS_REQ
	QosReq: (RT, TbT)
	AttribInfo
		ServiceId: 1
		Name: CW_TEST_CUSTOM_RIC
		NameType: 1
		Attrib
			ELEMENT_LIST
				ELEMENT_ENTRY startDate: 01/01/2016
				ELEMENT_ENTRY stopDate: 25/02/2016
				ELEMENT_ENTRY threshold: 3
	Payload: None