When user code receives an rfa::common::Event event and if it's a rfa::data::FieldListEnum data, can user assume that a FieldList data any time should only contain either BID or ASK side data? Not both?
Hello @ming.cheng
Please be informed that I am not a Market data expert, so I might not fully understand your ask side or bid side term.
Subscribing to the market data services is usually the best way to view what the actual Market Price FieldList data look like. I strongly suggest you try the RFA C++ StartConsumer example (in the API package) or the RFA C++ Tutorial application to connect to your Refinitiv Real-Time Market Data system and see the real data feed. It is a better way than just reading the specification.
In the Refinitiv Real-Time system, the Market Price data domain's FieldList does not contain duplicate fields (whatever the field/FID is). If data is available, it always presents in the FieldList only 1 time (1 BID, 1 ASK, 1 DSPLY_NAME, 1 ACVOL_1, etc).
I hope this help.
It is the expected behavior of Refinitiv Real-Time that sends any fields that are updated to the API in the Update Message. The application cannot expect that some FIDs are always available in the Update.
I recommend that the client programmatically check incoming FIDs/Fields data from the incoming FieldList payload. The client can find more detail from the RFA C++ Tutorial 7 - MarketPrice Refinitiv Data Model (RDM), Part 2 tutorial page.I hope this helps.
Yes, it is possible. If the backend (RTDS/OMM Provider)/Refinitiv Real-Time sends BID and ASK data to the API in the same Update message.
The example is as follows:
BatchViewItemManager.processEvent: Received Item Event...MESSAGE Msg Type: MsgType.UPDATE_RESP Msg Model Type: MARKET_PRICE Indication Flags: Hint Flags: HAS_RESP_TYPE_NUM | HAS_SEQ_NUM SeqNum: 35264 RespTypeNum: 1 (QUOTE) Payload: 19 bytes FIELD_LIST FIELD_ENTRY 22/BID: 36.75 FIELD_ENTRY 25/ASK: 37.00
However, it is possible that the backend (RTDS/OMM Provider)/Refinitiv Real-Time sends only BID or ASK field in the Update message like in the following examples too:
BatchViewItemManager.processEvent: Received Item Event...MESSAGE Msg Type: MsgType.UPDATE_RESP Msg Model Type: MARKET_PRICE Indication Flags: Hint Flags: HAS_RESP_TYPE_NUM | HAS_SEQ_NUM SeqNum: 35168 RespTypeNum: 1 (QUOTE) Payload: 13 bytes FIELD_LIST FIELD_ENTRY 25/ASK: 37.00....BatchViewItemManager.processEvent: Received Item Event...MESSAGE Msg Type: MsgType.UPDATE_RESP Msg Model Type: MARKET_PRICE Indication Flags: Hint Flags: HAS_RESP_TYPE_NUM | HAS_SEQ_NUM SeqNum: 35184 RespTypeNum: 1 (QUOTE) Payload: 13 bytes FIELD_LIST FIELD_ENTRY 22/BID: 36.75
Note:
Hi Wasin,
Thanks and now I got some idea. However I'd like to confirm further the following points:
If not sure about FID content, please leave item 2 and focus on 1 and 3. In fact even item 2 is more on concept than actual FID usage.
Please see the answers below:
Question 1: So user code can receive an update of FieldList containing BID and ASK data. May I say at most 1 BID and 1 ASK? Is it possible that a FieldList could contain m BID and n ASK?
Answer: Do you mean "Is it possible that a FieldList could contain multiple BID and ASK?"?
Please be informed that the FieldList doe not contain duplicate FIDs. Each FID presents in a FieldList only 1 time as follows:
If the application subscribes a Market Price item for BID and ASK fields to Refinitiv Real-Time, 1 incoming FieldList data can be the following scenarios (depending on how the exchange/feed/server sends data to the API):
Example with subscription PTT.BK and SCB.BK Market Price with View feature (BID and ASK):
BatchViewItemManager.processEvent: Received Item Event...MESSAGE Msg Type: MsgType.UPDATE_RESP Msg Model Type: MARKET_PRICE Indication Flags: Hint Flags: HAS_ATTRIB_INFO | HAS_RESP_TYPE_NUM | HAS_SEQ_NUM SeqNum: 35776 RespTypeNum: 1 (QUOTE) AttribInfo ServiceName: API_ELEKTRON_EDGE_TOKYO ServiceId: 4591 Name: PTT.BK NameType: 1 (RIC) Payload: 13 bytes FIELD_LIST FIELD_ENTRY 25/ASK: 37.25BatchViewItemManager.processEvent: Received Item Event...MESSAGE Msg Type: MsgType.UPDATE_RESP Msg Model Type: MARKET_PRICE Indication Flags: Hint Flags: HAS_ATTRIB_INFO | HAS_RESP_TYPE_NUM | HAS_SEQ_NUM SeqNum: 10928 RespTypeNum: 1 (QUOTE) AttribInfo ServiceName: API_ELEKTRON_EDGE_TOKYO ServiceId: 4591 Name: SCB.BK NameType: 1 (RIC) Payload: 19 bytes FIELD_LIST FIELD_ENTRY 22/BID: 107.50 FIELD_ENTRY 25/ASK: 108.00...BatchViewItemManager.processEvent: Received Item Event...MESSAGE Msg Type: MsgType.UPDATE_RESP Msg Model Type: MARKET_PRICE Indication Flags: Hint Flags: HAS_ATTRIB_INFO | HAS_RESP_TYPE_NUM | HAS_SEQ_NUM SeqNum: 35840 RespTypeNum: 1 (QUOTE) AttribInfo ServiceName: API_ELEKTRON_EDGE_TOKYO ServiceId: 4591 Name: PTT.BK NameType: 1 (RIC) Payload: 13 bytes FIELD_LIST FIELD_ENTRY 22/BID: 37.00
I highly recommend you find more detail from Section "9 – Fields are described by dictionaries" of the 10 important things you need to know before you write a Refinitiv Real-Time application article.
The RFA API C++ StartConsumer_BatchView example application is also a good example that you can test and experiment with various options of items and fields subscription.
Question 2: Within a FieldList, there is an update timestamp (for example either FID 1025 or FID 14265; or both conceptually one bcos user should use only one of them)? And this timestamp is applicable to all BID/ASK data within the same FieldList
Answer: I am sorry that I am not a Real-Time content expert, so I highly recommend you contact the Content Support team. The Content support team can help you with Real-Time field behavior in more detail. You can contact the team directly via the https://my.refinitiv.com/content/mytr/en/helpandsupport.html website (choose "I need help understanding content within the product" and product "Refinitiv Real-Time").
Question 3: This n possible BID/ASK entries within a FieldList has nothing to do with the subscription method/options used
Answer: I do not understand what the question is. Can you clarify this question?
If you mean duplicate FIDs/Fields, the API should not send duplicate FIDs/Fields in a single FieldList to the application.
Since a FieldList can at most contain a BID and a ASK, the item 3 is irrelevant. And we can ignore item 2 also as you said no duplicated FID in any FieldList. Then ans to item 2 should be clear also.
Thanks a lot!
wasin.w
I'd like to touch this topic again. I should have made it clear that what I meant by BID/ASK is not Refinitiv' BID/ASK FIDs. Instead they are bid side or ask side market data include price and size.
So come to my original concern again that would a FIELDLIST object possibly contain multiple bid and/or ask groups of data? Hope at most 1 bid side and 1 ask side data in a FieldList object.
Keen to have your clarification.
let's close it. thanks for your patience。
