Max length of RSSL string payload

ben.hyde
ben.hyde
in Elektron

Is there a max length for the payload of an ASCII_STRING / RMTES_STRING field?

All I can see documentation-wise is the table "5.5.2.4 FIELD TYPE Keywords" in the "RDM Usage Guide" but I'm reading that as how to convert MarketFeed types to RWF?

I'm inferring (/hoping) from reading the SDK code that string length is only limited by the UInt32 length member of RwfBuffer and EmaString?

Also, is there any max cachable length for these types in the ADH?

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Best Answer

  • Jirapongse
    Jirapongse
    Answer ✓

    @ben.hyde

    I tested with ADS and found that its cache can contain a long string (400 bytes). However, it is better to contact the RTDS support team directly via MyRefinitiv to confirm it.

    Yes, you can specify custom fields for your own data. The field IDs of custom fields must be negative values. Please check the Publish Custom Data via Refinitiv Real-Time Distribution System by EMA article regarding the FID Number Policy. However, you need to make sure that the providers, RTDS, and consumers load and use this dictionary.

    Otherwise, you can use existing fields. For example:

    SEG_TEXT   "TEXT"                 258  NULL        ALPHANUMERIC      255  RMTES_STRING   255
    SEG_TEXT_2 "SEG TEXT 2"          1059  NULL        ALPHANUMERIC      255  RMTES_STRING   255
    SEG_TEXT_3 "SEG TEXT 3"          1060  NULL        ALPHANUMERIC      255  RMTES_STRING   255
    INSTFUNAM1 "INSTR FULL NAME 1"  15433  NULL        ALPHANUMERIC      350  RMTES_STRING   350
    INSTFUNAM2 "INSTR FULL NAME 2"  15434  NULL        ALPHANUMERIC      350  RMTES_STRING   350
    KEYWORD    "KEYWORD"            30019  NULL        ALPHANUMERIC      510  RMTES_STRING   510
    ADMIN_MSG  "ADMIN MSG"          32423  NULL        ALPHANUMERIC      500  RMTES_STRING   500


Answers

  • Jirapongse
    Jirapongse

    @ben.hyde

    Thank you for reaching out to us.

    Technically, the content of each field entry has a maximum encoded length of 65,535 bytes.

    However, the application should follow the length defined in the data dictionary (RDMFieldDictionary).

    For example:

    !
    !ACRONYM    DDE ACRONYM          FID  RIPPLES TO  FIELD TYPE     LENGTH  RWF TYPE   RWF LEN
    !-------    -----------          ---  ----------  ----------     ------  --------   -------
    DSPLY_NAME "DISPLAY NAME"           3  NULL        ALPHANUMERIC       16  RMTES_STRING    16

    The RWF LEN (RWF maximum field length (for caching)) of the DSPLY_NAME field is 16 bytes so the length of content in the DSPLY_NAME field shouldn't exceed 16 bytes.

  • ben.hyde
    ben.hyde

    Thanks @Jirapongse.

    I should have specified that I'm using a custom dictionary. I'm wanting to populate one FID with a fairly long string (some base64 encoded data). If I know that this string will never exceed, say, 400 bytes, Am I safe to define the field in the dictionary like this (and have the full value cached in the ADH):

    !ACRONYM  DDE ACRONYM FID RIPPLES TO FIELD TYPE LENGTH RWF TYPE     RWF LEN
    !-------  ----------- --- ---------- ---------- ------ --------     -------
    SOME_DATA ""           42 NULL       NONE            0 RMTES_STRING     400
  • ben.hyde
    ben.hyde
    @Jirapongse that's great. Thanks for your help
  • Unknown
    Unknown

    The maximum length of an RSS (Rich Site Summary) or XML string payload can vary depending on the specific implementation and constraints of the system processing it. Charter Spectrum internet Typically, there's no strict maximum length defined for RSS strings, but it's good practice to keep payloads concise to ensure efficient processing and compatibility across different platforms and devices.


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