[This message was posted by Rolf Andersson of Pantor Engineering <[email protected]> to the "FAST Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply to it on-line at http://fixprotocol.org/discuss/read/cc7b8375 - PLEASE DO NOT REPLY BY MAIL.]
Ravi, thank you for your comments. How do you communicate to your common decoder about: - The fixed presence bit offsets - The added skip logic required for 'k' messages Do you use extensions to the template spec or do you use some other configuration mechanism? Best, Rolf > Rolf, We decided to have a common decoder for all the FAST feeds. > Since OPRA FAST implementation is non-standard, it posed challenges > in the following area: > > 1. Lack of templates for messages. OPRA defines FAST fields and > messages in header files. We generated templates for OPRA messages > from the header files, so that the common decoder could consume it. > > 2. The presence offset for a field in the PMAP is static and based > on field id. This is a deviation from FAST specification, but can > be handled in the decoder logic. (Adds a cmp and jmp instructions > in the presence bit lookup, not very bad!) > 3. Messages k and Y (OPRA actually discontinued this message now) > needs special processing. Both include/exclude some fields > conditionally, based on runtime value of another field. > >> Ravi, >> >> thank you for your comments. Would it be possible for you to >> share some thoughts regarding the OPRA impl? What did you do to >> efficiently support the non-std aspects of OPRA? >> >> Best, Rolf [You can unsubscribe from this discussion group by sending a message to mailto:[email protected]] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Financial Information eXchange" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/FIX-Protocol?hl=en -~----------~----~----~----~------~----~------~--~---
