[This message was posted by Ravi Ravisankar of IBM <[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/eb9ff34c - PLEASE DO NOT REPLY BY MAIL.]
Rolf, I used configuration settings to do things differently for OPRA where it deviates from the spec., so that the code remains same with very few cmp and jmp. >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 -~----------~----~----~----~------~----~------~--~---
