Imported from previous forum
Hey everybody.
Just got confused about dictionaries. Do I have to maintain one (and just one) global dictionary for decoding EUREX EBS-FAST-message streams?
In the EBS-Specification is a sentence that says: All the operators share the same dictionary regardless of the template and application type.
and there is another: For the same message type, FAST
compression will be applied to the fields from the second
message.
What I did not get is: is there one dictionary for each message type or not? Is message type matching to templates in this case? But then there would be a hint to different ditionaries for each template in the template, well there is no one… confused
Bye
Martin
[ original email was from Zoltan Vekony - zoltan.vekony@web.de ]
Hi Martin,
yes, there is only one global dictionary in Eurex EBS. Because Eurex EBS distributes the information in form of multicast datagrams, the dictionary is valid only for one datagram. Inside one datagram there can be more FAST reset message, which resets the dictionary. There is no template specific dictionary.
Bye
Zoltan
Hey everybody.
Just got confused about dictionaries. Do I have to maintain one (and
just one) global dictionary for decoding EUREX EBS-FAST-message streams?
In the EBS-Specification is a sentence that says: All the operators
share the same dictionary regardless of the template and application
type. and there is another: For the same message type, FAST compression
will be applied to the fields from the second message.What I did not get is: is there one dictionary for each message type or
not? Is message type matching to templates in this case? But then there
would be a hint to different ditionaries for each template in the
template, well there is no one… confusedBye Martin
Hi,
I’m a little bit confused about this issue…
Taking into account both the FAST documentation, and the FAST Message Templates provided as Appendix of the Eurex - Enhanced Broadcast Solution handbook, I would say there is no a global dictionary, but one dictionary per Application Type (that in the case of EBS it should correspond to one dictionary per Template).
In fact w.r.t. the FAST handbook sections [5 Application Types], [6.1 Instruction Context] and [6.3.1 Dictionaries and Previous Values], each time the FAST engine encounters an element containing a td:typeRef element it should change dictionary…
Please let me know if I’m making a mistake.
Thanks in advance,
– Ale
Hi Martin,
yes, there is only one global dictionary in Eurex EBS. Because Eurex EBS
distributes the information in form of multicast datagrams, the
dictionary is valid only for one datagram. Inside one datagram there can
be more FAST reset message, which resets the dictionary. There is no
template specific dictionary.Bye Zoltan
Hey everybody.
Just got confused about dictionaries. Do I have to maintain one (and
just one) global dictionary for decoding EUREX EBS-FAST-message
streams? In the EBS-Specification is a sentence that says: All the
operators share the same dictionary regardless of the template and
application type. and there is another: For the same message type,
FAST compression will be applied to the fields from the second
message.What I did not get is: is there one dictionary for each message type
or not? Is message type matching to templates in this case? But then
there would be a hint to different ditionaries for each template in
the template, well there is no one… confusedBye Martin
[ original email was from Zoltan Vekony - zoltan.vekony@web.de ]
Hi,
the Eurex Spec. says (Page 19):
Please note, that EBS uses global dictionary scope far FAST operators. All the operator share the same dictionary regardless of the template and application type. …
Bye
Zoltan
Hi, I’m a little bit confused about this issue… Taking into account
both the FAST documentation, and the FAST Message Templates provided as
Appendix of the Eurex - Enhanced Broadcast Solution handbook, I would
say there is no a global dictionary, but one dictionary per Application
Type (that in the case of EBS it should correspond to one dictionary per
Template). In fact w.r.t. the FAST handbook sections [5 Application
Types], [6.1 Instruction Context] and [6.3.1 Dictionaries and Previous
Values], each time the FAST engine encounters an element containing a
td:typeRef element it should change dictionary…Please let me know if I’m making a mistake. Thanks in advance, – Ale
Hi Martin,
yes, there is only one global dictionary in Eurex EBS. Because Eurex
EBS distributes the information in form of multicast datagrams, the
dictionary is valid only for one datagram. Inside one datagram there
can be more FAST reset message, which resets the dictionary. There is
no template specific dictionary.Bye Zoltan
Hey everybody.
Just got confused about dictionaries. Do I have to maintain one (and
just one) global dictionary for decoding EUREX EBS-FAST-message
streams? In the EBS-Specification is a sentence that says: All the
operators share the same dictionary regardless of the template and
application type. and there is another: For the same message type,
FAST compression will be applied to the fields from the second
message.What I did not get is: is there one dictionary for each message type
or not? Is message type matching to templates in this case? But then
there would be a hint to different ditionaries for each template in
the template, well there is no one… confusedBye Martin