Imported from previous forum
is there a prerense map for each group field in a message in Fast 1.1?
Janaka,
is there a prerense map for each group field in a message in Fast 1.1?
when you say “group field” I assume you mean a group as a whole not the individual fields in a group. The short answer is:
“yes, if any of the fields in the group requires a pmap bit”
(I’ve included the relevant specification text below)
/Rolf
Section 6.2.6 (page 12) of the FAST 1.1 specification says:
"6.2.6 Group Field Instruction
A group field instruction associates a name and presence attribute with a group of instructions. If any instruction of the group needs to allocate a bit in a presence map, the group is represented as a segment in the transfer encoding.
It is not required that the current application type has a corresponding notion of a group. This means that the fields resulting from decoding the group can possibly be flattened into one layer in the application type.
The main purpose of the group field instruction is to enable a single bit in the presence map to indicate the presence of a whole group of fields."