Comments (3)
The current SOF version shows explicit codes for SBE Version 1.0 but a range of codes for other Technical Standards such as FAST (0xFA01 – 0xFAFF). Would that avoid the need to release a new version of SOF for every new version of SBE? Or would it make sense to remove the version of the Technical Standard as other Technical Standards have a single code but also no version. It would then be up to the parser for the given encoding to identify the version. It looks like we do not have a consistent approach here.
from fix-simple-binary-encoding.
I can envision a gradual migration during which SBE 1.0 and 2.0 messages are mixed. Having the payload encoding version in the SOFH would allow a fast switch of parsers.
Generically, a parser can determine version of many protocols. However currently, SBE version is in the message schema (out-of-band metadata) but not on the wire, and the version 2.0 header is not back-compatible with 1.0.
Some Internet protocols deal with this problem by having a base header chained to optional extensions. A decoder follows the chain until there are no more headers. Should we consider this approach for SBE, or is it overkill?
For an example, see RFC 7045
from fix-simple-binary-encoding.
Now I think that adding an SOFH value for SBE 2.0 is unnecessary. Although versions 1.0 and 2.0 have slightly different wire formats, the beginning of the message header in 2.0 is the same as the 1.0 header. Therefore, a message header decoder can read the schema ID and version using the same logic for both. Once the schema is determined, metadata for the schema can be referenced to determine its SBE version. Therefore, what is really needed is an attribute in <schema>
element giving the SBE wire format version. It can default to the current SBE version in the XML schema, e.g. 2.0.
from fix-simple-binary-encoding.
Related Issues (20)
- Version 2 XML schema proposal HOT 1
- Invalid character in the v2-0-RC3\resources\xsd\sbe-2.0rc3.xsd HOT 1
- Possibly redundant "description" attrubute in the "semanticAttributes" attributeGroup HOT 5
- Decimal number representation for monetary amounts
- Version 2 RC schema does not allow semanticType on encoding types
- Clarify offset and length related types HOT 5
- How extension mechanism is supposed to work when dimension type is unknown? HOT 7
- Improve variadic-length field specification HOT 1
- Why is nullValue not allowed for required field? HOT 4
- Questions about common field attributes HOT 2
- How unique should message member's `id` be? HOT 3
- Why `symbolicName_t` is limited to 64 chars? HOT 3
- Can enum/set be optional? HOT 2
- Question: Forward compatibility between encoder code and schema version HOT 1
- Can `<field>` override presence of its type? HOT 2
- Schema extension mechanism violation
- SBE 2.0 features in 1.0 spec HOT 1
- Should `ref` use custom offset of the referred type?
- Better version constraints
- Ownership
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from fix-simple-binary-encoding.