numGroups / numVarDataFields support (SBE spec v2) #1034
Description
The 1.0 specification mentions that the following attributes are part of message headers
Number of repeating groups
A count of repeating groups at the root level of the message. The count does not include nested repeating groups.Number of variable-length fields
A count of the variable-length fields at the root level of the message. The count does not include variable-length fields within repeating groups.
When generating Java encoder/decoder for this schema using 1.33, numGroups and numVarDataFields do not seem to have any special significance.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sbe:messageSchema xmlns:sbe="http://fixprotocol.io/2016/sbe"
package="uk.co.real_logic.sbe.benchmarks"
id="1"
version="1"
semanticVersion="5.2"
description="Example schema"
byteOrder="littleEndian">
<types>
<composite name="messageHeader" description="Message identifiers and length of message root">
<type name="blockLength" primitiveType="uint16"/>
<type name="templateId" primitiveType="uint16"/>
<type name="schemaId" primitiveType="uint16"/>
<type name="version" primitiveType="uint16"/>
<type name="numGroups" primitiveType="uint16" />
<type name="numVarDataFields" primitiveType="uint16" />
</composite>
</types>
<sbe:message name="Car" id="1" description="Description of a basic Car">
<field name="serialNumber" id="1" type="uint32"/>
</sbe:message>
</sbe:messageSchema>
Generated Java code:
public CarEncoder wrapAndApplyHeader(
final MutableDirectBuffer buffer, final int offset, final MessageHeaderEncoder headerEncoder)
{
headerEncoder
.wrap(buffer, offset)
.blockLength(BLOCK_LENGTH)
.templateId(TEMPLATE_ID)
.schemaId(SCHEMA_ID)
.version(SCHEMA_VERSION);
return wrap(buffer, offset + MessageHeaderEncoder.ENCODED_LENGTH);
}
Are numGroups / numVarDataFields not supported ?