SBE

What tool should be used to generate stubs from  schema?

MarketFactory recommends using the RealLogic SBETool. It should be noted that we use v1.25.1 to avoid a bug in the CME ilink3 schema that is revealed with later versions of the tool, but clients are free to use later versions.

The breaking change was introduced in SBE Tool v1.25.2, as described in RealLogic issues #889 and #917:  because it is impossible to specify a character value of 0x00 in a valid XML document, the proposed solution, such as it is, is to convince CME to remove the null_value="0" attribute from the specification of charNULL in their schema.  This may take a while.

Why does the wire representation of a message appear different to that defined in the schema?

When directly inspecting "on-the-wire" representations of char datatypes - including enumerations which may take numeric values - be aware that these are subject to UTF-8 encoding, and you may be inspecting the decimal code of the given character.

Refer to https://en.wikipedia.org/wiki/UTF-8#Codepage_layout for details.

<enum name="Side" description="Side" encodingType="char">
    <validValue name="Buy">1</validValue>
    <validValue name="Sell">2</validValue>
    <validValue name="TwoWay">7</validValue>
</enum>

You may observe the following values:

• 49 - '1' - Buy
• 55 - '2' - Sell
• 55 - '7' - TwoWay

When I parse/write a string from/to a fixed length SBE field, how do I determine/signal where to truncate?

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