Re: [Quickfixj-users] repeating group problem

[Oren M. <or...@qu...>]

Unfortunately the Ruby, Python, and C++ API's do not have a  
MessageFactory.  They were added to the Java and .NET APIs due to  
those languages very strict type checking.  We could probably add a  
MessageFactory to them for this purpose, even though the original use  
case of it isn't relevant to those languages.  A dynamic message  
factory could be pretty cool because we could probably drop the  
requirement of passing a message factory to the initiator/acceptor  
(making all the APIs more similar to each other).  Each session with  
a data dictionary could use a dynamic factory, while ones without  
would just use the default.  I'm not sure if this would create any  
sort of significant performance repercussions.

I'm not sure I necessarily agree about pulling validate out of the  
data dictionary.  I suppose if there is a use case where you want to  
validate against the data dictionary and something else.  If you are  
just validating against a data dictionary however, the validate  
method seems to be in an appropriate location to me.

--oren

On Nov 6, 2006, at 1:01 PM, st...@te... wrote:

>> Dynamically creating groups based on the DataDictionary is an
>> interesting idea.  What do you think of flipping it around a little
>> and turning the DataDictionary into a kind of factory.  I'm thinking:
>>
>> Group group = dataDictionary.createGroup( "X", NoPartyIDs.FIELD )
>>
>> Then you can even add createMessage( "X" ), and createField methods.
>> Could be useful for some use cases that require more dynamic
>> capabilities.
>
> Interesting idea. It would be nice to have a dynamic factory. What  
> about
> using (and extending) the quickfix.MessageFactory with an  
> implementation
> that uses a data dictionary for generating messages and parts of  
> messages
> like groups, components and fields?
>
> The only minor concern I have about adding it to the DataDictionary is
> that this seems to add a new responsibility to the dictionary. I'd  
> even
> like to see validation extracted to a validator class rather than  
> tightly
> coupled to the metadata management provided by the DataDictionary.
>
> Regards,
>
> Steve
>
>
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