Re: [Quickfixj-users] Generate FIX string with tags in a specific order?

[dmd <dm...@co...>]

Thanks very much Steve!

It seems like subclassing the Group and defining the custom ordering will be
the best solution in our case.

Cheers,
Dan



Steve Bate wrote:
> 
> QuickFIX/J Documentation: http://www.quickfixj.org/documentation/
> QuickFIX/J Support: http://www.quickfixj.org/support/
> 
> 
> Hi Dan,
> 
> Based on what you've said, it sounds nonstandard. The FIX
> specification does specify the order of repeating group fields
> but not the non-group message fields.
> 
> Which exchange is requiring this behavior?
> 
> I assume you are building your message using the generated
> group subclasses. Is that right? If so, you could instead create
> a Group object with the required nonstandard first/delimeter
> field and the required field order for the remaining group
> fields.
> 
> For example, the Header.NoHops group class is defined as ...
> 
>   public static class NoHops extends Group {
>     public NoHops() {
>         super(627, 628,
>             new int[] {628, 629, 630,  0 } );
>     }
> 
>     ...
>   }
> 
> The first constructor argument is the count tag, the 
> second argument is the delimeter/first field tag and the third 
> argument is the group field ordering.
> 
> If you need field 629 to be the first group field you
> could use a generic Group like ...
> 
>    new Group(627, 629, new int[] { 629, 628, 630, 0 });
> 
> This group could be created using data from a data dictionary.
> You could also create a custom subclass with the modified 
> constructor.
> 
>   public class NonstandardNoHops extends Group {
>     public NoHops() {
>         super(627, 629,
>             new int[] {629, 628, 630,  0 } );
>     }
> 
>     ...
>   }
> 
> Another option is to modify the data dictionary XML and
> regenerate the classes for the nonstandard exchange. (This might
> require running the engine for that exchange in it's own
> JVM to avoid problems with differing message classes.)
> 
> There are lots of options. As you mentioned, we could also
> format group-related fields using a data dictionary but
> this will be somewhat slower than the current approach. 
> 
> Regards,
> 
> Steve
> 
>> -----Original Message-----
>> From: qui...@li... 
>> [mailto:qui...@li...] On 
>> Behalf Of dmd
>> Sent: Thursday, January 31, 2008 9:37 PM
>> To: qui...@li...
>> Subject: Re: [Quickfixj-users] Generate FIX string with tags 
>> in a specific order?
>> 
>> QuickFIX/J Documentation: http://www.quickfixj.org/documentation/
>> QuickFIX/J Support: http://www.quickfixj.org/support/
>> 
>> 
>> 
>> This solution will work, but it seems rather inefficient, 
>> especially for latency sensitive applications, like ours for 
>> instance.  Will this issue be 'fixed' at some point?
>> 
>> Actually, does the FIX spec mandate that tags be in a 
>> particular order?  Or is it just according to the 
>> dictionary's definition?  In other words, is the particular 
>> aforementioned exchange doing something non-standard?
>> 
>> Cheers,
>> Dan
>> 
>> 
>> 
>> toli wrote:
>> > 
>> > QuickFIX/J Documentation: http://www.quickfixj.org/documentation/
>> > QuickFIX/J Support: http://www.quickfixj.org/support/ David,
>> > 
>> >> I was hoping for something that let me do (in effect)
>> >> msg.toString(Dictionary)
>> > 
>> > There actually is a quickfix.Message call you can use:
>> >     public void fromString(String messageData, DataDictionary dd, 
>> > boolean doValidation)
>> > 
>> > Will that work of you? you can create one message the 
>> "regular way", 
>> > then to a toString() on it and use the string-based FIX messgae to 
>> > re-create it using a custom dictionary.
>> > 
>> > Perhaps that may work for you?
>> > 
>> > --
>> > Toli Kuznets
>> > http://www.marketcetera.com: Open-Source Trading Platform 
>> > download.run.trade.
>> > 
>> > 
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>> > Qui...@li...
>> > https://lists.sourceforge.net/lists/listinfo/quickfixj-users
>> > 
>> > 
>> 
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