Re: [Quickfixj-users] Can DataDictionary be used to create messages?

[Toli K. <to...@ma...>]

Ah, the context helps. Now it makes sense.

Looking at the DataDictionary, it seems that it doesn't actually track
msgTypeName -> msgType mappings. But it can be easily done in the
DataDictionary.addValueName() function

You should file an RFE: http://www.quickfixj.org/jira/, including your
use case.

It's pretty easy to implement, but i'd defer to Steve Bate to make a
decision on whether or not and how to implement this, or to perhaps
suggest an alternative work flow.

On 3/28/07, Naresh Bhatia <NB...@sa...> wrote:
> QuickFIX/J Documentation: http://www.quickfixj.org/documentation/
> QuickFIX/J Support: http://www.quickfixj.org/support/
> Maybe I need to give some more context. The requirement I have is to be
> able to change the message metadata dynamically. For example, if a
> custom field tag value is wrong in a running system, then I should be
> able to correct it without bouncing the system. Hence message creation
> and parsing should be completely metadata driven (no hard coding is
> allowed in code). I think message parsing can be completely driven by
> the DataDictionary, but I am not sure if message creation can be driven
> by the same metadata, especially due to issue #1. What I need is a
> simple method on the DataDictionary that returns a msgType given the
> message name. For example,
>
>     String getMsgType(String msgName);
>
>     Thus dd.getMsgType("NewOrderSingle") will return "D".
>
> I think the DataDictionary has this information, I just don't see a
> method to get it out of there.
>
> Naresh
>
> -----Original Message-----
> From: qui...@li...
> [mailto:qui...@li...] On Behalf Of Toli
> Kuznets
> Sent: Wednesday, March 28, 2007 8:47 PM
> To: qui...@li...
> Subject: Re: [Quickfixj-users] Can DataDictionary be used to create
> messages?
>
> QuickFIX/J Documentation: http://www.quickfixj.org/documentation/
> QuickFIX/J Support: http://www.quickfixj.org/support/
> Naresh,
>
> Maybe i'm not understanding what you ultimately want to do.
>
> > 1) Given a message name (e.g. "NewOrderSingle"), how can I get the
> msgType
> > (e.g. "D") using the DataDictionary? I do not readily see an method to
> do
> > this.
> The usual pattern is to use a MessageFactory to create a message:
> factory.create(MsgType.ORDER_SINGLE)
>
> > 2) Is it safe to create fields using code like new ClOrdID("321")? I
> see
> > that the constructor of ClOrdID hard codes the field tag to "11". Are
> these
> > tags values same across all FIX versions? I am thinking of this
> alternate
> > approach to pick up the tag value from the data dictionary - does it
> make
> > sense or is it needlessly complicated?
>
> The ClOrdID.FIELD value is the same across all FIX versions. the
> quickfix.field.xxx objects are auto-generated from the FIX4x.xml data
> dictionary files so the values should be constant.
>
> >     new StringField(dd.getFieldTag("ClOrdID"), "321")
>
> so this may be better written as: new ClOrdID("321") or new
> StringField(ClOrdID.FIELD, "321") if you don't want to be specific.
>
> If you are adding your own custom fields to the FIX4x.xml file, then
> go ahead and create the objects for them - that's what we did, you can
> see the example at
> http://trac.marketcetera.org/trac.fcgi/browser/platform/trunk/core/src/m
> ain/java/org/marketcetera/quickfix/customfields/NoMarketDataSnapshots.ja
> va
>
> hope this helps.
>
> --
> Toli Kuznets
> http://www.marketcetera.com: Open-Source Trading Platform
> download.run.trade.
>
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-- 
Toli Kuznets
http://www.marketcetera.com: Open-Source Trading Platform
download.run.trade.