Re: [Quickfix-users] Creating a correctly typed message from a string

[abaraff <ab...@ra...>]

The answer to the question is to use the MessageUtils.parse method:

quickfix.Message newMessage = MessageUtils.parse(_messageFactory,
Session.lookupSession(sessionID).getDataDictionary(), persistedString); 


abaraff wrote:
> 
> I'm building an application that in the event of a crash or restart can
> reestablish state based on reprocessing messages that it has previously
> received.  During normal operation messages that arrive are cracked in the
> fromApp callback.  I'd like to be able to use the crack method of the
> MessageCracker to reprocess my persisted messages.  Unfortunately, it
> appears as though the MessageCracker expects to receive a properly typed
> message, and I can't figure out how to construct a properly typed message
> from a string or from key-value pairs without completely reinventing the
> wheel.
> 
> If I construct a quickfix.Message object like this:
> quickfix.Message newMessage = new quickfix.Message(persistedString, true);
> 
> crack(newMessage, sessionID); will throw an exception stating that:
> "java.lang.ClassCastException: quickfix.Message cannot be cast to
> quickfix.fix42.Message"
> 
> If I construct a quickfix.fix42.Message object like this :
> quickfix.Message msg = new quickfix.Message(persistedString, true);
> quickfix.fix42.Message newMessage = new quickfix.fix42.Message();
> Iterator fieldIterator = msg.getHeader().iterator();
> while(fieldIterator.hasNext())
> {
>     Field fld = (Field) fieldIterator.next();
>     newMessage.getHeader().setString(fld.getField(),
> fld.getObject().toString());
> }fieldIterator = msg.iterator();
> while(fieldIterator.hasNext())
> {
>     Field fld = (Field) fieldIterator.next();
>     newMessage.setString(fld.getField(), fld.getObject().toString());
> }
> 
> crack(msg, sessionID); will throw this exception
> "java.lang.ClassCastException: quickfix.fix42.Message cannot be cast to
> quickfix.fix42.NewOrderSingle"
> 
> Obviously, the API is converting a string into a properly typed Message
> somewhere.  Is this machinery accessible?  I could certainly do away with
> the cracker or build my own typed message constructor (which would
> constitute rewriting a huge chunk of QuickFIX/J) or build some sort of
> hacked switch statement.
> 
> Thanks,
> 
> Anthony
> 
> (Message also posted to QuickFIX/J)
> 

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