Re: [Quickfix-developers] .Net: Cloning QuickFix.Message
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Re: [Quickfix-developers] .Net: Cloning QuickFix.Message
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From: Kotecha, R. <Rav...@st...> - 2009-09-30 09:59:11
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Hi Regis, Have you tried the slightly more 'dirty' approach of setString? Instead of: NewOrderSingle order = new NewOrderSingle(message.ToString()); Try: NewOrderSingle order = new NewOrderSingle(); order.setString(message.ToString()); I've used something similar in the past when our QF engine would dump messages in a raw format straight into a database for processing later. Regards, Ravi Kotecha -----Original Message----- From: reg...@ho... [mailto:reg...@ho...] Sent: 29 September 2009 19:41 To: qui...@li... Subject: Re: [Quickfix-developers] .Net: Cloning QuickFix.Message QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html QuickFIX Support: http://www.quickfixengine.org/services.html Note that, the reason why I need to clone the message (which I would avoid to do as it's CPU consuming), is because it seems that when one tries to deal with the QuickFix message received directly from fromApp() or ToApp() asynchronoulsy the following problem arises: public void FromApp(Message message) { DoSomthingAsynchronously(message); crack(message); } will result in the asynchronous method to handle a message that can be "replaced" by the syncronous QuickFIX thread before it has a chance to be handled. e.g: -> Receive MSG1 -> Enqueue MSG1 for async processing -> Receive MSG2 -> Process MSG1 asyncronously -> It is now pointing to MSG2! This is probably due to a C++ memory handling approach but complicates things when used through the .Net Wrapper. Hope I make sense. Regis. On Tue, 29 Sep 2009 11:21:10 -0700 (PDT), Brian Erst <azz...@ya...> wrote: > It looks like it's because you're instantiating a base class (Message) and > trying to cast it to a derived class (NewOrderSingle). > > As far as I can tell, Message doesn't define a clone method, so you'd > probably have to figure out the message type first, then use the copy > constructor for the derived class, e.g. > > Message newMsg; > if (msg instanceof NewOrderSingle) > { > newMsg = new NewOrderSingle(msg); // NewOrderSingle's copy > constructor for NOS and Message are identical > } ... etc... > > Obviously, if you had a bunch of different messages you wanted to clone, > you'd be better off building a switch statement off the MsgType of the > message. > > - Brian Erst > Thynk Software, Inc. > > > > > ________________________________ > From: "reg...@ho..." <reg...@ho...> > To: qui...@li... > Sent: Tuesday, September 29, 2009 11:46:48 AM > Subject: [Quickfix-developers] .Net: Cloning QuickFix.Message > > QuickFIX Documentation: > http://www.quickfixengine.org/quickfix/doc/html/index.html > QuickFIX Support: http://www.quickfixengine.org/services.html > > > Hi, > > I'd like to clone FIX Messages. I have tried > fromApp(Message msg) > { > Message newMsg = new Message(msg.ToString); > } > > which seems to work fine. > Unfortunately it is thenimpossible to cast newMsg in any FIX subtypes! > e.g > > NewOrderSingle order = newMsg as NewOrderSingle; > > does not work anymore. (even though newMsg is indeed a NewOrderSingle > 35=D) > > Any idea why? > > Thanks, > > Regis > > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry® Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9-12, 2009. Register now! > http://p.sf.net/sfu/devconf > _______________________________________________ > Quickfix-developers mailing list > Qui...@li... > https://lists.sourceforge.net/lists/listinfo/quickfix-developers ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. 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