Re: [Quickfix-developers] Message creation

[<gar...@su...>]

You're right on the Constructor.  I guess a constructor can't return a
derived class, can it?
But it probably belongs in MessageFactory  like you say, but I can't find
any fromString method in MessageFactory (I am using the 1.3.2
distribution).  The fromString in Message is a private native method.

Am I not looking in the right place?  For now, is it a problem for me to do
this for now as described below?

Thanks,


Gary Mui
Prescient Markets, Inc         914-989-3118  (W)
445 Hamilton Avenue          914-422-3693  (F)
White Plains, NY 10601

Please visit us at http://www.cpmarket.com


                                                                                                          
                    OMiller@though                                                                        
                    tworks.COM            To:     gar...@su...                                    
                                          cc:     qui...@li...,              
                    01/03/03 03:39        qui...@li...                 
                    PM                    Subject:     Re: [Quickfix-developers] Message creation         
                                                                                                          
                                                                                                          




>> It would be nice if the Message constructor (taking a String value)
could
>> do this automatically.  In order to this, I needed to make the
>> Message.initFromString(String str) method public instead of protected.

>> Is this a reasonable request?  Or is there an easier way to create a
>> message object?

I'm not sure how the message constructor can do this automatically.  Once
in the constructor you are already creating a message object and not one of
the derived objects you need.  Am I misunderstanding you?  Do you mean
maybe to have a create method on the MessageFactory that takes in a string?
In any case you do not need to make initFromString public as there already
is a public method called fromString.  initFromString is designed to be
called from constructors because it creates an underlying C++ class.

>> Another related question is what happens if you request a message (via
>> sequence number) from the MessageStore but it doesn't exists?  I'm going
to
>> have the client basically ask for all messages since (lastMsgRecvd + 1).

Depends on which method you use.  If you use the signature for requesting
one message, it will return false if not available.  If you use the method
for requesting a range, it will return a collection with whatever is
available.  So if you have 1-50, and ask for 30-60, you will get 30-50.