quickfix-developers

[Quickfix-developers] Requesting Previous Messages

[Karl S. <ka...@gm...>]

I am trying to use the store attached to a particular session in order to
request historical messages by the sequence number. I am running the C#
wrapper to quickfix and am requesting the previous message with the
following code:

int seqNum = (int)lvFixMessages.SelectedItems[0].Tag;
ArrayList msgList = new ArrayList();
FixApplication.Session.getStore().get(seqNum, seqNum, msgList);
if(msgList.Count > 0)
{
    QuickFix.Message msg = new Message((string)msgList[0]);
}

I may be running into a multi-threaded issue here, as this is called from
the user interface thread, but I was hoping that read operations were
threadsafe.

The problem is characterisitic of multi-threading issues, sometimes it works
just fine. Other times I get an AccessViolationException "Attempted to read
or write protected memory. This is often an indication that other memory is
corrupt."

Or sometimes I also get "Runtime Error! R6025 - pure virtual function call"

Please let me know if there is a threadsafe way to access the filestore. I
am using a filestore and a single initiator, with a standard Application.

Thanks,

-Karl

Re: [Quickfix-developers] Re questing Previous Messages

[Alexis M. <ale...@ya...>]

Karl,
(and anybody else who's listening!)

Have you managed to figure this one out?

I'm having the same issue when accessing the MessageStore from within a call
to fromAdmin().

When I receive a message in fromAdmin(), I look at the MsgType and if it's a
SessionReject (3), I'm attempting to look up the original message so I can
perform further processing on it (e.g. if it was a new order message, create
an order rejected and send back to the OMS etc).

This is throwing a "Runtime Error! R6025 - pure virtual function call"
without fail! However it appears that my MessageStore.get() call returned
successfully - it seems the error happens asynchronously to my calling that
method.

I'm also using the C# wrapper, with a ThreadedSocketInitiator handling
multiple sessions.

Thanks!
Alexis



Karl Schulze-3 wrote:
> 
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
> 
> 
> I am trying to use the store attached to a particular session in order to
> request historical messages by the sequence number. I am running the C#
> wrapper to quickfix and am requesting the previous message with the
> following code:
> 
> int seqNum = (int)lvFixMessages.SelectedItems[0].Tag;
> ArrayList msgList = new ArrayList();
> FixApplication.Session.getStore().get(seqNum, seqNum, msgList);
> if(msgList.Count > 0)
> {
>     QuickFix.Message msg = new Message((string)msgList[0]);
> }
> 
> I may be running into a multi-threaded issue here, as this is called from
> the user interface thread, but I was hoping that read operations were
> threadsafe.
> 
> The problem is characterisitic of multi-threading issues, sometimes it
> works
> just fine. Other times I get an AccessViolationException "Attempted to
> read
> or write protected memory. This is often an indication that other memory
> is
> corrupt."
> 
> Or sometimes I also get "Runtime Error! R6025 - pure virtual function
> call"
> 
> Please let me know if there is a threadsafe way to access the filestore. I
> am using a filestore and a single initiator, with a standard Application.
> 
> Thanks,
> 
> -Karl
> 
> -------------------------------------------------------------------------
> Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
> Studies have shown that voting for your favorite open source project,
> along with a healthy diet, reduces your potential for chronic lameness
> and boredom. Vote Now at http://www.sourceforge.net/community/cca08
> _______________________________________________
> Quickfix-developers mailing list
> Qui...@li...
> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
> 

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Re: [Quickfix-developers] Re questing Previous Messages

[Patrick W. <pw...@ka...>]

I don't have your exact error but I remember there was a problem holding a reference to the message store.

This is my code similar to yours:
var list = new ArrayList();
_messageStore.refresh();
_messageStore.get(seqNum.getValue(), seqNum.getValue() + 1, list);
if (list.Count == 1)
{
    try
    {
        var refMessage = new Message((string) (list[0]));
        if (refMessage is NewOrderSingle)
        ....

Where _messageStore is a class variable:
protected MessageStore _messageStore;

What I found was that this object would now be disposed twice when the class was destroyed so I had to put in this code:
        public virtual void Shutdown()
        {
            //Must call this or else messagestore is double-deleted in cpp
            if (_messageStore != null)
            {
                GC.SuppressFinalize(_messageStore);
                _messageStore = null;
            }
        }


Like I said, not exactly the same as your problem but maybe a bit similar.

Maybe you could try suppress finalize on your temp message store variable??

Patrick


-----Original Message-----
From: qui...@li... [mailto:qui...@li...] On Behalf Of Alexis Michaelides
Sent: Friday, 15 August 2008 10:33 AM
To: qui...@li...
Subject: Re: [Quickfix-developers] Re questing Previous Messages

QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
QuickFIX Support: http://www.quickfixengine.org/services.html


Karl,
(and anybody else who's listening!)

Have you managed to figure this one out?

I'm having the same issue when accessing the MessageStore from within a call
to fromAdmin().

When I receive a message in fromAdmin(), I look at the MsgType and if it's a
SessionReject (3), I'm attempting to look up the original message so I can
perform further processing on it (e.g. if it was a new order message, create
an order rejected and send back to the OMS etc).

This is throwing a "Runtime Error! R6025 - pure virtual function call"
without fail! However it appears that my MessageStore.get() call returned
successfully - it seems the error happens asynchronously to my calling that
method.

I'm also using the C# wrapper, with a ThreadedSocketInitiator handling
multiple sessions.

Thanks!
Alexis



Karl Schulze-3 wrote:
>
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
>
> I am trying to use the store attached to a particular session in order to
> request historical messages by the sequence number. I am running the C#
> wrapper to quickfix and am requesting the previous message with the
> following code:
>
> int seqNum = (int)lvFixMessages.SelectedItems[0].Tag;
> ArrayList msgList = new ArrayList();
> FixApplication.Session.getStore().get(seqNum, seqNum, msgList);
> if(msgList.Count > 0)
> {
>     QuickFix.Message msg = new Message((string)msgList[0]);
> }
>
> I may be running into a multi-threaded issue here, as this is called from
> the user interface thread, but I was hoping that read operations were
> threadsafe.
>
> The problem is characterisitic of multi-threading issues, sometimes it
> works
> just fine. Other times I get an AccessViolationException "Attempted to
> read
> or write protected memory. This is often an indication that other memory
> is
> corrupt."
>
> Or sometimes I also get "Runtime Error! R6025 - pure virtual function
> call"
>
> Please let me know if there is a threadsafe way to access the filestore. I
> am using a filestore and a single initiator, with a standard Application.
>
> Thanks,
>
> -Karl
>
> -------------------------------------------------------------------------
> Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
> Studies have shown that voting for your favorite open source project,
> along with a healthy diet, reduces your potential for chronic lameness
> and boredom. Vote Now at http://www.sourceforge.net/community/cca08
> _______________________________________________
> Quickfix-developers mailing list
> Qui...@li...
> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
>

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Re: [Quickfix-developers] Re questing Previous Messages

[Alexis M. <ale...@ya...>]

Patrick,

Doing a SuppressFinalize on my temp store did the trick, thanks! I still
need to do some more extensive testing, but everything's looking much
healthier now.

Thanks,
Alexis





Patrick Wright-3 wrote:
> 
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
> 
> I don't have your exact error but I remember there was a problem holding a
> reference to the message store.
> 
> This is my code similar to yours:
> var list = new ArrayList();
> _messageStore.refresh();
> _messageStore.get(seqNum.getValue(), seqNum.getValue() + 1, list);
> if (list.Count == 1)
> {
>     try
>     {
>         var refMessage = new Message((string) (list[0]));
>         if (refMessage is NewOrderSingle)
>         ....
> 
> Where _messageStore is a class variable:
> protected MessageStore _messageStore;
> 
> What I found was that this object would now be disposed twice when the
> class was destroyed so I had to put in this code:
>         public virtual void Shutdown()
>         {
>             //Must call this or else messagestore is double-deleted in cpp
>             if (_messageStore != null)
>             {
>                 GC.SuppressFinalize(_messageStore);
>                 _messageStore = null;
>             }
>         }
> 
> 
> Like I said, not exactly the same as your problem but maybe a bit similar.
> 
> Maybe you could try suppress finalize on your temp message store
> variable??
> 
> Patrick
> 
> 
> -----Original Message-----
> From: qui...@li...
> [mailto:qui...@li...] On Behalf Of
> Alexis Michaelides
> Sent: Friday, 15 August 2008 10:33 AM
> To: qui...@li...
> Subject: Re: [Quickfix-developers] Re questing Previous Messages
> 
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
> 
> 
> Karl,
> (and anybody else who's listening!)
> 
> Have you managed to figure this one out?
> 
> I'm having the same issue when accessing the MessageStore from within a
> call
> to fromAdmin().
> 
> When I receive a message in fromAdmin(), I look at the MsgType and if it's
> a
> SessionReject (3), I'm attempting to look up the original message so I can
> perform further processing on it (e.g. if it was a new order message,
> create
> an order rejected and send back to the OMS etc).
> 
> This is throwing a "Runtime Error! R6025 - pure virtual function call"
> without fail! However it appears that my MessageStore.get() call returned
> successfully - it seems the error happens asynchronously to my calling
> that
> method.
> 
> I'm also using the C# wrapper, with a ThreadedSocketInitiator handling
> multiple sessions.
> 
> Thanks!
> Alexis
> 
> 
> 
> Karl Schulze-3 wrote:
>>
>> QuickFIX Documentation:
>> http://www.quickfixengine.org/quickfix/doc/html/index.html
>> QuickFIX Support: http://www.quickfixengine.org/services.html
>>
>>
>> I am trying to use the store attached to a particular session in order to
>> request historical messages by the sequence number. I am running the C#
>> wrapper to quickfix and am requesting the previous message with the
>> following code:
>>
>> int seqNum = (int)lvFixMessages.SelectedItems[0].Tag;
>> ArrayList msgList = new ArrayList();
>> FixApplication.Session.getStore().get(seqNum, seqNum, msgList);
>> if(msgList.Count > 0)
>> {
>>     QuickFix.Message msg = new Message((string)msgList[0]);
>> }
>>
>> I may be running into a multi-threaded issue here, as this is called from
>> the user interface thread, but I was hoping that read operations were
>> threadsafe.
>>
>> The problem is characterisitic of multi-threading issues, sometimes it
>> works
>> just fine. Other times I get an AccessViolationException "Attempted to
>> read
>> or write protected memory. This is often an indication that other memory
>> is
>> corrupt."
>>
>> Or sometimes I also get "Runtime Error! R6025 - pure virtual function
>> call"
>>
>> Please let me know if there is a threadsafe way to access the filestore.
>> I
>> am using a filestore and a single initiator, with a standard Application.
>>
>> Thanks,
>>
>> -Karl
>>
>> -------------------------------------------------------------------------
>> Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
>> Studies have shown that voting for your favorite open source project,
>> along with a healthy diet, reduces your potential for chronic lameness
>> and boredom. Vote Now at http://www.sourceforge.net/community/cca08
>> _______________________________________________
>> Quickfix-developers mailing list
>> Qui...@li...
>> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
>>
> 
> --
> View this message in context:
> http://www.nabble.com/Requesting-Previous-Messages-tp18316609p18991978.html
> Sent from the QuickFIX - Dev mailing list archive at Nabble.com.
> 
> 
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the
> world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Quickfix-developers mailing list
> Qui...@li...
> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
> 
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the
> world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Quickfix-developers mailing list
> Qui...@li...
> https://lists.sourceforge.net/lists/listinfo/quickfix-developers
> 
> 

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