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»Forums Index »Archive (2017 and earlier) »IQFeed Developer Support »[COM]: Daily and intraday history requests from separate threads
Author Topic: [COM]: Daily and intraday history requests from separate threads (6 messages, Page 1 of 1)

dis
-Interested User-
Posts: 24
Joined: Apr 16, 2007


Posted: Jun 8, 2007 09:02 AM          Msg. 1 of 6
Is it possible to do 2 historical requests (daily and intraday) from separate threads at the same time? Can the data be corrupted in such situation?

DTN_Steve_S
-DTN Guru-
Posts: 2093
Joined: Nov 21, 2005


Posted: Jun 8, 2007 09:08 AM          Msg. 2 of 6
This is 100% possible. I know that several of our developers use the COM requests in this way. There should not be any chance of data corruption.

dis
-Interested User-
Posts: 24
Joined: Apr 16, 2007


Posted: Jun 8, 2007 09:37 AM          Msg. 3 of 6
But... If OnAbortedLoad event would be raised, how I could determinate which request failed?

DTN_Steve_S
-DTN Guru-
Posts: 2093
Joined: Nov 21, 2005


Posted: Jun 8, 2007 09:45 AM          Msg. 4 of 6
Since you would be using multiple threads, each request (and response) should be completely isolated from each other request. As a result, you would determine this the same way you do now with a single request.

simon33
-Interested User-
Posts: 28
Joined: Apr 9, 2005


Posted: Jun 11, 2007 10:39 PM          Msg. 5 of 6
However, this is not possible via TCP/IP correct? I have attempted this and it appears to handle them sequentially (I use java and connect via sockets). Does that match the information that you have?

I ask because even though it seems to be sequential handling of requests (I turned on DTN logs and that is what I see) we did have a situation in our logs that seems to indicate otherwise.

DTN_Steve_S
-DTN Guru-
Posts: 2093
Joined: Nov 21, 2005


Posted: Jun 12, 2007 09:25 AM          Msg. 6 of 6
TCP/IP handles it the same way as COM.

If you make simultaneous connections, they will get executed simultaneously.

Depending upon exactly how you are making your requests, the logs may not be a very good indicator of what is acutally happening. This is a design flaw of the logging implementation in IQConnect.

If you open 2 separate socket connections to IQConnect and make simultaneous requests, you will get data returned on both sockets simultaneously.

If you open a single socket and make 2 separate requests at the same time, they will be executed sequentially.
 

 

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