Comments on: Step 8 – The LMSSetValue() Function http://www.vsscorm.net/2009/06/14/the-lmssetvalue-function/ A Very Simple SCORM Interface Tue, 27 Jul 2010 13:37:25 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Steve Addison http://www.vsscorm.net/2009/06/14/the-lmssetvalue-function/comment-page-1/#comment-31 Steve Addison Wed, 18 Nov 2009 01:16:05 +0000 http://www.vsscorm.net/?p=224#comment-31 Hi Joe I have seen performance problems as <a href="/2009/11/17/step-43-the-need-for-speed/" rel="nofollow">Step 43 - The Need for Speed</a> (posted today - Tuesday, November 17th, 2009) discusses. But they were (I believe) to do with the course's use of LMSetValue and LMSGetValue causing excessive numbers of AJAX requests. I did try the 'asynchronous' option early in my investigations, but ran into problems. It seems that courses (SCOs) often use an LMSSetValue() to set a data element value, and then immediately use an LMSGetValue() to read it back into the course in order to make sure that it was transferred correctly. From what I could make out, using 'asynchronous' could result in LMSGetValue() being executed <strong>before</strong> the LMSSetValue(). In this case, the course sees it as an error in transferring the data. So, in summary, I don't think you can use the 'asynchronous' mode without the risk of confusing the course. Hopefully, the caching system that I'm working on right now will make this problem irrelevant. Steve Hi Joe

I have seen performance problems as Step 43 – The Need for Speed (posted today – Tuesday, November 17th, 2009) discusses. But they were (I believe) to do with the course’s use of LMSetValue and LMSGetValue causing excessive numbers of AJAX requests.

I did try the ‘asynchronous’ option early in my investigations, but ran into problems. It seems that courses (SCOs) often use an LMSSetValue() to set a data element value, and then immediately use an LMSGetValue() to read it back into the course in order to make sure that it was transferred correctly. From what I could make out, using ‘asynchronous’ could result in LMSGetValue() being executed before the LMSSetValue(). In this case, the course sees it as an error in transferring the data.

So, in summary, I don’t think you can use the ‘asynchronous’ mode without the risk of confusing the course. Hopefully, the caching system that I’m working on right now will make this problem irrelevant.

Steve

]]> By: Joe http://www.vsscorm.net/2009/06/14/the-lmssetvalue-function/comment-page-1/#comment-30 Joe Tue, 17 Nov 2009 20:17:45 +0000 http://www.vsscorm.net/?p=224#comment-30 First of all..excellent tutorial! Have you ever experienced any performance issues as a result of the third parameter (asynchronous/synchronous, true/false) being set to false (synchronous). I understand that in the GET call, we need to wait on the return, but it seems as if we can set it to asynchronous on the SET call. Make sense? -Joe First of all..excellent tutorial!
Have you ever experienced any performance issues as a result of the third parameter (asynchronous/synchronous, true/false) being set to false (synchronous).
I understand that in the GET call, we need to wait on the return, but it seems as if we can set it to asynchronous on the SET call. Make sense?
-Joe

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