Cheers Sergey,
I mentioned the other day I had a hunch it was in that line :-) I was
literally just about to sit down and take a look at it so I'm glad that
I opened my mail when I did.
Thanks for getting there first, I'll can put my feet up now :-)
Couple of comments inline below....
Frase
On 08/02/13 10:48, Zhemzhitsky Sergey wrote:
TypeError: stats.get(...) is undefined
while ((stats.get(i)[TIMESTAMP] < minimumTimestamp) && (i < limit)) i++;
I've debugged a little bit and found the following:
1. msgDepth stats is not a rate stats
var isRate = (description == "msgDepth") ? false : true
Yup that's exactly right, msgDepth is the only statistic being graphed
that isn't a rate - I figured that as things like msgTotalEnqueues etc.
are all absolute monotonically increasing values then it was more useful
to graph the rate.
Unfortunately it's a surprising pain in the butt to do that. When I
started I got some weird results then realised that when I add queues
etc. I was getting statistic updates in rapid succession, which was
(when I thought about it) causing much higher instantaneous rate values.
The while loop where the error is is trying to ensure that the time
delta used is (roughly) 10 seconds.
2. Next limit=size for a not rate stats
var limit = isRate ? size - 1 : size
3. Then if we look at
while ((stats.get(i)[TIMESTAMP] < minimumTimestamp) && (i < limit)) i++;
the first part of the while loop condition will be executed twice (i=0, i=1)
for limit=size=1 and i=0
so, for i=1 and size=1, stats.get(i) is undefined
What we have to do is to reorder the while loop conditions and everything will
be fine, i.e.
while ((i < limit) && (stats.get(i)[TIMESTAMP] < minimumTimestamp)) i++;
Well spotted! Good old short circuit boolean evaluation, our friend once
again.....
To be honest I'm really surprised that I haven't hit this more often
myself, as I say I almost never see this problem kicking in, so I'd
forgotten about it.
Between you and Bruno Matos you're really piling up my "null pointer"
shame this week :-[
Nice one!
Cheers,
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