Comment Feed for Channel 9 - Rx Workshop: Event Processing

Re: Rx Workshop: Event Processing

javelinBCD — Thu, 30 Jun 2011 15:25:13 GMT

This should be a great series. Finally a reason I can push more people at work to learn Linq.

I attended SoCal Code Camp in San Diego last weekend. There was a session on real world Rx and Rx Koans. This gave me a great start on Rx. The Koans looks like a great way to help learn Rx. just wanted everyone to know about this codeplex project. The idea of using koans come from the Ruby community and are an effective way to learn.

"Koans - Zen Buddhist riddle: a Zen Buddhist riddle used to focus the mind during meditation and to develop intuitive thinking"

posted by javelinBCD

Re: Rx Workshop: Event Processing

AbdouMoumen — Thu, 30 Jun 2011 18:51:54 GMT

Hey,

This is the second video (after the introduction video) of the series, right? but I get the feeling that you're talking about things that I haven't seen in the first video (like when you said "if you did the last challenge you'll know where did that 'stock ticks' come from".) Maybe there's a problem with the ordering of the episodes.

Thanks for the great series anyway

posted by AbdouMoumen

Re: Rx Workshop: Event Processing

Charles — Thu, 30 Jun 2011 19:51:27 GMT

@AbdouMoumen: This is actually the 3rd part.

posted by Charles

Re: Rx Workshop: Event Processing

AbdouMoumen — Fri, 01 Jul 2011 00:04:06 GMT

@Charles:OK, thanks. The ordering of the videos in the series' page is a little confusing what's even more confusing is that near the end of the video, when opening the solution for the challenge, the folder says "Challenge 5: Complex Event Processing"

posted by AbdouMoumen

Re: Rx Workshop: Event Processing

Charles — Fri, 01 Jul 2011 01:16:09 GMT

@AbdouMoumen: Yeah, we messed this up It's the right challenge, though. I'll circle back with Wes and Bart to ensure we have this all right...

posted by Charles

Re: Rx Workshop: Event Processing

Moumen — Fri, 01 Jul 2011 14:49:53 GMT

@Charles:OK, I've already downloaded the whole series though, so, I'll try to figure it out

posted by Moumen

Re: Rx Workshop: Event Processing

cbae — Sat, 02 Jul 2011 02:32:11 GMT

1 day ago,Charles wrote
@AbdouMoumen: This is actually the 3rd part.

I went through all the videos, and it this one appears to be the last one. So skip to the 3rd one in the list of videos, and come back to this one at the end.

posted by cbae

Re: Rx Workshop: Event Processing

Moumen — Sat, 02 Jul 2011 10:02:17 GMT

I just noticed that the Challenge files have the correct numbers (so this is actually the 5th episode) stick to them and you'll be fine

By the way, aren't there two more episodes? ( "Reactive Coincidence" and "Programming the Cloud")

posted by Moumen

Re: Rx Workshop: Event Processing

mdcsoft — Wed, 06 Jul 2011 23:40:38 GMT

I think I got it!

Code Snippet

var result = quotes
.Where(q=>q.Symbol=="MSFT")
.Select(q=> new {q.Close, q.Date, q.High, q.Low})
.Buffer(5)
.Select(list => new
{
AvgHigh=list.Average(q=>q.High),
AvgLow=list.Average(q=>q.Low),
Last=list.Last().Close,
Date=list.Last().Date
});

posted by mdcsoft

Re: Rx Workshop: Event Processing

Yazid — Wed, 13 Jul 2011 10:00:45 GMT

Great video, where can I download the code (Chanlleng)
TIA
Yaz

posted by Yazid

Re: Rx Workshop: Event Processing

Reonekot — Mon, 08 Aug 2011 11:54:22 GMT

All links to the challenges are giving 404 error. Could someone fix it please?

posted by Reonekot

Re: Rx Workshop: Event Processing

Eugene Strizhok — Sat, 03 Sep 2011 08:05:05 GMT

This, I believe, the answer for same task, but taking non-stocking days into account.

return from window in
(from quote in quotes
group quote by quote.Symbol
into company
from window in company.Buffer(2, 1)
from stock in this.WithNonStockingDays(window)
where stock.Symbol == "MSFT"
select stock).Buffer(5, 4)
select new {
window.Last().Date,
window.Last().Close,
AverageHigh = window.Average(q => q.High),
AverageLow = window.Average(q => q.Low)
};

private IEnumerable<StockQuote> WithNonStockingDays(IList<StockQuote> window) {
var left = window.First();
var right = window.Last();

yield return left;
while (right.Date - left.Date > TimeSpan.FromDays(1)) {
left = new StockQuote {
Close = left.Close,
Date = left.Date.AddDays(1),
High = left.High,
Low = left.Low,
Open = left.Open,
Symbol = left.Symbol,
Volume = left.Volume
};
yield return left;
}
yield return right;
}

posted by Eugene Strizhok

Re: Rx Workshop: Event Processing

Eugene Strizhok — Sat, 03 Sep 2011 08:06:03 GMT

But how do I insert code snippets?

posted by Eugene Strizhok