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[Mod-pubsub-general] RE: javascript trick redux
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From: Adam R. <Ad...@Kn...> - 2003-05-11 00:23:22
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Hi Dave, I will let Lucas answer as to whether he cares to share his .NET server. The problem with .NET/IIS closing connections is similar to the problem = Java application servers cause, too, in the name of scalability. = They're built to close connections as quickly as they can so they can = vend new incoming requests with greater quality of service. What you're doing at http://www.bangeye.com/pubsub/ is certainly similar = to what we're doing. Nicely done! Ka-Ping Yee demonstrated this technique using animated gifs almost four = years ago: http://zesty.ca/chat.html but when I go to that site today, it doesn't quite work. Other similar projects are: Pushlets - http://sourceforge.net/projects/pushlets/ http://www.pushlets.com/ OpenThought - http://sourceforge.net/projects/openthought/ http://www.openthought.net/ I'm Cc'ing Just and Eric on this note just to give them a heads-up and = thank them for teaching the world about HTTP streaming techniques. Adam -----Original Message----- From: dav...@on... [mailto:dav...@on...] Sent: Sat 5/10/2003 1:04 AM To: mod...@li... Cc:=09 Subject: [Mod-pubsub-developer] RE: [Mod-pubsub-general] javascript = trick redux --=20 I'd be interested in reviewing your .NET server if you'd care to share = it. I quickly whipped this out to try understand the reference to a = continuous <script> file and it appeared to work fairly well. Of course = IIS and .NET timed out which would negate the use of this combination of = server tech unless this limitation could be circumvented. But check it out - I assume this is similiar to what KN is doing... http://www.bangeye.com/pubsub/ Dave Cline dav...@on... www.bangeye.com/ 801-636-5603 -----Original Message----- From: "Adam Rifkin" <Ad...@Kn...> Sent: Fri, 9 May 2003 19:32:09 -0700 To: "Lucas Fletcher" = <lu...@de...>;<mod...@li...> Cc: <mod...@li...> Subject: [Mod-pubsub-developer] RE: [Mod-pubsub-general] javascript = trick redux Hi Lucas, Browsers buffer data read off the wire. To overcome this, try sending 4k or so of spaces after the </script> = tag. Also, we use hidden frames, not iframes. Have a look at the kn_debug part of the "Command-line Arguments" section in http://www.mod-pubsub.org/kn_docs/javascript_reference.html or use ?kn_debug in the URL like so: http://www.mod-pubsub.org/kn_apps/presence1/?kn_debug and this will reveal those hidden frames. Hope that helps, Adam -----Original Message----- From: Lucas Fletcher [mailto:lu...@de...] Sent: Thursday, May 08, 2003 10:27 PM To: mod...@li... Subject: [Mod-pubsub-general] javascript trick redux Hello, You thought you scared me away didn't you, with all your craziness and = such? Well it's not that easy I'm afraid. I've spent the last day or so writing a server in .NET framework that = keeps open a javascript file like you guys are doing. My friend who is hosting 10's of thousands of flash-based clients (yeah, that's a custom server = all righty) says that the way to do it on Windows (he is using Linux) is = with I/O completion ports. His tests scaled up to at least a few thousands = users on one box. And I guess that the asynchronous methods in the System.Net.Sockets namespace use I/O completion ports under the hood. = This uses the system thread pool for connection pooling. So I managed to = write the server with only a couple hundred lines of code. It uses a regular = IIS server for the upstream and then .NET remoting to communicate with the custom server and then back down again via the javascript request. Which brings me to a problem: the browser blocks execution on the javascript = file so the page doesn't load. Is there a special response header I need to include? I can put the <script></script> tag after the closing <body> = but I get some weird errors elsewhere on the page, and also the IE world icon keeps spinning. I noticed in the KnowNow demonstrations that this didn't = happen. Were there iframes being used? I covet its coolness. -- Lucas Fletcher lu...@de... http://dealersinnotions.com _______________________________________________ Mod-pubsub http://mod-pubsub.sf.net/ |
