Comments on: Reverse Ajax with DWR

By: Manikandan

Manikandan — Tue, 30 Oct 2007 14:30:29 +0000

We are using ajax using DWR and calling an RMI server through our web server. But we feel the java script code and control we use are open to the workld. Does Reverse – ajax facilitate to encapsulate the Java script code in java itself or am i wrong in understanding. Is there any working model web site or litreture we can find to test the Reverse ajax concept using DWR.

By: bashar

bashar — Sat, 19 May 2007 19:16:57 +0000

DWR is cool but I expected more efficient way of using the bandwidth. I am thinking to use this technology or technique in mobile application where the bandwidth and the connection is relatively expensive. I am not even sure about the ability to keep continuous connection with the server. Anyway, I will give it a try ;)

By: Ananth Packil Durai

Ananth Packil Durai — Thu, 19 Apr 2007 10:33:41 +0000

complete example will do lot good

By: Adnan Siddiqi

Adnan Siddiqi — Tue, 27 Mar 2007 18:56:19 +0000

refershing after every x seconds might not be a good idea if application is heavy loaded and being used by several users at same time.

I wonder is it possible to make an update when a system is Idle? could it be implemented at client end?

By: Marcel Huijkman

Marcel Huijkman — Mon, 29 May 2006 09:40:11 +0000

Just my 2 cents on refreshing every x seconds:
if there is a listener stack, and Ajax web-parts could register itself to that listener, then the listener would resfresh the Ajax web-part.

Perhaps with external modifications on shared sources, the listener itslef would have to pull the server for changes, but that’s only 1 pull instead of each Ajax web-part pulling.

By: Nutz

Nutz — Fri, 26 May 2006 06:26:37 +0000

Curious to know whether Aflax/Pushlets work well with Microsoft IIS web server and ASP – anyone using this sort of setup ?

By: Just van den Broecke

Just van den Broecke — Fri, 26 May 2006 05:49:36 +0000

Sockets (other than over port 80) may not be allowed from within corparate intranets to the internet. HTTP is then the only resort. This was one of the reasons I developed Pushlets (www.pushlets.com). Pushlets can operate in 3 modes: pull, stream (comet) and poll. Note the difference between pull and poll: with pull the server holds the request until events are available or a timeout, but the request is returned and reissued (after a random configurable time). It is like fishing: wait for an event and catch. Dependent on the application a client may use either mode (or the server may force a particular mode). Through a client library (among them JavaScript with AJAX) this is transparent to the client (they just receive events). Also event routing is tackled: broadcast, multicast (topic subscription) or unicast.

By: Phill Kenoyer

Phill Kenoyer — Thu, 25 May 2006 20:37:03 +0000

Nutz – We have a closed customer base. We just tell them to open the port to our server. Currently we are using Aflax as our Flash socket client. The only problems we’ve ran into is getting our customers to install Flash 8.

By: Grant Gochnauer - Blog : Technology : Foundation » Thursday News

Grant Gochnauer - Blog : Technology : Foundation » Thursday News — Thu, 25 May 2006 12:30:40 +0000

[...] Highlight: Reverse AJAX with DWR [...]

By: Dan

Dan — Thu, 25 May 2006 12:03:50 +0000

The sky is falling …
I heard socket and Flash in the same sentence. I know a lot of Flash “programmers”, and I don’t want them connecting to my computer. They have a tendancy to be less than through. I’m going to modify my Flash settings now … maybe stick up an extra firewall or two.

By: Michael Mahemoff

Michael Mahemoff — Thu, 25 May 2006 08:25:12 +0000

Sockets would be good as a further types of implementation for DWR. (One in Flash, another Java).

By: Nutz

Nutz — Thu, 25 May 2006 08:16:02 +0000

Arnoud/Phill – how are you getting around firewall issues when using Flash sockets ? Are you connecting back to server on port 443 – which would normally be open ?

By: Arnoud

Arnoud — Thu, 25 May 2006 05:36:06 +0000

Totally agree with Phill, sockets which flash (esp. Flash 8) is easy, efficient and very fast. I'm not sure how this would scale, but luckely my apps will not attract many people :-) I use it in combination with Backbase and can send bxml from the server to the browser. At any time I can influence any browser that is open, move elements, execute javascript, popup layers, change text, etc.

By: Hubris Sonic

Hubris Sonic — Thu, 25 May 2006 04:10:48 +0000

are we there yet?

By: Reverse Ajax with DWR

Reverse Ajax with DWR — Thu, 25 May 2006 01:50:41 +0000

[...] Reverse Ajax with DWR: “More and more, Ajax apps are using various techniques to keep content fresh in the browser. Essentially, we’re talking about reversing the usual communication flow- the server notices something’s happened, and wants to tell the browser about it. Server ‘calls’ browser, not browser calls server. [...]

By: Phill Kenoyer

Phill Kenoyer — Thu, 25 May 2006 01:26:41 +0000

Why not just use a socket connection? I’ve been using sockets for my “reverse AJAX” for awhile now. Flash, Java, maybe other plug-ins can do it. I use Flash because it’s available on most computer systems. It’s funny how things are going back to the MainFrame. I never figured out whey they changed in the first place.