It's been a week since I posted last. I am really sorry, this is the second time in succession that I have missed my target of posting at least thrice a week. By way of an excuse, all I have is a lame "it's been a bit crazy at work". I am messing around with a lot of client side technologies, like AJAX and the plethora of libraries that accompany it, and all this without really understanding Javascript well enough.
One of the libraries I am checking out is DWR (Direct Web Remoting) . It allows Javascript code to invoke Java objects. All this is done by creating proxy objects in Javascript that make AJAX calls to the DWR Servlet, which in turn invokes the Java objects. I personally think, it's a very nice concept, and it also supports reverse AJAX.
Would you like to know more about DWR? Please comment and let me know. I will then post a series on DWR after completing the current one on Unicode characters.
On a total tangent, here's a little something from Doc Searls on writing to inform readers.
I don’t think of my what I do here as production of “information” that others “consume”. Nor do I think of it as “one-to-many” or “many-to-many”. I thnk of it as writing that will hopefully inform readers.
Informing is not the same as “delivering information”. Inform is derived from the verb to form. When you inform me, you form me. You enlarge that which makes me most human: what I know. I am, to some degree, authored by you. |
| What we call “authority” is the right we give others to author us, to enlarge us. |
| The human need to increase what we know, and to help each other do the same, is what the Net at its best is all about. Yeah, it’s about other things. But it needs to be respected as an accessory to our humanity. And terms like “social media”, forgive me, don’t do that. (At least not for me. |
Note: This text was originally posted on my earlier blog at http://www.adaptivelearningonline.net
Here are the comments from the original post
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COMMENT:
AUTHOR: kishore hariharan
URL:
DATE: 08/29/2007 05:33:38 AM
hi prof,
this concerns the simple yet powerful concept of DWR. My current assignment involves working and exploring the same. I and two of my colleauges actually implemented server side push concept using DWR, as the client demanded real time updates for his Stock Trading Application.
The POC took a while but we managed to finish the implementation with support from JMS.
There are still a few grey areas on using this:
- like the number of live connections DWR can handle at an instance.
-How does DWR actually manage to keep the connections alive is still a mystery. The best we figured was that it sent some heartbeats at frequent intervals. Still not very clear on this.
-Can it really manage to bypass poweful firewalls.
These are a few of the questions we are still researching on. The implementation at the moment works great but still awaits the real test of volume testing.
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COMMENT:
AUTHOR: Parag
DATE: 08/30/2007 10:57:23 AM
Kishore,
These are interesting topics you are researching. I am sure your findings will be of interest to many people.
Do post them to our forum.
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Regards
Parag
Comments