Re: Websockets on the IBMi

I can't speak for all implementations obviously, but the client side coding for jwebsockets caters for the sort of disconnects you describe. Once you make the connection, if it disconnects unexpectedly then it will reconnect automatically as soon as it can. It will then process any events that are pending (optionally). It should cope with the "going through a tunnel" scenario. Of course, if the connection has suffered a more permanent problem, all bets are off (stateless or not).

Since I am dealing with an intranet function it is not such a problem for me.

On 12 Jul 2012, at 02:44, "Richard Schoen" <richard@xxxxxxxxxxxxxxx> wrote:

When you open a web socket connection and leave it open and drop offline, wouldn't you think the Websocket would timeout on next attempted use ?

I haven't played with Websockets yet, but I don't think it would be reconnected automatically.

Now of course I haven't read up on Websockets yet, but I visualize it similar to disconnecting from the wall for a minute and losing a Telnet or FTP connection.

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Richard Schoen
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message: 7
date: Wed, 11 Jul 2012 17:20:35 -0500
from: Scott Klement <web400@xxxxxxxxxxxxxxxx>
subject: Re: [WEB400] Websockets on the IBMi

Hello,

I'm not Nathan, but I'd like to offer my opinion (below):

On 7/11/2012 5:03 PM, Kevin Turner wrote:

Are the things you are seeing just normal activity with any TCP/IP
socket connection? There has to be something going on at that low
level with any permanent connection to maintain the connection status.
With respect, maybe you are getting too bogged down in the detail.

The details he described in his message sound EXACTLY like keep-alives in a TCP connection. In other words.. I agree with you, Kevin, what he's seeing is normal TCP data, a part of the TCP protocol that nearly all communications on the Internet are built upon.

I completely agree with your assessment (not quoted for brevity).
Polling is not an efficient substitute for a server having the ability to push data to the client... A persistent technology like Websockets is going to be much more efficient.

I do think it's important to limit the use of technology like websockets to situations where a server-to-client push is required, and not to use them for other things (i.e. they are not a replacement for AJAX!)

But... in the right circumstances, websockets are an exciting technology!


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