Re: multicast ping

Thanks for your responses. There's a little detail I left out of my last email (because I didn't know it ...) -- these machines that I want to PING are *not* ours. They are machines that our app will send requests to but we don't have any control over them. Which means I can't put a JGroups client on each machine that listens for PINGs and responds.

So I guess I am stuck with Bela's recommendation, to make some "simple multicasting code", without JGroups, because the other recommendations -- using MessageDispatcher.castMessage() or using JGroups with bare-bones.xml -- both require a JGroups client listening on each machine.

So I guess I'll just start searching for plain-old java.net code. :(

This is the second time I' ve tried to work JGroups into this project and each time, because of project specs, we haven't used it. Bummer.

Thanks,
Bob

----- Original Message ----
From: Bela Ban <belaban@xxxxxxxxx>
To: Robert Bowen <syg6@xxxxxxxxx>
Cc: javagroups-users@xxxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, September 12, 2006 10:10:41 PM
Subject: Re: [javagroups-users] multicast ping

You could do this with simple multicasting code, or you could use
JGroups (with the bare-bones.xml config) to simply send out a multicast
and wait for the first reply. So, no, you don't need to rip out some
JGroups-internal code and use it in your project, but you could simply
use a JChannel to do that.

Robert Bowen wrote:
> Hello all.
>
> I've been out of the JGroups loop for a while but diligently perusing
> the mailing list.
>
> I had a question about an app I need to write. What I need to do is,
> in a given moment send out a multicast "ping" and return the ip of the
> first machine that answers. I know that internally this is what
> JGroups does to keep an updated list of "alive" machines. My question
> is, can I use the same internal mechanism JGroups uses? I don't think
> so, not without deconstructing the code.
>
> The other option is to send out my own multicast message, but if I'm
> not mistaken, multicast messages don't send back responses.
>
> Any thoughts?

--
Bela Ban
Lead JGroups / Manager JBoss Clustering Group
JBoss - a division of Red Hat

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Using Tomcat but need to do more? Need to support web services, security?
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