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Hi,
I have been taking a look at the ECF
for Service Discovery and, as Scott and Martin suggested, we could
use it for the TM autodetect process.
Testing it with the Apple's Bonjour
SDK ( http://developer.apple.com/bonjour ), that contains a sample application
to register Bonjour/Zeroconf services, the Dynamic Service Discovery View
from ECF correctly displays the registered services in the same network.
This facility it what we want in the autodetect process, so using
ECF should be fine.
For those interested on how Bonjour
/ Zeroconf works, there is a quite interesting tech talk from Stuart
Cheshire at:
http://video.google.com/videoplay?docid=-7398680103951126462&q=Google+techtalks
Although Zeroconf seems a good solution
for autodetect, does anybody have other alternatives worth to be considered
or any inconvenient using Zeroconf ?
Regards,
Javier Montalvo Orús
Engineering
Tools
Symbian Software Limited.
Tel: +44 (0)207 154 1091
"Oberhuber, Martin"
<Martin.Oberhuber@xxxxxxxxxxxxx>
Sent by: dsdp-tm-dev-bounces@xxxxxxxxxxxx
27/04/2006 10:56
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Subject
| FW: [dsdp-tm-dev] autodetect |
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FYI,
comments from Scott Lewis (ECF)
regarding autodetect, Zeroconf / Bonjour, DNS-SD and ECF.
From: Scott Lewis [mailto:slewis@xxxxxxxxxxxxx]
Sent: Thursday, April 27, 2006 2:53 AM
To: Oberhuber, Martin
Subject: Re: FW: [dsdp-tm-dev] autodetect
Hi Martin,
No, you've got everything right! And thanks!!
See a couple of supporting comments inline.
From: dsdp-tm-dev-bounces@xxxxxxxxxxx
[mailto:dsdp-tm-dev-bounces@xxxxxxxxxxx]
On Behalf Of Oberhuber, Martin
Sent: Wednesday, April 26, 2006 4:01 PM
To: Target Management developer discussions
Subject: RE: [dsdp-tm-dev] autodetect
Hello Javier,
these are very interesting pointers
and ideas.
I had a look at http://www.dns-sd.org
and I got the feeling that it is an extension of what
Apple's Zeroconf / Bonjour does
on the LAN, to the wide area network through the DNS
transport mechanisms.
Yes...that's right. Zeroconf/Bonjour uses dns-sd service type/service
naming conventions though...so that everything will work beyond the lan
environment at the appropriate time.
What I found most interesting
on the page, was the list of standardized protocol names
which they use in their descriptive
strings for the services:
http://www.dns-sd.org/ServiceTypes.html
I guess we could definitely use
those to publish existence of services, regardless of what
sort of protocol / transport we
finally choose to use.
In fact, I've already seen these
specifiers before in the ECF discovery. ECF already has
a provider implementation for
Zeroconf / Bonjour, which uses the same strings.
Consequently, looking at the ECF
Discovery API might be the next logical step for us.
Yes...ECF abstracts the dns-sd service type info (represented as String
by jmdns) as an org.eclipse.ecf.core.identity.ServiceID (of sub-type defined
by the jmdns Namespace extension...i.e. JMDNSServiceID).
What I'm not so sure about is,
if running a DNS server on the device is the right thing to
do. There are already devices
like printers etc. implementing Zeroconf / Bonjour, and I
don't think they run full-blown
DNS servers. When I'm not mistaken, it's a very simple
protocol.
Yes, Zeroconf/Bonjour is a very simple protocol. If you are only
interested in a lan-based discovery via zeroconf, it's not even necessary
to run DNS anywhere...and I think you can make up service types/service
names with anything you want (i.e. you don't have to have a dns-sd name).
For example, I defined an _ecftcp service type. But if you
want to do dns-sd discovery across lans, then DNS (at least some DNS server)
and dns-sd names does become necessary.
But you can use ecf discovery with the jmdns provider protocol to publish
services and receive asynch callbacks about the network availability of
those services easily enough right now with ECF.
For example:
IContainer container = ContainerFactory.getDefault().createContainer("ecf.discovery.jmdns");
container.connect(null,null);
IDiscoveryContainer dc = (IDiscoveryContainer) container.getAdapter(IDiscoveryContainer.class);
// use dc to register services or to setup service listeners
Also, there's example code in the org.eclipse.ecf.example.collab plugin
that sets up a little ECF Discovery view that shows services discovered
on the LAN via zeroconf. See org.eclipse.ecf.example.collab.DiscoveryStartup.setupDiscovery().
The view class is: org.eclipse.ecf.example.collab.CollabDiscoveryView.
The 'setDiscoveryController' method gets called in the CollabDiscoveryView
constructor.
Scott
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