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[dsdp-tm-dev] RE: Registering discovered services in RSE
Hello Javier / Dave,
 
Discovery on existing connections: Doing the autodetect process on every "connect" request seems like an overkill for me. I don't think that it is a very common use-case that a previously detected (and used) service would suddenly no longer be available. But I could imagine that when RSE runs into an error during connect, the error dialog could say e.g. "Error - cannot connect to FTP service - do you want to discover services again?"
 
Regarding discovery in the wizard, I absolutely agree with Dave.
  • A set of subsystems / services is installed in RSE (grouped by "SystemType").
  • Discovery will help to select which of the installed services to instanciate for a given connection. This selection process may need user interaction or not, but it would be assisted by Disocvery.
With this background, it seems to make sense to define a SystemType "Discovery" against which all available subsystems / services are registered. By creating a new system of type "discovery", the user says "I'm going to connect to a system for which I know auto-discovery will work".
In the System creation wizard, discovery will disable those subsystems / services that are not actually available. In case more than one service remains for a given subsystem, the user will need to choose which one he prefers.
 
Currenty, the subsystem / service selection for system types is partially static in RSE (through the extension points) and partially manual (through the wizard). Discovery will help to make this more dynamic. What it takes in RSE seems to be mostly improvements of the selection mechanisms in the wizards. Some of these are already covered in
  https://bugs.eclipse.org/bugs/show_bug.cgi?id=142493
 
For some subsystems, their implementor might know that they are not possible to auto-detect (e.g. some JTAG hardware debuggers). Such subsystems would then not be registered with the "Discovery" system type but only with their own system type e.g. "ACME Hardware Debugger Connection".

Cheers,
Martin
--
Martin Oberhuber - WindRiver, Austria
+43(662)457915-85

 

From: David McKnight [mailto:dmcknigh@xxxxxxxxxx]
Sent: Tuesday, July 04, 2006 3:56 PM
To: javier.montalvoorus@xxxxxxxxxxx
Cc: david_dykstal@xxxxxxxxxx; Oberhuber, Martin
Subject: Re: Registering discovered services in RSE


Hi Javier,

What you're doing certainly sounds very interesting and I think it will be very valuable.  I'm wondering whether this service discovery capability should apply to more than just the new connection wizard - I think it would make sense to make use of this with existing connections (for cases where a previously used service is no longer available or a new service has been installed).  Subsystems, such as files and shells, may exist regardless of the service being used - I would think the service discovery mechanism would help determine the following:
  1. Which subsystems should be enabled (and visible).  If no service is available for a subsystem, then there's no sense showing it.
  2. Which service a given subsystem should use.  If only the ftp service is available for files, then it's clear which service should be used by the subsystem.  Things are a little more complicated when there are multiple services for a given subsystem.

When applied to the wizard, then I could imagine the service discovery tool doing the following:
  1. Determining which subsystems actually have services - and therefore which subsystem pages to present in the wizard.
  2. Determining which service should be selected by default to use for a given subsystem.   In the wizard, the user could change the selection if desired.

With that I wouldn't expect to have to do anything with the new host contructor since this function really falls to the subsystem level.

Does that make sense?  Or am I missing somethign you're saying?
____________________________________
David McKnight    
Phone:   905-413-3902 , T/L:  969-3902
Internet: dmcknigh@xxxxxxxxxx
Mail:       D1/619/8200/TOR
____________________________________



javier.montalvoorus@xxxxxxxxxxx

03/07/2006 12:06 PM

To
David McKnight/Toronto/IBM@IBMCA, david_dykstal@xxxxxxxxxx
cc
martin.oberhuber@xxxxxxxxxxxxx
Subject
Registering discovered services in RSE






Hi,

I'm trying to add service discovery capability to the RSE wizard and I'm having some issues that you might be able to clarify.
 
RSE hosts are organised in systemTypes (i.e Unix, Windows...), so it implies always using the predefined lists of services when a specific system type is selected.
In service discovery, knowing the services that will be discovered is not possible , only it is possible to know the potential services to be discovered and its identifiers ("ftp", "ssh"...). This information has to be provided somehow in the plugins. At the moment I provide this info through 2 new system type entries, one generic for all SD capable ("Discovery") and one specific to the service("ftp", "ssh"...)

What I have achieved since now is:

1-  Each plugin for service discovery provides 2 new entries for system types, one generic (for all services, "Discovery") and one specific to the service plugin
2-  The specific one (let's say "ftp"/"ssh"/"telnet") is used to load the required extra wizard pages
3-  Start the wizard and discover a new host with a list of services.
4-  When finishing the wizard, a new host is created, but since only a systemType can be passed to the constructor, passing "Discovery" as a system type creates a host with entries for all the discoverable services, not only for those discovered.

Do you know how could I manage to create a host containing only services discovered at runtime ?

Many thanks,

Javier Montalvo Orús
Engineering Tools
Symbian Software Limited.

Tel: +44 (0)207 154 1091


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