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From ant elder <ant.el...@gmail.com>
Subject Re: Dynamic service references ?
Date Wed, 23 Nov 2011 09:47:45 GMT
On Tue, Nov 22, 2011 at 1:51 PM, Simon Laws <simonslaws@googlemail.com> wrote:
> On Fri, Nov 18, 2011 at 2:38 PM, Millies, Sebastian
> <Sebastian.Millies@softwareag.com> wrote:
>>
>>
>>> -----Original Message-----
>>> From: Simon Laws [mailto:simonslaws@googlemail.com]
>>> Sent: Friday, November 18, 2011 2:15 PM
>>> To: user@tuscany.apache.org
>>> Subject: Re: Dynamic service references ?
>>>
>> [snip]
>>> Hi Sebastien
>>>
>>> I'm not clear about whether you have a finite number of target service
>>> that you know up front from which you want to select dynamically. Or
>>> whether you don't know the service endpoints but you just know the
>>> service interface.
>>>
>>> Regards
>>>
>>> Simon
>>>
>>> --
>>> Apache Tuscany committer: tuscany.apache.org
>>> Co-author of a book about Tuscany and SCA: tuscanyinaction.com
>>
>> It is the latter: I'm facing an undetermined number of identical services.
>> I know the service interface (the wsdl of an SAP web service), but I do not
>> know in advance which endpoint to talk to.
>>
>> -- Sebastian
>>
>> IDS Scheer Consulting GmbH
>> Geschäftsführer/Managing Directors: Kamyar Niroumand, Ivo Totev
>> Sitz/Registered office: Altenkesseler Straße 17, 66115 Saarbrücken, Germany - Registergericht/Commercial
register: Saarbrücken HRB 19681
>> http://www.softwareag.com
>>
>>
>
> I don't have a good immediate answer and I don't want to distract you
> and Simon from investigating what can be done with service references
> (hence the delay) however two thoughts come to mind.
>
> Mike Edwards reminded me that there is a wiredByImpl flag in SCA that
> we don't exploit in Tuscany today. This is what the OASIS spec says
> about it:
>
> 351 • wiredByImpl : boolean (0..1) - a boolean value, "false" by
> default. If set to "false", the reference is
> 352 wired to the target(s) configured on the reference. If set to
> "true" it indicates that the target of the
> 353 reference is set at runtime by the implementation code (e.g. by
> the code obtaining an endpoint
> 354 reference by some means and setting this as the target of the
> reference through the use of
> 355 programming interfaces defined by the relevant Client and
> Implementation specification).
>
> This doesn't indicate how that might me achieved though as it would be
> runtime specific. We'd probably have to do something similar to what
> you're already looking at, i.e. allow the service reference to be
> retrieved and allow it's model to be edited and restarted.
>
> Something that could be possible already in 2.x is to use the domain
> registry to dynamically route based on SCA target name. This would
> rely on having the target services contributed to the SCA domain and
> then using the SCAClient interface to look them up. I.e. it doesn't
> present a mechanism for manually configuring binding.ws with a URI.
>
> Both of these things are future things but if the current
> investigations get stuck they present avenues for further
> investigation.
>

FWIW I think this would be a terrific function for us to add. Users
have been asking for it over and over again for years now in Tuscany
so theres clearly a desire for it.

   ...ant

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