Re: [soa-rm] David Linthicum Says: "ESB versus Fabric.Stop It!"

[Ken Laskey <klaskey@mitre.org>]

+1

On May 25, 2005, at 1:05 PM, Francis McCabe wrote:

> I think the best way of aligning this is to say:
>
> 1. We need only one service concept.
> 2. We need to be able to capture the relationship between services.  
> Much like we might want to capture the relationship between services  
> and resources.
>
> This is different to modeling lots of services with message busses  
> etc. It is about which concepts are important to modeling service  
> oriented systems.
>
> Frank
>
>
> On May 25, 2005, at 9:33 AM, Duane Nickull wrote:
>
>>
>>
>> Chiusano Joseph wrote:
>>
>>
>>>
>>> Which brings us back to what I believe is the single most important
>>> question for us to answer: Does one service constitute a SOA? Or are  
>>> 2
>>> or more services required?
>>>
>>>
>> An SOA infrastructure (constrained by a specific SOA) will *probably*  
>> have more than one service.  A Reference Model for SOA *will* only  
>> have one service expressed, in alignment with other reference models.  
>>  We can still demonstrate in appendix B the realtionship between  
>> these two things.  Doing so would be prudent IMO.
>>
>>
>>> If 2 or more services are required, then it seems to me that in  
>>> order to
>>> call something a *SOA* reference model, the notion of multiple  
>>> services
>>> must be incorporated - as that is the minimal amount of information
>>> necessary to *effectively* represent/model the "targeted entity"  
>>> (which
>>> is SOA) for the intended audience.
>>>
>>> If one service constitutes a SOA, this implies that a SOA may have  
>>> more
>>> than one service. It then seems to me that one has a choice for their
>>> RM: include only a single service in the model, or include multiple
>>> services. The question then becomes which approach enables the most
>>> effective representation for the intended audience.
>>>
>>> So as you see, I believe everything flows from this single most
>>> important question.
>>>
>>>
>> Which has been answered many times in the same manner I believe.  RM  
>> has one, RA or other specific archtiectures CAN have more than one,  
>> but do not have to to be conformant with the RM.
>>
>> Duane
>>
>
>
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Ken Laskey
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