Logan, Patrick D wrote:
>> I've always been a big fan of Linda, but you must agree that it's a
>> fringe technology. It's been around for ever, but never been a part
>> of the mainstream. The key advantage I see for using SOAP as the
>> foundation for SOA is that *everyone* provides native support for
>> the technology.
>>
>
> Sorry, I am reaching into my backlog of messages. This was from a few
> weeks ago.
>
> I don't understand this comparison. Linda began as a specific
> implementation at Yale 20+ years ago. I think in today's context we
> are discussing Linda as an architectural style.
>
> In that case, comparing an architectural style with SOAP does not make
> sense to me. SOAP is an interface technology. It could be used to
> define interfaces to a Linda-like system or to some other kind of
> system.
>
> What about something like the Irish Public Services Broker? That is
> even simpler than Linda. The PSB is an architectural style that uses
> SOAP as well as other interfaces to get to and from services via a set
> of federated hubs. Each service has an inbound and outbound
> queue. Services push messages to a hub and pull messages from a hub.
>
most of BPEL engines work similarly when using WSA (WS-Addressing) to
send messages from outgoing queue (with optional sender EPR that point
to workflow incoming queue for request-reply pattern) - it shows that in
that sense WSA enables very Linda-like computing environment.
that becomes even more interesting when pubsub is combined with Web
Services (WSA enabled) - too bad that there is more than one contender
for it (WS-Eventing, WSRF/WS-NT, something that merges both)
> It's very simple and it seems to work. One could argue various points
> about it. One could compare it to Linda or to some other style.
>
> What one could not do very effectively, I fear, is compare either of
> these in much depth to SOAP or to SOA. SOAP is just a technology
> description language and SOA is too general.
>
> I think I could argue fairly easily that SOAP could be used in either
> of these architectural styles, and that both styles are specific (in
> the sense of them being formalized using specifications) of the
> general notion of SOA.
>
i think SOA in this way is orthogonal to actual what are architectural
"patterns" used to combine Web Services into something that actually
does work: one can be Linda, BPEL, pubsub, or others.
Long Live Linda :-)
best,
alek
--
The best way to predict the future is to invent it - Alan Kay
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