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From "scott comer (sccomer)" <>
Subject Re: Dynamic Service interfaces?
Date Tue, 13 Jan 2009 20:19:55 GMT
ok, so this sounds pretty familiar to something else we're doing. under 
the hood there is
a message model. you can program to that directly. if you generate code 
for an idl
and then look at the generated files, you can see it. it is totally 
accessible to you for
your own evil plans.

what is lacking right now is firm directions on how to pull that off. 
we're using it to
gateway other protocol into etch, such as jabber, soap, wadl/wsdl, and 
cuae (which
is our application server).

the developer class that you need to attend is only offered in austin. :-)

scott out

Niclas Hedhman wrote:
> On Tue, Jan 13, 2009 at 6:31 PM, scott comer (sccomer)
> <> wrote:
>> perhaps you could illustrate for me what you are trying to do or want to do.
>> have you actually built something in etch yet?
> I have not built something yet. But I can see the potential,
> especially if few things "are taken care of"...
> I am coming from the Java world, but I can appreciate multi-platform
> interoperability. To explain my "vision", I need to give some
> background;
> My framework (Qi4j) has a "Service" concept that are split in 2.
>  - Hosted Service
>  - Imported Service
> Hosted Service is written for the Qi4j framework, and the lifecycle is
> managed by the Qi4j Runtime. It is fairly simple to create an
> "exporter" of the service to a foreign system, as Qi4j has a strong
> model and enforcement of application architecture (layer, modules with
> visibility rules).
> Imported Service is something external, that is registered into Qi4j
> as being available.
> Both are either injected to clients or looked up via a ServiceFinder.
> The easy part of Etch integration to Qi4j would be to consume Etch
> services, since the service creator are responsible to hand a Java
> binding for it, which I think we can simply provide as an Imported
> service. In principle, no big deal, just a matter of trying it out.
> BUT, I would also like to be able to make any Qi4j Service, hosted or
> imported, exposed as a networked service, simply by installing an
> EtchExporter library to any Qi4j application. I can accept that there
> are severe limitations on method arguments and return types, but it is
> not feasible if;
>   - The solution is not easily testable. (unclear on this point at the moment)
>   - The Etch IDL is required to be written by the Java developer. Need
> to generate FROM a Java interface.
> And I think the above can be done with development tools, BUT that
> introduces a nightmare, since we in such case probably need to support
> multiple IDEs, Maven, Ant and possibly 'stand-alone'. Requiring
> tooling ain't "Nice", so the framework can generate the IDL, convert
> IDL to any and all client bindings supported, BUT generation of
> service bindings will require the java compiler, which ain't
> acceptable (can't require JDK installed on downstream user's
> machines).
> AND, if the framework handles everything "under the hood", the service
> IDLs could be downloadable straight from the service providing
> instance for consumption of other clients. Throw in a request
> parameter for the C# source code to quickly get going as a client, and
> now we are talking 'simpler use'.
> I hope this gives a brief overview of what I have in mind. To recap;
>  - Qi4j binds marked Services as Etch services to the network.
>  - Qi4j produces (if possible) the Etch IDL from Java service interface.
>  - Qi4j mounts the the IDL on a URL automatically.
>  - Qi4j generates the client binding code automatically and mounts on URLs.
> Cheers
> Niclas

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