I agree with Josh. It is very unlikely that we would introduce new keywords 
for defining a different kind of service.

On Wednesday, April 26, 2017 at 12:45:29 PM UTC-7, Josh Humphries wrote:
>
> I think the right approach to something like this would be to use the 
> existing service definition support and write a protoc plugin that does the 
> code gen. To layer on extra things -- for concepts/features that OSGI 
> supports but that can't be modeled just with proto service definitions -- 
>  you could probably use custom options for services and methods. More 
> complicated things may require clever modeling with the request/response 
> types (and maybe custom message and field options, too). These primitives 
> can likely take you pretty far, without introducing any special syntax or 
> keywords in protos.
>
>
> ----
> *Josh Humphries*
> [email protected]
>
> On Tue, Apr 25, 2017 at 6:53 PM, Scott Lewis <[email protected]> 
> wrote:
>
>> I've been happily using protocol buffers to implement Java <-> Python 
>> interaction using OSGi Remote Services [1,2].   
>>
>> Remote Services is a spec that extends OSGi services to out-of-process 
>> access.   A nice thing about the Remote Services spec is that it is 
>> transport-independent...allowing arbitrary wire protocols and serialization 
>> formats via a distribution provider.  For example, I've created 
>> distribution providers based upon Py4j [1], and grcp/protocol buffers [2].  
>> The distribution provider(s) can be selected at runtime for individual 
>> remote services.
>>
>> One thought I've had would be to allow remote services to be declared in 
>> .proto files, and generate the osgi remote service a) metadata; b) impl 
>> code; c) client code.  
>>
>> I think one way to do this would be to implement protoc language 
>> additions for handling the service keyword, as grcp does.  Another way 
>> would be to add something like osgiremoteservice keyword to protoc for 
>> handling declaring and generating osgi remote services across multiple 
>> languages.
>>
>> Question:  Is there a way to add a new keyword to protoc?   I would 
>> prefer not to just provide an impl of the existing proto3 'service' 
>> keyword, because an osgi remote service has other/additional behavior (e.g. 
>> dynamics, async access, etc) based upon the OSGi service registry.
>>
>> Thanks,
>>
>> Scott
>>
>> [1] https://github.com/ECF/Py4j-RemoteServicesProvider
>>
>> [2] https://github.com/ECF/grpc-RemoteServicesProvider
>>
>>
>>
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>

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