What do you mean by Service?   There are hardly any places in our code 
where something is a singleton.  

On Saturday, February 25, 2017 at 10:31:59 PM UTC-8, Ryan Michela wrote:
>
> I'd like to know the design rationale for why gRPC services 
> implementations are all concurrently executing singletons. There are many 
> possible instancing and threading modes that could have been used.
>
>    - Singleton instancing
>    - Per-call instancing
>    - Per-session instancing
>
>
>    - Concurrent execution
>    - Sequential execution
>
> Concurrent singletons make sense from an absolute throughput angle - no 
> object instantiation or blocking. But concurrent singletons are hardest for 
> developers to work with - service implementors must be keenly aware of 
> shared state and mult-threading concerns. 
>
>    1. Why was concurrent singleton chosen as the only out-of-the-box way 
>    to implement gRPC (java) services? 
>    2. Would API for supporting other threading and instancing modes be 
>    accepted in a PR?
>
>

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