Have you evaluated an Agent for your purposes? It has basically exactly
this function.
On Tuesday, January 30, 2018 at 9:17:08 AM UTC-5, Federico Bergero wrote:
>
> Hi all,
> I'm proposing a new GenServer callback `query` similar to the
> call but which does not change the process state.
> I find myself writing a lot of `handle_call` callbacks like
>
> def handle_call(request, _from, state) do
> ...
> ...
> {:reply, result, state}
> end
>
>
>
>
> with the `handle_query` this could be written as
>
> def handle_query(request, _from, state) do
> ...
> ...
> {:reply, result}
> end
>
>
> This is easier to read and write.
>
> A common use case is when you need some computation that depends on the
> GenServer state. Another is when the GenServer has a side effect and the
> calls to the server does not changes the actual process state but an
> external component.
>
>
> Together with the callback a new GenServer.query function should be
> implemented which calls the callback on the server context.
>
> I'm not familiar with the internals of the compiler/GenServer but this
> could also bring optimization opportunities.
>
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