From: Robert Klemme <shortcutter@...>
Date: 2009-03-02T21:48:50+09:00
Subject: Re: Using YAML for inter-process communication - anything built-in ?

On 02.03.2009 13:14, Thibaut Barrère wrote:
> Hi,
> 
> I'm just wondering - I implemented something (http://github.com/thbar/
> petite-lettre/tree/master) I believe probably already exists, can
> anyone tell me if it does ?
> 
> I'm using YAML to communicate using stdin/stdout between a Ruby MRI
> process and a JRuby process (I will soon use it to communicate between
> IronRuby and JRuby).
> 
> The parent process launches the child using:
> 
> PetiteLettre.call("ruby child_program.rb", { :command
> => :start_sale, :isbn => "1234567", :price => 12.4 })
> 
> and the child responds with:
> 
> PetiteLettre.receive do |message|
>   response = {}
>   if message[:command] == :start_sale
>     # do something here
>     raise "Price is too low" if message[:price] < 15.0
>     response[:status] = "OK"
>     response[:transaction_id] = "1235"
>   else
>     raise "Unknown command '#{message[:command]}'"
>   end
>   response
> end
> 
> If something already exists in Ruby to do that this way, I'd like to
> know about it.
> 
> Any idea ?

I am not sure about portability of Marshal across Ruby implementations. 
  In case it is given you could achieve similar results using DRb.

Kind regards

	robert