Drb_fork

ruby-talk
1

can anyone think of a more elegant way to do this:

   ~ > cat drb_fork.rb
   require 'drb/drb'

   def drb_fork obj
     pipe = IO.pipe
     fork do
       pipe[0].close
       pipe = pipe[1]
       DRb.start_service nil, obj
       pipe.write DRb.uri
       pipe.close
       DRb.thread.join
     end
     pipe[1].close
     pipe = pipe[0]
     uri = pipe.read
     DRb.start_service nil, nil rescue nil
     DRbObject.new nil, uri
   end

   a = drb_fork
   a << 42
   p a.first

   ~ > ruby drb_fork.rb
   42

??

thanks.

-a

···

--

EMAIL :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
PHONE :: 303.497.6469
A flower falls, even though we love it;
and a weed grows, even though we do not love it. --Dogen

===============================================================================

2

Ara.T.Howard wrote:

can anyone think of a more elegant way to do this:

  ~ > cat drb_fork.rb
  require 'drb/drb'

  def drb_fork obj
    pipe = IO.pipe
    fork do
      pipe[0].close
      pipe = pipe[1]
      DRb.start_service nil, obj
      pipe.write DRb.uri
      pipe.close
      DRb.thread.join
    end
    pipe[1].close
    pipe = pipe[0]
    uri = pipe.read
    DRb.start_service nil, nil rescue nil
    DRbObject.new nil, uri
  end

  a = drb_fork
  a << 42
  p a.first

  ~ > ruby drb_fork.rb
  42

Maybe this:

http://raa.ruby-lang.org/project/detach/

I've never used it, but it looks interesting. (I suspect it does the same as you do, though.)

3

can anyone think of a more elegant way to do this:

  ~ > cat drb_fork.rb
  require 'drb/drb'

  def drb_fork obj
    pipe = IO.pipe
    fork do
      pipe[0].close
      pipe = pipe[1]
      DRb.start_service nil, obj
      pipe.write DRb.uri

        ^^^^^^^^^^^^^^^^^^
I take it this is the important line you're looking for?

      pipe.close
      DRb.thread.join
    end
    pipe[1].close
    pipe = pipe[0]
    uri = pipe.read
    DRb.start_service nil, nil rescue nil
    DRbObject.new nil, uri
  end

  a = drb_fork
  a << 42
  p a.first

Use Rinda::RingServer:

http://segment7.net/projects/ruby/drb/rinda/ringserver.html

The description above is the most verbose way to perform service
discovery, since you get a DRb server running as a name service.
Instead you can just plug your front object into the RingServer, if you
only ever need one front.

···

Ara.T.Howard (Ara.T.Howard@noaa.gov) wrote:

--
Eric Hodel - drbrain@segment7.net - http://segment7.net
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4

it does look pretty nice - i didn't know about the drbunix:// uri style -
that's a nice trick since the code won't run w/o fork and there for should be
able to do this.

thanks for the pointer.

-a

···

On Thu, 15 Jul 2004, Joel VanderWerf wrote:

Ara.T.Howard wrote:

can anyone think of a more elegant way to do this:

  ~ > cat drb_fork.rb
  require 'drb/drb'

  def drb_fork obj
    pipe = IO.pipe
    fork do
      pipe[0].close
      pipe = pipe[1]
      DRb.start_service nil, obj
      pipe.write DRb.uri
      pipe.close
      DRb.thread.join
    end
    pipe[1].close
    pipe = pipe[0]
    uri = pipe.read
    DRb.start_service nil, nil rescue nil
    DRbObject.new nil, uri
  end

  a = drb_fork
  a << 42
  p a.first

  ~ > ruby drb_fork.rb
  42

Maybe this:

http://raa.ruby-lang.org/project/detach/

I've never used it, but it looks interesting. (I suspect it does the
same as you do, though.)

--

EMAIL :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
PHONE :: 303.497.6469
A flower falls, even though we love it;
and a weed grows, even though we do not love it. --Dogen

===============================================================================