From: "dongcan z." <lists@...>
Date: 2012-06-11T12:31:01+09:00
Subject: Re: about using drb to read data

Robert Klemme wrote in post #1063691:
> On Fri, Jun 8, 2012 at 5:15 AM, dongcan z. <lists@ruby-forum.com> wrote:
>> In my codes , I　use drb to read data from a pipe. I want to read the
>
> AFAIK DRb uses sockets and not pipes...
>
>> pipe data and let them show in client as well as in server. But it
>> cannot done successfully.The results show the pipe date will be splitted
>> in server point and client point,and always error "dmon.rb:63:in
>> `write': Broken pipe - <STDOUT> (Errno::EPIPE)". I google this issue
>> ,and it says pipe data cannot read more than once. So I ask for help in
>> this platform. I need your help.Thank you.
>
> Can you show the code?  Otherwise it will be difficult to help.
>
> Kind regards
>
> robert

The code is like this:
#in the server
########################
class Drb_server
  include DRb::DRbObservable
  def initialize out
    @pipe= out
  end
  def invoke_client
    while line=@pipe.gets
      changed
      notify_observers(line)
    end
  end
end
#The class below is a class that calls class Drb_server and output data 
#through a pipe
class Main
  def start
    @s_out=IO.popen(...a command line that can execute)
    d_server=DRb_server.new @s_out
    DRb.start_service(uri,d_server)
  end
  def info_output
    while str_line=@s_out.gets
      puts str_line
    end
  end
end
#Next is the execute codes
task=Main.new
task.start
task.info_output

####################
#in the drb client
require 'drb/drb'
class Show
  include DRbUndumped
  def update(value)
    puts value
  end
end
monitor=DRbObject.new_with_uri(server_uri)
shower=Show.new
monitor.add_observer(shower)
monitor.invoke_client





I want to output the see the output both in server and in the client.But 
this can not success. So I　wonder if you can give me some suggestions. 
Thank you!

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