From: edwardhatfield1@... (Edward Hatfield)
Date: 2002-03-01T02:18:40+09:00
Subject: DRb TupleSpace Example Poofter

Hello All,

I got excited about the DRb Tuplespace example
in the 'Ruby Developers Guide' book, on page
331 under 'Load-Balancing'.

It looked pretty cool, so I typed in in and
*Poof*  it blew up.  I've double checked the
syntax and looked at the examples that came
with DRb (drb-1.3.4.2).  I'm using ruby version
1.6.6, and all I can say is: 'It doesn't seem
to work as advertised in the Book.'

Here's the server:
#!/usr/bin/ruby
# file comp_s.rb

require "drb"

DRb.start_service

ts = DRbObject.new( nil, ARGV[0] )

loop {
    # get a request from the TupleSpace
    req, a, b = ts.in( ['req', nil, nil] )

    # compute the result
    res = a * b

    # to identify the server on the client side
    host = DRb.uri.split('//')[1].split(':')[0]

    # put the result back into the TupleSpace
    ts.out( ['res', a, b, res, host] )
}


....and Here's the client:
#!/usr/bin/ruby
# file: comp_c.rb

require "drb"

DRb.start_service

ts = DRbObject.new( nil, ARGV[0] )

for a in 6..9 do
    for b in 3..5 do
        ts.out( ['req', a, b] )
    end
end

for a in 6..9 do
    for b in 3..5 do
        _, a, b, res, host = ts.in( ['res', a, b, nil, nil] )
        puts "#{a} * #{b} = #{res}  (#{host})"
    end
end


*Poof*
Any help, to get these examples working
would be appreciated.

Thanks.
Edward.