From: xa3a.mc@...
Date: 2006-04-24T13:37:34+09:00
Subject: Re: a flaw in tuplespace implementation?

have you tried combining the tuplespace and ring API? your example 
indeed works when ring API is not used, simply providing a tuplespace as 
a DRb service instead of a Ring service. but i'd rather have some code 
that would enable me to automatically find a tuplespace, not manually by 
passing the tuplespace's uri. i modified your code to show you the 
problem i faced in my first post, and added two ring files (name server 
and space provider, which is actually your code as listed in your 
segment7 site)



Eric Hodel wrote:

> $ cat ts.rb
not needed, since i am using ring API to provide the tuplespace

$ cat master.rb
require "rinda/ring"
require 'drb'
require 'x'

DRb.start_service

#ts = DRbObject.new nil, ARGV.shift
ringServer = Rinda::RingFinger.primary
ts = ringServer.read([:name, :TupleSpace, nil, nil])[2]
ts = Rinda::TupleSpaceProxy.new ts

x = X.new
x.value = 0

ts.write [:x, x]

$ cat slave.rb
require "rinda/ring"
require 'drb'
require 'x'

DRb.start_service

#ts = DRbObject.new nil, ARGV.shift
ringServer = Rinda::RingFinger.primary
ts = ringServer.read([:name, :TupleSpace, nil, nil])[2]
ts = Rinda::TupleSpaceProxy.new ts

obj = ts.read [:x, nil]

p obj.last
p obj.last.value
obj.last.value = 100
p obj.last.value

$ cat name_server.rb
require "rinda/ring"
require "rinda/tuplespace"

DRb.start_service

Rinda::RingServer.new Rinda::TupleSpace.new

DRb.thread.join

$ cat space_provider.rb
require "rinda/ring"
require "rinda/tuplespace"

DRb.start_service

ts = Rinda::TupleSpace.new
provider = Rinda::RingProvider.new :TupleSpace, ts, "Tuple Space"
provider.provide

DRb.thread.join


$ ruby name_server.rb &
$ ruby space_provider.rb &
$ ruby master.rb &
...[error strings]
in `init_with_ary': undefined method `size' for 
<DRb::DRbUnknown:0x28d21d0> (NoMethodError)
...[another error strings]
$ ruby slave.rb

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