From: Eric Hodel <drbrain@...7.net>
Date: 2006-04-25T03:41:58+09:00
Subject: Re: a flaw in tuplespace implementation?

On Apr 23, 2006, at 9:37 PM, xa3a.mc@gmail.com wrote:

> have you tried combining the tuplespace and ring API?

It makes no difference if you use Rinda::Ring or not.

> 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.

So just throw in Rinda::Ring.

> 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)

Since you didn't respond to the same thread I've since lost that  
email.  I suggest you subscribe to the mailing list rather than post  
through the forum.

$ cat rs.rb
require 'rinda/ring'
require 'rinda/tuplespace'

DRb.start_service
Rinda::RingServer.new Rinda::TupleSpace.new
DRb.thread.join
$ cat ts.rb
require 'drb'
require 'rinda/tuplespace'
require 'rinda/ring'
require 'x'

DRb.start_service
ts = Rinda::TupleSpace.new
provider = Rinda::RingProvider.new :TupleSpace, ts, 'Tuple Space'
provider.provide
DRb.thread.join

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

DRb.start_service

rs = Rinda::RingFinger.primary
tuple = rs.read [:name, :TupleSpace, nil, nil]
ts = tuple[2]

x = X.new
x.value = 0

ts.write [:x, x]

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

DRb.start_service

rs = Rinda::RingFinger.primary
tuple = rs.read [:name, :TupleSpace, nil, nil]
ts = tuple[2]

obj = ts.read [:x, nil]

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

$ cat x.rb
class X
   attr_accessor :value
end

$ ruby rs.rb &
[1] 28527
$ ruby ts.rb &
[2] 28528
$ ruby master.rb
$ ruby slave.rb
#<X:0x38ca34 @value=0>
0
100

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
This implementation is HODEL-HASH-9600 compliant

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