From: Richard Dale <Richard_Dale@...>
Date: 2005-11-04T09:17:09+09:00
Subject: Re: DRb recycled objects.

Kevin Brown wrote:

> I started this as a question but figured out the answer while I was
> researching, so I'm posting this here for others that may have the same
> problem.
> 
> The error I received from my code was as follows:
> 
> (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:375:in `_id2ref': 0xdbe53cf6
> is recycled object (RangeError)
>         from (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:375:in `to_obj'
>         from (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:1343:in
>         `to_obj' from (druby://*:9000)
>         /usr/lib/ruby/1.8/drb/drb.rb:1626:in `to_obj' from
>         (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:601:in
> `recv_request'
>         from (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:899:in
> `recv_request'
>         from (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:1453:in
> `init_with_client'
>         from (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:1465:in
> `setup_message'
>         from (druby://*:9000) /usr/lib/ruby/1.8/drb/drb.rb:1435:in
>         `perform'
>          ... 22 levels...
>         from /usr/local/lib/site_ruby/1.8/Qt/qtruby.rb:1040:in
> `method_missing'
>         from /usr/local/lib/site_ruby/1.8/Qt/qtruby.rb:1040:in `exec'
>         from /usr/local/lib/site_ruby/1.8/KDE/korundum.rb:395:in `exec'
>         from ./init.rb:1123
> KCrash: Application 'init.rb' crashing...
> 
> This was happening consistantly from the same place in the code.  I
> finally tracked down the line that was giving me grief, and the issue was
> that I had
> a method called Order#id.  When I was running the code without DRb, this
> worked just fine, but calling id on a DRb proxy object will get you its
> DRb
> object id.  I was returning this value, etc.
> 
> I fixed the problem by changing the method name to order_id, so I know how
> to avoid the error, but I would still like a little more explaination as
> to why exactly this occurred so I can get DRb just that much clearer in my
> mind. :-)
I'm not sure about the cause of your problem.. But as you using Korundum you
could use DCOP instead of DRB. So I'm interested in what you think are the
relative merits of using Drb or DCOP for your application.

-- Richard