From: Eric Hodel <drbrain@...7.net>
Date: 2005-11-04T06:17:39+09:00
Subject: Re: DRb recycled objects.

On Nov 3, 2005, at 12:41 PM, 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)
>
> 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. :-)

DRb uses the __id__ of the object and the URL of the process it is  
running on to create a proxy object on other DRb processes.   
Redefining #id to #object_id probably had nothing to do with fixing  
your problem.

Usually this error comes when a remote DRb process has a reference to  
an object that was garbage collected before the remote process tried  
to access it.

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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