From: Nit Khair <sentinel.2001@...>
Date: 2008-10-02T21:39:17+09:00
Subject: Re: "ensure" hiding actual error

Stefan Lang wrote:
> 2008/10/1 Nit Khair <sentinel.2001@gmx.com>:
>>> What happens here if my_form never got a value because there was an
>>
>> Aaaah. so you mean if i check for my_form before freeing, then ... since
>> no new exception is raised, the original exception will be displayed.
>> So I _should_ say:
> 
> Generally, the right way is to put the initialization _before_
> the begin/ensure block:
> 
>     resource = init_resource
>     begin
>       # do something with resource
>     ensure
>       resource.close
>     end
> 
> If all you do in the ensure block is to clean up the resource,
> it is useless to put the resource initialization in the begin/ensure
> block, because if the initialization fails, there's nothing to
> cleanup anyway.
> 
> Stefan

Very interesting answer. Let me be honest -- I've been lost as to where 
to start the begin block. Is there any guideline in ruby?

I spent many years in Java where the style was:

try {
   resource = init_resource
} catch (exception) {}
finally {
   resource.close
}

I was following that pattern.

My apps basically:

a. create fields, forms and windows.
b. call key_handler loop
c. cleanup resources when key_handler quits

thanks a lot for valuable thoughts.
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