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From "Craig R. McClanahan" <>
Subject Re: [Chain] examples XML file available?
Date Wed, 24 Sep 2003 17:01:11 GMT
Ted Husted wrote:

> Craig R. McClanahan wrote:
>> All of the above use cases could be covered by a ChainServlet to load 
>> the config stuff and store it in a servlet context attribute.  That 
>> doesn't help the non-web case, but a default solution that uses a 
>> static singleton might work out ok there.
> It just occurred to me that I have a non-web case on my desk now. It 
> converts a file scraped from a HTML page into a couple of fixed-length 
> files that are imported into a database. Problem is, the government 
> agency that creates the HTML page tweaks the format now and again, or 
> adds new information, which makes maintenance an ongoing issue. This 
> seems like a good use for the CoR architechture, since each Command 
> can scan for one of the many possible input formats. If it's not 
> yours, pass it along =:)

Sounds like a pretty exact match to the motivations described in GoF for 
Chain of Responsibility :-).

> I've a maintenance ticket open for this now, so I'll think I'll 
> migrate it to Chain. The best part is that the application is already 
> fully tested, and so it will be a good show of using Unit Tests in a 
> non-web applicaton too. 

That will be a useful exercise.

> -Ted.


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