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Message from discussion Architecture advice for new project
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Danny Yoo  
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 More options May 15 2012, 5:45 pm
From: Danny Yoo <d...@hashcollision.org>
Date: Tue, 15 May 2012 17:45:26 -0400
Local: Tues, May 15 2012 5:45 pm
Subject: Re: [racket] Architecture advice for new project
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On Tuesday, May 15, 2012, Chad Albers wrote:
> Definitely.  Using Racket's hashes, I can duplicate the same functionality.

> But this hash mechanism bothers me, because I see a informal
> convention developing in Rack middleware, where the middleware starts
> injecting it's own state into the hash, with hacky namespaces on the
> keys to prevent key collisions.  I would like to avoid that.

One of the things I notice about Racket's runtime library design is the use
of opaque values to avoid collisions.  For example, the way that structure
properties work is to create a unique value, a structure type property
descriptor, to be used as the "key".

     http://docs.racket-lang.org/reference/structprops.html

The advantage of this versus using a plain symbol is that the association
doesn't depend on the symbolic representation of the property's name, so
there's no collision potential between properties that are named similarly.
 Maybe you can do something similar?

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