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From Antony Blakey <>
Subject Hierarchic Atachments/App Deployments (was: Hosting a Cappuccino application from CouchDB)
Date Fri, 28 Nov 2008 22:37:39 GMT

On 29/11/2008, at 7:39 AM, Justin Walgran wrote:

> That is incredibly helpful. Thank you.
> To take it a step further, I am very interested in Chris Anderson's
> work with distributing apps via CouchDB replication. Is there any way
> the LightsOut application could be incorporated as an attachment like
> Chris's Twitter application?

Hierarchic attachments would be really useful I think. I could  
certainly use them right now.

Because they don't exist, I'm building a notification handler that  
listens for documents with attributes that indicate that .zip  
attachments should be unpacked. I use a separate DB for such documents  
(to filter the notifications) and it will allow me to replicate  
existing static websites over Couch.

Delta replication of attachments would be useful (e.g. XDelta/RSync/ 
Unison) because then I could use either no-compression .zips,  
or .tars, and get much improved replication performance (I do this now  
in a different context).

I'm working on replicating both Smalltalk packages/files and Ruby gems/ 
files via Couch with a handler that manages the deployment and  
execution of such processes (driven by a definition document) for  
deploying applications (that use Couch) via Couch. It's particularly  
useful for Smalltalk because Smalltalk scalability is handled by  
running multiple instances on the same box (ST implementations  
generally use green threads with no native multithreading), which I  
can manage really easily using Erlang.

Antony Blakey
CTO, Linkuistics Pty Ltd
Ph: 0438 840 787

You can't just ask customers what they want and then try to give that  
to them. By the time you get it built, they'll want something new.
   -- Steve Jobs

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