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Concept and documents in a Happstack concept?

I am starting to make a Haskell web server. I decided to start with the state of Happstack and Happstack. And it's hard for me to understand the concept and state attribute of Happstack. Is this a new kind of database? or just object-graph like system?

Can you explain its concept and attribute (especially regarding ACID, how is it constant data on the disk!) Or tell me that the document describes it well?

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2 answers

Here are two basic introductions to MACID:

http://happstack.com/docs/crashcourse/HappstackState.html#happstack_state

http://www.kuliniewicz.org/blog/archives/2009/04/05/happstackstate-the-basics/

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