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- 1. Better than X Happstack: The framework formerly known as HAppS Presented February 10th, 2009 Thomas Hartman and Matthew Elder 4760 Boelter Hall, UCLA campus
- 2. A brief history of HAppS • Big Bang 2005 • Alex Jacobson markets aggressively • Interest starts to wane in 2007 * For more information see http://www.reddit.com/r/haskell/comments/7ug41/mathew_elder_joins_patchtagcom_as_a_partner_the/c07frjk
- 3. A Lonely 2008 for HAppS • Few commits • Low mailing list traffic • Hard to get help on IRC • Happstutorial released
- 4. Happstack Announced • In 2009 Matthew Elder decides to rebrand HAppS as “Happstack” • It turns out a lot of people want to work on HAppS • Matthew Elder joins Patch-Tag as a partner
- 5. It works!
- 6. How does it work? • Happstack has a builtin HTTP Server • Templating system agnostic (common choices are HSP and HStringTemplate) • State is serialized to disk for durability (like MySQL) • Entire state is kept in ram for maximum performance (no memcached needed)* * This was inspired by Prevayler For more information see http://www.prevayler.org
- 7. Why bother When we have: • Rails • Django • Zope • Catalyst • (…)?
- 8. Haskell is better than Ruby The Ruby claim to fame? terse and beautiful code quicksort in Ruby def quicksort(list) return list if list.size <= 1 pivot = list.pop left, right = list.partition { |e| e < pivot } quicksort(left) + [pivot] + quicksort(right) end quicksort in Haskell qsort [] = [] qsort (x:xs) = qsort (filter (< x) xs) ++ [x] ++ qsort (filter (>= x) xs) Haskell Wins.
- 9. Happstack is better than Rails Model Rails Happstack Object-Relational No ORM needed, Native Impedance Mismatch datatypes via MACID Error-prone database Typesafe migration migration strategy strategy via MACID Database queries scale In-memory map lookups pretty good scale awesomely
- 10. Happstack is better than Rails View Rails Happstack ERB allows mixing HStringTemplate presentation and enforces separation of business logic Controller / View ERB does not prevent HSP guarantees well- malformed xml output formed XML
- 11. Happstack is better than Rails Controller Rails Happstack Scaffolding creates a Composable Server huge mess of Parts keep things simple unmaintainable code Routing logic is Routing logic is unnecessarily magic straightforward
- 12. Haskell is better than Ruby/Rails BUT . . . Ruby programmers have jobs! Clicks Per Day: • Ruby: 1613 • Haskell: 69 • HAppS: Not enough data to give estimates • Source: Google Adwords Estimator Ruby Wins.
- 13. Haskell programmers need jobs! • Some Day . . . • Soon . . . • Haskell Devs will be paid for developing webapps in Haskell • Instead of doing ruby/java/.net by day and Haskell by night
- 14. Rails Envy? Not us! Clicks Per Day: • Ruby: 1613 • Haskell: 69 • HAppS: Not enough data to give estimates • PHP: 8672 The real nemesis of Happstack is PHP.
- 15. The End? • Happstack may not really be better than everything, but we try. • Patch-Tag and happstutorial are proof that Happstack is usable today. • Visit the website: happstack.com • Join us on #happs on irc.freenode.net • OR http://groups.google.com/group/HAppS