Ready-Steady-Transform

Experiences from pushing groovy into the Enterprise

Transcript

1. Ready, Steady, Transform Niels Bech Nielsen, Nine Consult
2. Niels Bech Nielsen
3. Niels Bech Nielsen 9 CONSULT !   Simply the best !   GR8 with gr**/* technologies !   and java and .net !   and architecture !   and hiring..
4. Niels Bech Nielsen About !   Me, Myself and I!
5. Niels Bech Nielsen What`s the story in Balamory?
 (Wouldn`t you like to know) !   The use case !   The first detour !   The groovy experiment !   What we learned!
6. Niels Bech Nielsen Business as usual !   Use case !   Traders and their numbers !   Risk aversion and volatility !   The competitive edge !   …
7. Niels Bech Nielsen
8. Niels Bech Nielsen Business as usual !   Use case !   Traders and their numbers !   Risk aversion and volatility !   The competitive edge !   …
9. Niels Bech Nielsen Business as usual !   Use case !   Traders and their numbers !   Risk aversion and volatility !   The competitive edge !   …
10. Niels Bech Nielsen The Engineering Approach !   The first detour !   Strong-typed transformation framework !   Extremely complex !   Multiple rules and *exceptions* !   Almost impossible to comprehend !   Slow to develop !   …
11. Niels Bech Nielsen Hyphothesis • If we switch towards a more agile and dynamic approach, we can considerably reduce the backlog. • Groovy is probably better than Java for this
12. Niels Bech Nielsen Outlining a couple of *SPRINTS* !   The Groovy experiment !   Find a few voluntary java programmers !   Setting up plan B !   The very first iteration !   Improvise, adapt and overcome !   …
13. Niels Bech Nielsen So, what is Plan B? !   Before we start !   Generic framework in place !   Lower the customer expectations !   To DSL or not to DSL !   Make sure to measure !   …
14. Niels Bech Nielsen Code, ya numpty... • Easy integration • Evaluate once • Execute continuously Map<String, Object> scope = new HashMap<String, Object>(); // The scope where we bind data in and out Binding binding = new Binding(); binding.setVariable("scope", scope); // Create a shell with the proper binding GroovyShell shell = new GroovyShell(binding); // Evaluate the result shell.evaluate(content); // Now get back what we want.. Closure setup = (Closure) binding.getVariable("setup"); Closure tick = (Closure) binding.getVariable("tick"); Table table = new Table(); setup.call(table); // Preserve original table.. createMemento(table); List<Trade> trades = getBondTrades(); // For each tick.. table = restoreMemento(); tick.call(trades, table); System.out.println(table);
15. Niels Bech Nielsen First Retrospective We STINK! 219 semi- colons Donde esta El hotel Atlantico? No skills No rhytm
16. Niels Bech Nielsen First Retrospective Inspira- tional def is cool Live Edit/ reload Something is working!!
17. Niels Bech Nielsen Key Learning !   Improving development !   Learning the balance of scripts !   Adding Groovy flavour !   Improving domain support !   Structured learning !   Goal is to cash-in on backlog
18. Niels Bech Nielsen Second Retrospective User Feedback, finally Great Gramma Turbo !!!!! Something is working!!
19. Niels Bech Nielsen Second Retrospective What Happened? Upsie!! Darn typos We need a testing framework Collect object-graph when scripts failed
20. Niels Bech Nielsen Plant pot model !   Run it as a sandbox !   Keep it read-only !   Greater dependency on tests and coverage !   Carefully select optimizers
21. Niels Bech Nielsen Development style Imperative Functional Flowbased
22. Niels Bech Nielsen Further reflections !   Things we feared were “needless” !   Speed? !   Risk? !   Stability? !   But something else came up !   Structure? ! Wellformedness?
23. Niels Bech Nielsen Would I do it today? !   IDE support !   Compiler Customization !   Static type checking / compilation !   Types are contracts
24. Niels Bech Nielsen !   Letting go was hard !   You have to walk the walk !   Test, test, test !   Measure, measure, measure
25. Niels Bech Nielsen Skills Courage Commit ment
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27. Niels Bech Nielsen Attribution • Goes to: •  Nine Consult A/S •  GR8 Conf •  http://www.sheep.com •  http://www.flickr.com/photos/mikebaird/6311352526 •  http://www.flickr.com/photos/31029865@N06/6646814881 •  http://www.flickr.com/photos/churkinms/2582615027 •  http://commons.wikimedia.org/wiki/File%3ASMirC-thumbs{up/down}.svg •  http://commons.wikimedia.org/wiki/File:Risk_aversion.jpg •  http://commons.wikimedia.org/wiki/File:Post-it-note-transparent.png •  http://commons.wikimedia.org/wiki/File:Plant_nursery,_pot_rows.jpg
28. Ready, Steady, Go! Niels Bech Nielsen, Nine Consult