agile engineering practices Lionel Bisschoff CEO Kaizania

Transcription

1 agile engineering practices Lionel Bisschoff CEO Kaizania

2 background 2000 Engaged, Thinking People Lean 1800 Interchangeable People Assembly Line Craft 1800 Interchangeable Craft Parts Craft Craft

3 lean

4 7 lean principles 1. Eliminate Waste 2. Build Quality In 3. Defer commitment 4. Deliver Fast 5. Create Knowledge 6. Respect People 7. Optimize the Whole

5 7 lean principles 1. Eliminate Waste 2. Build Quality In 3. Defer commitment 4. Deliver Fast 5. Create Knowledge 6. Respect People 7. Optimize the Whole

6 1. Eliminate waste

7 1. Eliminate waste

8 1. Eliminate waste

9 1. Eliminate waste

10 1. Eliminate waste

11 1. Eliminate waste

12 1. Eliminate waste

13 7 lean principles 1. Eliminate Waste 2. Build Quality In 3. Defer commitment 4. Deliver Fast 5. Create Knowledge 6. Respect People 7. Optimize the Whole Impact on Software Engineering?

14 what are we covering Code Process A story

15 What s the state of your Workshop?

16 the 5 S s Sort Systematize Standardize Shine Sustain what do we have? what do we want? get there smooth and sharpen keep it there Eliminate Waste Build Quality In Create Knowledge Deliver Fast

17 what are we covering Code Process A story

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19 Greatest Challenges in Writing Software? Humans do it Together Then it changes Iterative Software must be 1. Easy to change 2. Easy to understand

20 Easy to Understand CODE FORMATTING

21 what s in a name Why does something exist? What does it do? How is it used? int d; int elapsedtime; int elapsedtimeindays; //elapsed time

22 abstraction Hide complexity Logic => well named functions Functions : are not longer than 20 lines never have > 3 arguments Use class instance variables

23 abstraction Now stuck with classes having lotsa functions? lotsa instance variables? Abstract again create new classes classes hide data and expose functionality Classes have a single responsibility single reason to change Test? most instance variable touched in most methods

24 comments Failure to produce self documenting code Clutter code Comments LIE RTFC

25 doing this in practice? The TDD way Build Quality In Eliminate Waste Create Knowledge Defer Commitment Deliver Fast Add a Test Run tests see new Failure Refactor Write some code Run tests see all pass

26 easy to change

27 combining classes Robert Martin a bad design?? Rigidity Fragility Immobility

28 combining classes Kent Beck a simple design (i.e. Good...) 1. Runs all the tests 2. Contains no duplication 3. Expresses the intent of the programmer 4. Minimizes the number of classes and methods

29 combining classes Design principles Single Responsibility Interfaces Abstractions Quilt coding separation of concerns dependency injection etc.

30 systems Build Quality In Eliminate Waste Create Knowledge Defer Commitment Deliver Fast

31 what are we covering Code Process A story

32 multiple people writing code Source control CI Server Autonomation (Version, Merge, Dependency, Build, Unit/Smoke test, Deploy) System/s System/s System/s DB DB DB Hourly / Daily Daily Often as Possible Dev..Integration QA Stage...Live

33 Trunk = Done branch. No junk on the trunk!! multiple people writing code Trunk Build Quality In Eliminate Waste Sprint Create Knowledge Defer Commitment Release!! Day 1 Day 2 Day 3 Day 4 Day 5 Day Deliver 6 Fast Optimise the whole Respect People Publish to trunk whenever story is Done Firm Policy: Releasable Team A Policy: Unit tested Team B Policy: Unit tested Each branch has owner and policy Merge from trunk to work catch up every day Resolve conflicts on work branch immediately when discovered Soft

34 what are we covering Code Process A story

35 Sportsbetting 24/7 14 languages Busy days 6 bets/second page views/minute simultaneous users

36 Sportsbetting 30 traders 100 call centre agents DB Servlets (logic/db) JSTL/JCTL (data) JSP (html) browsers

37 Sportsbetting 30 traders 100 call centre agents DB Servlets (logic/db) JSTL/JCTL (data) JSP (html) Servlets (logic/db) JSTL/JCTL (data) JSP (html) browsers

38 30 traders Sportsbetting 100 call centre agents DB PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache Servlets (logic/db) JSTL/JCTL (data) JSP (html) PriceCache Servlets (logic/db) JSTL/JCTL (data) JSP (html) browsers

39 30 traders Sportsbetting 100 call centre agents DB DataFeeds PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache Servlets (logic/db) JSTL/JCTL (data) JSP (html) PriceCache Servlets (logic/db) JSTL/JCTL (data) JSP (html) browsers

40 30 traders Sportsbetting 100 call centre agents DB DataFeeds PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache PriceCache oscache Servlets (logic/db) JSTL/JCTL (data) JSP (html) Servlets (logic/db) JSTL/JCTL (data) JSP (html) oscache browsers

41 30 traders Sportsbetting 100 call centre agents Risk Cache DB DataFeeds PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache PriceCache oscache Servlets (logic/db) JSTL/JCTL (data) JSP (html) Servlets (logic/db) JSTL/JCTL (data) JSP (html) oscache browsers

42 30 traders Sportsbetting 100 call centre agents Risk Cache DB DataFeeds PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache PriceCache oscache Servlets (logic/db) JSTL/JCTL (data) JSP (html) Servlets (logic/db) JSTL/JCTL (data) JSP (html) oscache browsers

43 30 traders Sportsbetting Result Result Result Engines Engines Engines 100 call centre agents Risk Cache DB DataFeeds PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache PriceCache oscache Servlets (logic/db) JSTL/JCTL (data) JSP (html) Servlets (logic/db) JSTL/JCTL (data) JSP (html) oscache browsers

44 Sportsbetting

45 Sportsbetting 30 traders 100 call centre agents DB Servlets (logic/db) JSTL/JCTL (data) JSP (html) browsers

46 30 traders Sportsbetting Result Result Result Engines Engines Engines 100 call centre agents Risk Cache DB DataFeeds PriceCache JMS Sports Leagues Events Markets Prices Text/Tokens/Strings PriceCache PriceCache oscache Servlets (logic/db) JSTL/JCTL (data) JSP (html) Servlets (logic/db) JSTL/JCTL (data) JSP (html) oscache browsers

47 Lean means... BDUF not needed 1. Eliminate Waste 2. Build Quality In 3. Defer commitment 4. Deliver Fast 5. Create Knowledge 6. Respect People 7. Optimize the Whole BDUF BAD..?

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