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Bare-knuckle web development DevDay.LK Johannes Brodwall, Chief scientist Exilesoft

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1 Bare-knuckle web development DevDay.LK Johannes Brodwall, Chief scientist Exilesoft

2 It can be fun and productive to use the basic tools

3 Philosophy Demonstration Ruminations

4 Part I:

5 Why

6 Learn new technologies OR Learn new things about your technology

7 High impact with low ceremony

8 Framework light Test-driven No calculators

9 Light on framework

10 How much time do you spend In debugger? Waiting for build? On Stackoverflow?

11 Frameworks solve 80% of the job…

12 … and makes the rest 10 times as hard

13 Test-driven

14 Fast feedback cycle

15 “I can see how TDD works for toy examples…”

16 “… but how can we use it when we have all these really complicated technologies???”

17 (Hint: “all these complicated technologies” I think I see your problem right here... )

18 “Don’t use a calculator…”

19 Part II:

20 Demo: Phonebook web app

21 What can you learn?

22 Test for web applications Specifying requirements with tests The difference between realistic slow tests (aka “integration”) and limited fast tests (aka “unit”) Dependencies in your tests What does the web server do? Refactoring shortcuts Growing design Alternatives to HTML templates (maybe)

23 Part III:

24 Ruminations

25 Those are my principles, and if you don't like them... well, I have others. - Groucho Marx

26 Build your app this way?

27 Probably not

28 Well, why not?

29 I am most likely insane

30 Or...

31 The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. - George Bernard Shaw

32 Understand what’s going on

33 «Don’t reinvent the wheel»

34

35 Are you using technology to solve your problems?

36 Or so that you don’t have to face your problems?

37 ... yet.

38 Overheated brain

39 95 % test coverage

40 5-10 seconds

41 95 % test coverage 5-10 seconds < 1 day to create «framework»

42 SOAP: 1.Construct XML 2.POST on HttpURLConnection

43 @Override public String getCountryByIp(String ipAddress) { Document soapRequest = soapElement("S:Envelope", $("S:Body", wsxElement("wsx:GetGeoIP", $("wsx:IPAddress", ipAddress)))); Document soapResponse endpoint.postRequest(getSOAPAction(), soapRequest); return $(soapResponse).xpath("/Envelope/Body/*").xpath("GetGeoIPResult/CountryName").text(); }

44 No friction

45 Conclusion:

46 No calculator until…

47 Don’t just learn new technologies.

48 Don’t just learn new technologies => Learn new approaches, techniques and features about the technology you use

49 Thank you Believe nothing on the faith of traditions. Do not believe a thing because many people speak of it. Do not believe on the faith of the sages of the past. Do not believe what you yourself have imagined. After examination, believe what you yourself have tested and found to be reasonable - Buddha


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