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![A document DB
{
"company": "CleanCode",
"members": [
{ "name": "Gabriele Lana", "role": "software craftsman"},
{ "name": "Federico Galassi", "role": "software craftsman"},
{ "name": "Giordano Scalzo", "role": "software craftsman"}
]
}](https://image.slidesharecdn.com/couchappsrequiemforaccidentalcomplexity-110327060107-phpapp01/75/CouchApps-Requiem-for-Accidental-Complexity-50-2048.jpg)
Uploaded byFederico Galassi
CouchApps: Requiem for Accidental Complexity
The document discusses the complexities of software development, particularly focusing on the evolution of programming architectures such as MVC and the advantages of using document databases like CouchDB for web applications. It highlights the shift from traditional multi-tiered architectures to more lightweight and flexible models that embrace web philosophies and improve scalability and consistency. The authors propose a simplified solution for building web applications using CouchDB, emphasizing its strengths in managing data and facilitating real-time user interactions.
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CouchApps: Requiem for Accidental Complexity
- 1. CouchApps: Requiem for Accidental Complexity Federico Galassi Giordano Scalzo
- 2. We have aproblem...
- 3. Writing software is really hard...
- 4. A little bitof history
- 5.
- 6. A little bitbetter
- 7.
- 8. A different wayof programming
- 9. Two tiers architecture BusinessLogic + Data Presentation
- 10. Three tiers architecture Presentation Business Logic Data
- 11. Tim Berners Lee inventedthe world wide web
- 12. Three tiers internetstyle View + Model Controller Thin client
- 13.
- 14. Browser is a thin client
- 15. Talking to a smartserver
- 16. It all startswith an HTTP request GET / HTTP/1.1 Host: example.org
- 17.
- 18. Web server parsesit Controller
- 19. Dispatch to front controller Controller
- 20. Routing Controller
- 21. Custom action Controller
- 22.
- 23. Query on model objects Model
- 24. ORM fits intoSQL Model
- 25. Hits a RDBMS Model
- 26. Populates a View
- 27. Template engine View
- 28. HTML back to the server View
- 29. HTML back to the client HTTP/1.1 200 OK
- 30. That’s MVC Model View Controller
- 31. A little bitold school
- 32. We love AJAXspeed
- 33. Just need anAPI Model View Json View Controller Api Action
- 34. And some javascript onclient Model View Json View Javascript View Controller Api Action
- 35. Nice one ring torule ‘em all
- 36.
- 37.
- 38. Every change touches theserver
- 39. Hard to scale We must add another serveeeeerrrr
- 40. Last technology cycle WE WERE HERE MVC peak of inflated expectation Visibility productivity disillusionment obsolescence technology trigger maturity
- 41. Last technology cycle peak of inflated expectation NOW HERE Visibility productivity disillusionment obsolescence technology trigger maturity
- 42. Last technology cycle peak of inflated expectation IF YOU’RE Visibility AT THIS CONF productivity YOU MAY BE ALREADY HERE disillusionment obsolescence technology trigger maturity
- 43. Next technology tosave us? ? Visibility maturity
- 44. It’s a cycle but we know one thing ... Visibility maturity
- 45. Specialization is Good
- 48. Very opinionated document DB
- 49. Very good for someproblems
- 50. A document DB { "company": "CleanCode", "members": [ { "name": "Gabriele Lana", "role": "software craftsman"}, { "name": "Federico Galassi", "role": "software craftsman"}, { "name": "Giordano Scalzo", "role": "software craftsman"} ] }
- 51. Self contained data INS J O NO
- 52. Schema-less data DATA YO UR VO LVE E
- 53. Incremental Reduce: sum(checkouts) Map/Reduce 430 Re-reduce 142 288 Reduce 100 42 215 73 { { { { Map "id": 1, "day": 20100123, "checkout": 100 "id": 2, "day": 20100123, "checkout": 42 "id": 3, "day": 20100123, "checkout": 215 "id": 4, "day": 20100123, "checkout": 73 } } } }
- 54.
- 55. Crash-only architecture lucky by design
- 56.
- 57.
- 58.
- 59. Automatic conflict resolution
- 60. Built of theWeb “Django may be built for the Web, but CouchDB is built of the Web. I’ve never seen software that so Jacob Kaplan-Moss completely embraces the Co-creator of Django philosophies behind HTTP.”
- 61. Restful API GET / Returns MOTD GET /_all_dbs List of databases POST /_restart Restart the server GET /_log Tail of the server’s log GET /_config Entire server config GET /_config/<section>/<key> Single config value PUT /_config/<section>/<key> Set a single config value GET /<db> Database info PUT /<db> Create new database DELETE /<db> Delete database GET /<db>/<doc> Latest revision of the document PUT /<db>/<doc> Insert a new revision of the document ... and everything else
- 62. Javascript to program // MAP function(doc) { if(doc.date && doc.title) { emit(doc.date, doc.title); } }
- 63. JSON to exchange data { "_id":"hello-‐world", "_rev":"43FBA4E7AB", "title":"Hello World", "body":"Well hello and welcome to my new blog...", "date":"2009/01/15 15:52:20" }
- 64. Applications are documents
- 65. Replication as deploy
- 66. A modern web applicationserver
- 67. CouchApps are javascriptand html5 applications served directly from CouchDB
- 68. Problem Model View Json View Javascript View Controller Api Action
- 69. Simple Solution HTTP Javascript View
- 70.
- 71.
- 72.
- 73.
- 74.
- 75.
- 76.
- 77. User can posta message Add form elements
- 78. User can posta message On click POST message to couch
- 79. User can posta message Yes!
- 80. User gets astream of messages Add messages container
- 81. User gets astream of messages
- 82. User gets astream of messages Yes!
- 83.
- 84.
- 85.
- 86.
- 87.
- 88.
- 89. Authentication? Check sender isthe authenticated user
- 90. Authentication? { sender: “whitehouse”} // spoofing
- 91. Authentication? Yes!
- 92. BASIC HTTP ????? NoSSL Yes cookie auth via _session api
- 93. UGLY URLS ????? Rewrites and Virtual hosts
- 94.
- 95. But it’s notthat ring
- 96.
- 98. federico.galassi@cleancode.it giordano.scalzo@cleancode.it twitter.com/federicogalassi twitter.com/giordanoscalzo slideshare.net/fgalassi slideshare.net/giordano