Hypermedia for the iOS developer - Swipe 2012
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What is Hypermedia and how does it help developers create network connected applications.
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Hypermedia for the iOS developer - Swipe 2012
- 1. Network Connected hypermedia for the iOS developer Kevin O’Neill PlayUp Pty Ltd
- 2. Roadmap • Some background • Introduction to hypermedia • Consuming a hypermedia API • Bit’s and Pieces SWIPE CONFERENCE 2012
- 3. CTO PlayUp SWIPE CONFERENCE 2012
- 4. Blood SWIPE CONFERENCE 2012
- 5. This will be an introduction SWIPE CONFERENCE 2012
- 6. Opinionated SWIPE CONFERENCE 2012
- 7. ReST SWIPE CONFERENCE 2012
- 9. It’s been mutated to the point of being meaningless SWIPE CONFERENCE 2012
- 10. CRUD = ReST SWIPE CONFERENCE 2012
- 11. URL Patterns = REST SWIPE CONFERENCE 2012
- 12. http://example.com/products/<id> SWIPE CONFERENCE 2012
- 13. Well No SWIPE CONFERENCE 2012
- 14. Hypermedia API’s SWIPE CONFERENCE 2012
- 15. The Good SWIPE CONFERENCE 2012
- 16. Loose Coupling SWIPE CONFERENCE 2012
- 17. Simplicity / Uniformity SWIPE CONFERENCE 2012
- 18. Scale better SWIPE CONFERENCE 2012
- 19. The Bad SWIPE CONFERENCE 2012
- 20. Not the most succinct form SWIPE CONFERENCE 2012
- 21. Cache invalidation is hard SWIPE CONFERENCE 2012
- 22. It takes more thought SWIPE CONFERENCE 2012
- 23. What is a hypermedia API SWIPE CONFERENCE 2012
- 24. Use HTTP Properly* SWIPE CONFERENCE 2012
- 25. Use links to guide clients through processes SWIPE CONFERENCE 2012
- 26. "REST is software design on the scale of decades: every detail is intended to promote software longevity and independent evolution. Many of the constraints are directly opposed to short-term efficiency. Unfortunately, people are fairly good at short-term design, and usually awful at long-term design." - Roy Fielding SWIPE CONFERENCE 2012
- 27. Consuming a Hypermedia API SWIPE CONFERENCE 2012
- 28. { "title": "Raiders vs Bulldogs", "short_title": "RAI vs BUL", "scheduled_start_time": "2012-‐08-‐24T09:35:00Z", "start_time": "2012-‐08-‐24T09:35:00Z", "end_time": "2012-‐08-‐24T12:24:54Z", "clock": { "summary": "2ND 61:56", "minutes": 61, "seconds": 56, "period": 2 }, ... SWIPE CONFERENCE 2012
- 29. Content-‐Type SWIPE CONFERENCE 2012
- 30. Content-‐Type application/json SWIPE CONFERENCE 2012
- 31. Content-‐Type application/vnd.example.contest.rugby_league+json SWIPE CONFERENCE 2012
- 32. Strategy SWIPE CONFERENCE 2012
- 33. @protocol HTTPResponseHandler <NSObject> -‐ (void)handle:(NSHTTPURLResponse *)response forRequest:(id <RequestToken>)request; @end @interface RegistryHandler : NSObject <HTTPResponseHandler> -‐ (void)registerHandler:(id<HTTPResponseHandler>)handler for:(id<TypeMatcher>)matcher; @end SWIPE CONFERENCE 2012
- 34. Errors SWIPE CONFERENCE 2012
- 35. "scores": [ { "total": 34, "summary": "34", "team": { ":href": "http://example.com/teams/569", ":type": "application/vnd.example.sport.team+json" ":links" [ { "rel": "alternate", "href": "http://example.com/teams/569.xml" "type": "application/vnd.example.sport.team+xml" }, { "rel": "alternate", "href": "http://example.com/teams/569.html" "type": "text/html" } SWIPE CONFERENCE 2012
- 36. "scores": [ { "total": 34, "summary": "34", "team": { ":href": "http://example.com/teams/569", ":type": "application/vnd.example.sport.team+json" ":links" [ { "rel": "alternate", "href": "http://example.com/teams/569.xml" "type": "application/vnd.example.sport.team+xml" }, { "rel": "alternate", "href": "http://example.com/teams/569.html" "type": "text/html" } SWIPE CONFERENCE 2012
- 37. "scores": [ { "total": 34, "summary": "34", "team": { ":href": "http://example.co/t/d/dogs.json", ":type": "application/vnd.example.sport.team+json", ":links" [ { "rel": "alternate", "href": "http://example.com/teams/569.xml" "type": "application/vnd.example.sport.team+xml" }, { "rel": "alternate", "href": "http://example.com/teams/569.html" "type": "text/html" } SWIPE CONFERENCE 2012
- 38. Versioning and Alternates SWIPE CONFERENCE 2012
- 39. "scores": [ { "total": 34, "summary": "34", "team": { ":href": "http://example.com/teams/569", ":type": "application/vnd.example.sport.team+json", ":links" [ { "rel": "alternate", "href": "http://example.com/teams/569.xml" "type": "application/vnd.example.sport.team+xml" }, { "rel": "alternate", "href": "http://example.com/teams/569.html" "type": "text/html" } SWIPE CONFERENCE 2012
- 40. Accept application/vnd.example.sport.team+xml SWIPE CONFERENCE 2012
- 41. Accept application/vnd.example.sport.team+xml,*/* SWIPE CONFERENCE 2012
- 42. "scores": [ { "total": 34, "summary": "34", "team": { ":href": "http://example.com/teams/569", ":type": "application/vnd.example.sport.team+json", ":links" [ { "rel": "alternate", "href": "http://example.com/teams/569.xml" "type": "application/vnd.example.sport.team+xml" }, { "rel": "alternate", "href": "http://example.com/teams/569.html" "type": "text/html" } SWIPE CONFERENCE 2012
- 43. NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url]; [request setHTTPMethod:@"GET"]; [request addValue:@"text/html,*/*" forHTTPHeaderField:@"Accept"]; SWIPE CONFERENCE 2012
- 44. Caching SWIPE CONFERENCE 2012
- 45. NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:kMemoryCacheSize diskCapacity:kDiskCacheSize diskPath:cache_path]; [NSURLCache setSharedURLCache:sharedCache]; SWIPE CONFERENCE 2012
- 46. ETag "9461cf5ecc0f4df6e880ce76479aba90" Cache-‐Control max-‐age=15, public Vary Accept-‐Language SWIPE CONFERENCE 2012
- 47. NSMutableURLRequest *request = ... [request setValue:etag forHTTPHeaderField:@"If-‐None-‐Match"]; SWIPE CONFERENCE 2012
- 48. NSMutableURLRequest *request = ... [request setValue:etag forHTTPHeaderField:@"If-‐None-‐Match"]; [request setCachePolicy: NSURLRequestReloadIgnoringLocalCacheData]; SWIPE CONFERENCE 2012
- 49. static NSUInteger calc_timeout(NSHTTPURLResponse *response) { NSUInteger new_timeout = k_default_expires; NSString *cache_control = [[response allHeaderFields] valueForKey:@"Cache-‐Control"]; if (nil != cache_control) { NSRange maxage_range = [cache_control rangeOfString:@"max-‐age="]; if (maxage_range.location != NSNotFound) { NSString *timeout_str = [cache_control substringFromIndex:NSMaxRange(maxage_range)]; NSRange comma_range = [timeout_str rangeOfString:@","]; if (NSNotFound != comma_range.location) { timeout_str = [timeout_str substringToIndex:comma_range.location]; } new_timeout = (NSUInteger)[timeout_str integerValue]; } } return new_timeout; } SWIPE CONFERENCE 2012
- 50. Bits and Pieces SWIPE CONFERENCE 2012
- 51. Test from other countries SWIPE CONFERENCE 2012
- 52. Charles is your friend SWIPE CONFERENCE 2012
- 53. HTTPShouldUsePipelining SWIPE CONFERENCE 2012
- 54. gzip encoding is your friend SWIPE CONFERENCE 2012
- 55. Proxies Screw You SWIPE CONFERENCE 2012
- 56. Questions Kevin O’Neill CTO - PlayUp @kevinoneill kevin@playup.com SWIPE CONFERENCE 2012