AFIncrementalStore

* Audio of another version of this talk, given at Cocoaconf PDX 2012, is available here: http://soundcloud.com/mattt-thompson/syncing-with-afis

Second to views, networking is the hardest part of iOS programming. And it's several orders of magnitude more difficult if you plan to persist a local copy of the data in Core Data, and keep it in sync with the server. Nevermind the tricky theoretical issues of local cache invalidation and conflict resolution, it's hard enough to get Core Data set up in the first place! At least all of this was true before AFInrementalStore came around. Come learn how AFIncrementalStore works, and in doing so, get a deep dive into Core Data itself.

Transcript

1. AFIncrementalStore Mattt Thompson Cocoaheads SF, October 2012
2. @mattt
10. 
 … … … … AT&T
12. • Simple, Direct Interface
13. • Simple, Direct Interface • Performant
14. • Simple, Direct Interface • Performant • Lightweight
15. • Simple, Direct Interface • Performant • Lightweight • Portable
17. Core Data
18. Core Data • Object Consistency Across Contexts
19. Core Data • Object Consistency Across Contexts • Faulting Behavior
20. Core Data • Object Consistency Across Contexts • Faulting Behavior • Graphical Data Modeling
21. Core Data • Object Consistency Across Contexts • Faulting Behavior • Graphical Data Modeling • Automatic Versioning & Migration
22. Core Data • Object Consistency Across Contexts • Faulting Behavior • Graphical Data Modeling • Automatic Versioning & Migration • 
24. NSIncrementalStore
25. Core Data HTTP Create Read Update Delete Insert POST Fetch / Refresh GET Update PUT / PATCH Delete DELETE
26. AFIncrementalStore
27. NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient
28. NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient
29. NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient
30. NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient
31. NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient
33. NSManagedObjectContext
34. NSPersistentStoreCoordinator NSManagedObjectContext
35. NSPersistentStoreCoordinator NSManagedObjectContext AFIncrementalStore
36. NSManagedObjectContext AFIncrementalStore NSPersistentStoreCoordinator
37. NSManagedObjectContext AFIncrementalStore NSPersistentStoreCoordinator NSPersistentStoreCoordinator*
38. NSManagedObjectContext AFIncrementalStore SQLite NSPersistentStoreCoordinator NSPersistentStoreCoordinator*
39. Augmented Managed Object Model
40. Z_PK Z_ENT Z_OPT ZPOSTID ZUSER Z_AF_RID 1 1 1 2 1 1 3 1 2 914043 29 /posts/914043 914079 31 /posts/914079 915122 57 /posts/915122
41. Z_PK Z_ENT Z_OPT ZPOSTID ZUSER Z_AF_RID 1 1 1 2 1 1 3 1 2 914043 29 /posts/914043 914079 31 /posts/914079 915122 57 /posts/915122
42. Automatic Fault Resolution
43. NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing
44. NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing
45. NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing
46. NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing
47. Insert NSManagedObject
48. Insert NSManagedObject <temporary id>
49. Insert NSManagedObject <temporary id> HTTPClient
50. Insert NSManagedObject <temporary id> HTTPClient POST
51. Insert NSManagedObject <temporary id> HTTPClient POST
52. Insert NSManagedObject <temporary id>
53. Insert NSManagedObject <temporary id>
54. - obtainPermanentIDsForObjects: error:
55. Update NSManagedObject [permanent id]
56. Update NSManagedObject [permanent id]
57. Update NSManagedObject [permanent id] HTTPClient
58. Update NSManagedObject [permanent id] HTTPClient PUT
59. Update NSManagedObject [permanent id] HTTPClient PUT
60. Update NSManagedObject [permanent id]
61. Update NSManagedObject [permanent id]
62. Delete NSManagedObject [permanent id]
63. Delete NSManagedObject ☠
64. NSManagedObject ☠ Delete HTTPClient
65. NSManagedObject ☠ Delete HTTPClient DELETE
66. Delete HTTPClient
67. <AFIncrementalStoreHTTPClient>
68. - representationsForRelationshipsFromRepresentation: ofEntity: fromResponse: - representationsFromResponseObject: {}
69. /posts/123 - resourceIdentifierForRepresentation: ofEntity: fromResponse:
70. Core Data → HTTP - requestWithFetchRequest: withContext: - requestWithMethod: pathForObjectWithID: withContext: - requestWithMethod: pathForRelationship: forObjectWithID: withContext: (Reading)
71. Core Data → HTTP - representationOfAttributes: ofManagedObject: (Writing) - requestForInsertedObject: - requestForUpdatedObject: - requestForUpdatedObject:
73. • REST
74. • REST • JSON-RPC / XML-RPC
75. • REST • JSON-RPC / XML-RPC • SOAP
76. • REST • JSON-RPC / XML-RPC • SOAP • OMGWTFBBQ
77. AFRESTClient
79. GET /companies POST /suppliers PUT /customers/:id GET /country/:id/companies
80. Rack::CoreData Generate REST API Scaffold from Core Data
81. Philosophy
82. I. The Server is the Canonical Source of Truth Philosophy
83. I. The Server is the Canonical Source of Truth II. Be Chatty Philosophy
84. I. The Server is the Canonical Source of Truth II. Be Chatty III. Use HTTP Caching Semantics Philosophy
85. Features
86. Features •Integrates with Any Core Data Stack
87. Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic
88. Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic •Automatically Syncs with Server
89. Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic •Automatically Syncs with Server •Adapts to Any Web Service
90. Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic •Automatically Syncs with Server •Adapts to Any Web Service •Reasonable Code Base (~600 LOC)
91. The Future
92. The Future •Documentation
93. The Future •Documentation •Examples
94. The Future •Documentation •Examples •Performance Optimization
95. The Future •Documentation •Examples •Performance Optimization
96. The Future •Documentation •Examples •Performance Optimization •Advanced Predicates
97. The Future •Documentation •Examples •Performance Optimization •Advanced Predicates •REST Client Convenience Methods
98. Should I Use AFIncremental Store?
99. YES*
100. github.com/ AFNetworking/ AFIncrementalStore
101. Thanks!