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AFIncrementalStore Mattt Thompson Cocoaheads SF, October 2012

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@mattt

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 … … … … AT&T

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• Simple, Direct Interface

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• Simple, Direct Interface • Performant

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• Simple, Direct Interface • Performant • Lightweight

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• Simple, Direct Interface • Performant • Lightweight • Portable

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Core Data

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Core Data • Object Consistency Across Contexts

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Core Data • Object Consistency Across Contexts • Faulting Behavior

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Core Data • Object Consistency Across Contexts • Faulting Behavior • Graphical Data Modeling

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Core Data • Object Consistency Across Contexts • Faulting Behavior • Graphical Data Modeling • Automatic Versioning & Migration

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Core Data • Object Consistency Across Contexts • Faulting Behavior • Graphical Data Modeling • Automatic Versioning & Migration • 

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NSIncrementalStore

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Core Data HTTP Create Read Update Delete Insert POST Fetch / Refresh GET Update PUT / PATCH Delete DELETE

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AFIncrementalStore

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NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient

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NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient

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NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient

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NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient

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NSManagedObjectContext Reading NSFetchRequest • entity • predicate NSPersistentStoreCoordinator HTTPClient

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NSManagedObjectContext

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NSPersistentStoreCoordinator NSManagedObjectContext

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NSPersistentStoreCoordinator NSManagedObjectContext AFIncrementalStore

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NSManagedObjectContext AFIncrementalStore NSPersistentStoreCoordinator

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NSManagedObjectContext AFIncrementalStore NSPersistentStoreCoordinator NSPersistentStoreCoordinator*

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NSManagedObjectContext AFIncrementalStore SQLite NSPersistentStoreCoordinator NSPersistentStoreCoordinator*

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Augmented Managed Object Model

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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

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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

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Automatic Fault Resolution

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NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing

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NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing

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NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing

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NSManagedObjectContext NSSaveChangesRequest • inserted • updated • deleted NSPersistentStoreCoordinator HTTPClient Writing

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Insert NSManagedObject

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Insert NSManagedObject

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Insert NSManagedObject HTTPClient

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Insert NSManagedObject HTTPClient POST

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Insert NSManagedObject HTTPClient POST

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Insert NSManagedObject

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Insert NSManagedObject

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- obtainPermanentIDsForObjects: error:

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Update NSManagedObject [permanent id]

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Update NSManagedObject [permanent id]

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Update NSManagedObject [permanent id] HTTPClient

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Update NSManagedObject [permanent id] HTTPClient PUT

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Update NSManagedObject [permanent id] HTTPClient PUT

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Update NSManagedObject [permanent id]

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Update NSManagedObject [permanent id]

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Delete NSManagedObject [permanent id]

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Delete NSManagedObject ☠

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NSManagedObject ☠ Delete HTTPClient

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NSManagedObject ☠ Delete HTTPClient DELETE

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Delete HTTPClient

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- representationsForRelationshipsFromRepresentation: ofEntity: fromResponse: - representationsFromResponseObject: {}

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/posts/123 - resourceIdentifierForRepresentation: ofEntity: fromResponse:

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Core Data → HTTP - requestWithFetchRequest: withContext: - requestWithMethod: pathForObjectWithID: withContext: - requestWithMethod: pathForRelationship: forObjectWithID: withContext: (Reading)

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Core Data → HTTP - representationOfAttributes: ofManagedObject: (Writing) - requestForInsertedObject: - requestForUpdatedObject: - requestForUpdatedObject:

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• REST

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• REST • JSON-RPC / XML-RPC

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• REST • JSON-RPC / XML-RPC • SOAP

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• REST • JSON-RPC / XML-RPC • SOAP • OMGWTFBBQ

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AFRESTClient

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GET /companies POST /suppliers PUT /customers/:id GET /country/:id/companies

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Rack::CoreData Generate REST API Scaffold from Core Data

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Philosophy

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I. The Server is the Canonical Source of Truth Philosophy

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I. The Server is the Canonical Source of Truth II. Be Chatty Philosophy

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I. The Server is the Canonical Source of Truth II. Be Chatty III. Use HTTP Caching Semantics Philosophy

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Features

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Features •Integrates with Any Core Data Stack

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Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic

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Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic •Automatically Syncs with Server

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Features •Integrates with Any Core Data Stack •Encapsulates All Networking Logic •Automatically Syncs with Server •Adapts to Any Web Service

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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)

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The Future

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The Future •Documentation

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The Future •Documentation •Examples

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The Future •Documentation •Examples •Performance Optimization

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The Future •Documentation •Examples •Performance Optimization

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The Future •Documentation •Examples •Performance Optimization •Advanced Predicates

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The Future •Documentation •Examples •Performance Optimization •Advanced Predicates •REST Client Convenience Methods

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Should I Use AFIncremental Store?

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YES*

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github.com/ AFNetworking/ AFIncrementalStore

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Thanks!