Ensembles

Core Data Syncing Made Easy

Transcript

2. Drew McCormack
3. Core Data Synchronization Ensembles is a framework for : Backend-agnostic Peer-to-peer synchronization of Core Data persistent stores.
4. Transaction Logs Ensembles breaks down each persistent store into a series of transactions A transaction is : a CRUD operation NSDictionary/JSON : key-value pairs of an object’s property names and values
5. { "type" : "insert", 
 "id" : "CAR12345", 
 "manufacturer" : "Mazda", 
 "model" : "626", 
 "year" : 2003, 
 "owner" : "OWNER54355" 
}
6. Ensembles Data Flow
7. Many CRUD transactions are made in a single save to the data store. All of these transactions get bundled up in files known as transaction logs. A timestamp is applied to each set of changes, so that they can be ordered later, and the files are what get uploaded to the cloud. In other words, Ensembles records the changes to the data store — the so-called deltas — rather than copying the whole data store itself. By only transmitting the changes, the quantity of data transfered is considerably less, and it is also easier to combine changes from different devices: they just get played back in the same order as their timestamps dictate.
8. E L M Ensemble Leech Merge
9. E L M ensemble = [[CDEPersistentStoreEnsemble alloc] initWithEnsembleIdentifier:kMyEnsembleIdentifier persistentStoreURL:sqliteStoreURL managedObjectModelURL:modelURL cloudFileSystem:cloudFileSystem]; [ensemble leechPersistentStoreWithCompletion:^(NSError *error){}]; [ensemble mergeWithCompletion:^(NSError *error){}];
10. How to add Ensembles to your Core Data App ? No changes to existing Core Data stack Automatic de-duplication Automatic merging and migration
11. Global Identifiers To avoid duplication
12. Conflicts Resolution Delegate methods: Should-Save-Merge-Changes Did-Fail-To-Save-Merged-Changes Did-Save-Merge-Changes
13. Ensemble vs The Rest - iCloud (since 2011). Buggy, Black Box manual deduplication, no way to resolve conflicts. Apple is abandonning the automatic Core Data synching. - Cloud Kit (>=iOS8).No built-in support for Core Data. More «open » than iCloud but very raw implementation, No automatic synching, dedup,... - DropBox DataStore API : No built-in support for CoreData. Users have to have a dropbox account. - Simperium : You have to pay for storage...
14. Recap Ensembles 1.0 Open Source(MIT), Core Data sync Peer-to-peer Backend agnostic Ensembles 2 : Commercial for more complex data stores.
15. www.ensembles.io NSConf: vimeo.com/95398295 github.com/drewmccormack/ensembles samples.leanpub.com/ensembles-sample.pdf Idiomatic sample app
16. Ensemble tout devient possible