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A walkthrough of building new apps on top of the Indivo iOS framework, as well as integrating it with existing apps to cloud-enable them. …

A walkthrough of building new apps on top of the Indivo iOS framework, as well as integrating it with existing apps to cloud-enable them.

By Pascal Pfiffner, MD Ph.D., Children's Hospital Informatics Program

More in: Technology , Education
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  • 1. Indivo iOSframework
  • 2. Goals• Drop-in to existing Cocoa projects• Provide a low entry barrier into PHR• Make Indivo a viable choice for App developers who want to move their users’ data into the cloud
  • 3. The framework• Handles authentication (OAuth)• Provides Indivo objects (automatic XML handling)• Knows where an object comes from (REST paths)• Provides messaging functionality
  • 4. Handling OAuth• Class INServerCall to encapsulate requests• Uses MPOAuth, an OSS OAuth framework for iOS, transparently‣ OAuth is handled for you
  • 5. From Schema to Cocoa• The developer should not have to deal with XML serialization/deserialization‣ Provide classes for all Indivo document types• We have to write Objective-C classes for all types‣ A generator creates Cocoa classes from Indivo’s XSD and SDMJ schemas
  • 6. Self-aware objects• Document objects know their record• Records know their server• Framework knows the server actions‣ REST methods can be inferred for all tasks
  • 7. iOS framework Abstract logic into Cocoa objects selectRecord:Server Record addDocumentOfClass: fetchReportsOfClass: push: Docs replace: archive: ...
  • 8. App Flow Setup server = [IndivoServer serverWithDelegate:self];#define kIndivoFrameworkServerURL @“http://10.17.20.127:8000”#define kIndivoFrameworkUIServerURL @“http://10.17.20.127:8001”#define kIndivoFrameworkAppId @“medsample@apps.indivo.org”#define kIndivoFrameworkConsumerKey @“nkd8cg02mgo34sntkao9”#define kIndivoFrameworkConsumerSecret @“1acgk9804wkmraoceu02”
  • 9. App Flow Logging in[server selectRecord:^{ }];server.activeRecord
  • 10. App Flow Adding a medicationMedication *med = [record addDocument:Medication];med.drugName = [INCodedValue new];med.drugName.title = @“Tylenol”;med.drugName.system ... [med push:^{ }];
  • 11. App Flow Sending a message[med.activeRecord sendMessage:@“New medication added” withBody:@“See medlist app”
 ofType:INMessageTypePlaintext severity:INMessageSeverityMedium attachments:nil callback:^{ }];
  • 12. Integrating Indivo Into Existing Apps
  • 13. Growth Charts App
  • 14. Growth Charts App Data ModelsCHPatientSource selectPatient:^{ } CHPatient ageAtDate: measurementSetsContainingDataTypes: CHMeasurementSet date CHMeasurement value CHMeasurement value CHMeasurement value
  • 15. Growth Charts App Local Data Source• Override selectPatient: • Instantiate a CHPatient • Read CSV data as measurement sets
  • 16. Growth Charts App Indivo Data Source• Call Indivo’s selectRecord: method• Within the callback block: • Fetch patient demographics • Create CHPatient with record demographics • Fetch patient’s vitals • Convert Indivo vitals into measurement sets
  • 17. Growth Charts App Indivo-Enabled (read-only)• 2 lines + app setup file to setup Indivo server instance• 9 lines to convert IndivoRecord to CHPatient• 21 lines to convert Indivo vitals into CHMeasurementSet
  • 18. Documentation• Take a look at README.md• Checkout the sample medication app• Technical documentation available online: http://docs.indivohealth.org/projects/indivo-x-ios- framework/en/latest/
  • 19. Playing with Medications
  • 20. Version 2.0 α Available with the other Indivo sources from: https://github.com/chb/IndivoFramework-iosCheckout branch dev_two (tag hackathon_2012)