The Anatomy of Apps - How iPhone, Android & Facebook Apps Consume APIs

The Anatomy of AppsHow iPhone, Android & Facebook Apps Consume APIsEd Anuff@edanuffSam Ramji@sramjiBrian Mulloy@landlessness Apigee @apigee

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App App App World of API Internal App APIUser Store Developer APIs Team Systems

Dogs API/dogs/ownersAuthorizationOAuth 2.0RESTful API Design - Second Editionhttp://www.youtube.com/watch?v=QpAhXa12xvU

Build an iPhone App, an Android App and aFacebook Web App**Ruby on Rails app hosted on Herokuhttp://devcenter.heroku.com/articles/facebook

App App App World of API Internal App APIUser Store Developer APIs Team Systems

Start with a basic HTTP request

AndroidHttpClient client = new DefaultHttpClient();HttpGet httpGet = new HttpGet("http://api.apizoo.com/v1/dogs");HttpResponse response = client.execute(httpGet);iOSNSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://api.apizoo.com/v1/dogs"]];NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];Ruby on Railsrequire net/httpresponse = Net::HTTP.get(‘api.apizoo.com/v1’, ‘/dogs’)

Parse the data

AndroidJSONObject dogs = new JSONObject(response);iOSimport "JSONKit.h"NSDictionary *dogs = [response objectFromData];Ruby on Railsrequire yajlparser = Yajl::Parser.newdogs = parser.parse(response) # returns a hash

Resource Object Mapping

RouteMapUse

Android Spring MobileRouterequestEntity = new HttpEntity<Object>(requestHeaders);ResponseEntity<Dog> responseEntity = restTemplate.exchange("http://api.apizoo.com/v1/dogs/15", HttpMethod.GET, requestEntity, Dog.class);

Android Spring MobileMap// Handled with introspection

Android Spring MobileUseDog dog = responseEntity.getBody()

iOS RestKitRoute#import <RestKit/RestKit.h>RKObjectManager* manager = [RKObjectManager objectManagerWithBaseURL:@"http://api.apizoo.com/v1"];RKDynamicRouter* router = [[RKDynamicRouter new] autorelease];manager.router = router;[router routeClass:[Dog class] toResourcePath:@"/dogs" forMethod:RKRequestMethodPOST];[router routeClass:[Dog class] toResourcePath:@"/dogs/(dogID)"];

iOS RestKitMap@implementation Dog+ (NSDictionary*)elementToPropertyMappings { return [NSDictionary dictionaryWithKeysAndObjects: @"name", @"color", nil];}@end

iOS RestKitUseDog* dog = [Dog object];dog.name = @"Rover";Dog.color = @"red";[[RKObjectManager sharedManager] postObject:dog delegate:self];[[RKObjectManager sharedManager] deleteObject:dog delegate:self];

Ruby on Rails ActiveResourceRouteresource :dogs

Ruby on Rails ActiveResourceMapclass Dog < ActiveResource::Base self.site = "http://api.apizoo.com/v1"end

Ruby on Rails ActiveResourceUsedog = Dog.new name: ‘Rover’, color: ‘red’dog.savedog.destroy

Cache the response in a database

Android Jersey + JacksonUsageRoll your own

iOS RestKit + Core DataUsage#import <RestKit/CoreData/CoreData.h>RKObjectManager* manager = [RKObjectManager objectManagerWithBaseURL:@"http://api.apizoo.com/v1"];manager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"DogApp.sqlite"];@implementation Dog + (NSString*)primaryKeyProperty { return @"dogID"; }@end

Ruby on Rails ActiveResource + ActiveRecordUsageclass DogResource < ActiveResource::Base self.site = http://api.apizoo.com/v1endclass Dog < ActiveRecord::Base # the before methods call DogResource methods before_create :create_resource before_update :update_resource before_destroy :destroy_resourceend

Simple to do list

Problem: we want new capabilities in our app notsupported by APIs.

Usergrid - Data & Querieshttp://www.youtube.com/watch?v=zLl56sU5Bt0

Androidusergrid_ sdkiOSUse RESTKitRuby on RailsProbably not applicable

What about offline cases

AndroidRoll your owniOS-(BOOL)reachable {Reachability *r = [Reachability reachabilityWithHostName:@"api.apizoo.com/v1"];NetworkStatus internetStatus = [r currentReachabilityStatus];if(internetStatus == NotReachable) { return NO;}return YES;}Ruby on RailsProbably not applicable

Get authorization out of the wayAssumption: the APIs we consume use OAuth 2

AndroidRoll your own

iOS RestKitRKObjectManager* objectManager = [RKObjectManager sharedManager];objectManager.client.baseURL = @”api.apizoo.com/v1";objectManager.client.OAuth2AccessToken = @"YOUR ACCESS TOKEN";objectManager.client.authenticationType = RKRequestAuthenticationTypeOAuth2;

Ruby on Rails Oauth Gem@consumer=OAuth::Consumer.new("key","secret", site: "api.apizoo.com/v1")@request_token=@consumer.get_request_tokensession[:request_token]=@request_tokenredirect_to @request_token.authorize_url@access_token=@request_token.get_access_token

AndroidBuilt-in JSON, etc.Spring Mobile (bundles Jersey & Jackson)iOSJSONKitRestKitCore DataRuby on RailsYAJLActiveResourceOauth

Coming Up: March Miniseries on Apps & APIs

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THANK YOUQuestions and ideas to:groups.google.com/group/api-craft

THANK YOUContact us at:@edanuffed@apigee.com@sramjisramji@apigee.com@landlessnessbrian@apigee.com

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The Anatomy of Apps - How iPhone, Android & Facebook Apps Consume APIs

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