![[skudetail viewDidLoad];
NSString *query = [NSString stringWithFormat:@"skudetail/%@.json", [sku valueForKey:@"skuNum"]];
[CometAPI get:query parameters:nil completionBlock:^(CometAPI *api, id object, int status, NSError *error) {
if (error) {
[PRPAlertView showWithTitle:@"Error" message:@"Unable to fetch product details" buttonTitle:@"Continue"];
} else {
self.sku = object;
[self.tableView reloadData];
}
}];](https://image.slidesharecdn.com/errest-ios-130622141433-phpapp01/85/iOS-for-ERREST-17-320.jpg)
![CometAPI get
- (void)get:(NSString *)requestString parameters:(NSDictionary *)parameters completionBlock:(CometAPICompletionBlock)completion {
NSURL *requestURL = [[NSURL URLWithString:endpoint] urlByAddingPath:requestString andParameters:parameters];
NSLog(@"get: '%@'", [requestURL absoluteString]);
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:requestURL];
if (userName && password && useBasicAuthentication) {
NSString *authString = [[NSString stringWithFormat:@"%@:%@", userName, password] base64];
NSString *authHeader = [NSString stringWithFormat:@"Basic %@", authString];
[request setValue:authHeader forHTTPHeaderField:@"Authorization"];! !
}
//[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
! [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
...](https://image.slidesharecdn.com/errest-ios-130622141433-phpapp01/85/iOS-for-ERREST-18-320.jpg)
![CometAPI get
...
self.completionBlock = completion;
[[UIApplication sharedApplication] prp_pushNetworkActivity];
self.restQueue = [[NSOperationQueue alloc] init];
self.restQueue.name = @"Comet REST Queue";
[NSURLConnection sendAsynchronousRequest:request queue:self.restQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
if (error) {
NSLog(@"%s %@", __PRETTY_FUNCTION__, error);
[self callCompletionBlockWithObject:nil error:error];
} else {
if ([data length] == 0) {
NSLog(@"no data");
[self callCompletionBlockWithObject:nil error:[NSError errorWithDomain:@"com.plsys.semaphore.CometAPI" code:1001 userInfo:nil]];
} else {
NSError *error;
id object = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
if (object) {
[self callCompletionBlockWithObject:object error:nil];
} else {
NSLog(@"received bad json: (%d) '%@'", [data length], [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
[self callCompletionBlockWithObject:nil error:[NSError errorWithDomain:@"com.plsys.semaphore.CometAPI" code:1002 userInfo:nil]];
}
}
}
}];
}](https://image.slidesharecdn.com/errest-ios-130622141433-phpapp01/85/iOS-for-ERREST-19-320.jpg)
![CometAPI Methods
- (void)callCompletionBlockWithObject:(id)object error:(NSError *)error {
dispatch_async(dispatch_get_main_queue(), ^{
[[UIApplication sharedApplication] prp_popNetworkActivity];
self.completionBlock(self, object, error);
});
}](https://image.slidesharecdn.com/errest-ios-130622141433-phpapp01/85/iOS-for-ERREST-20-320.jpg)
![CometAPI Methods
- (NSURL *)urlByAddingPath:(NSString *)path andParameters:(NSDictionary *)parameters; {
NSString *requestString = [[self absoluteString] stringByAppendingPathComponent:path];
if (parameters) {
requestString = [requestString stringByAppendingString:@"?"];
BOOL first = YES;
for (NSString *key in [parameters allKeys]) {
if (!first) {
requestString = [requestString stringByAppendingString:@"&"];
}
requestString = [requestString stringByAppendingString:[NSString stringWithFormat:@"%@=%@", key, [[[parameters
objectForKey:key] description] stringByAddingPercentEscapesUsingEncoding:kCFStringEncodingUTF8]]];
first = NO;
}
}
return [NSURL URLWithString:requestString];
}](https://image.slidesharecdn.com/errest-ios-130622141433-phpapp01/85/iOS-for-ERREST-21-320.jpg)
iOS for ERREST
- 1. iOS for ERREST Paul Lynch @pauldlynch paul@plsys.co.uk
- 2. • We know WebObjects & ERREST • The client problem • Example ERREST/iOS architecture • Some code specifics • Some iOS client-server tips • NOT how to write an iOS app - NO UITableView, etc iOS for ERREST
- 3. App Store • Huddle • b-london • iWycombe • SOE Status • Comet • Mobile Adventure Walks
- 4. Enterprise • DeLaRue • Oetker • Dorchester • LifeFitness • BidPresentation x 5
- 5. WebObjects • Powerful system for server based development • ERREST for RESTful servers • Historically has used browsers for clients
- 6. Problem?
- 7. The Client • HTML • BUT <table>, Browser Wars, CSS • Java Client • BUT - Java - in the client • Javascript/Single Page Applications • BUT Javascript?, what framework?
- 8. The Client • iOS • iPhone for mass distribution • iPad for Enterprise • Objective C • Xcode • Foundation, UIKit
- 9. iOS Statistics (WWDC 2013) • 600 million units sold • iPad has 82% tablet market share • iOS 6 is on 93% of all iOS devices
- 10. Objective C • ARC • properties • blocks • Grand Central Dispatch • Xcode • git • OSS
- 11. • Huddle • SaaS,Windows/IE oriented • Comet * • High street large enterprise, high volume shopping, ERREST • Walks * • “exergaming”, ERREST,Amazon EC2 • SOE Status • game server updates Examples
- 12. Comet Architecture Marketing db Reviews WO db XML Linux, mySQL Change Report Mobile clients
- 13. Comet Database Features: skunum, runId; xml/json held as strings Category SKU Review WC7SKU Client
- 14. REST API • category - parent, children • sku • skudetail - contains full review and XML text • brand - attribute of sku
- 15. Code Approaches • CometAPI subclasses PLRestful • per entity subclass (Sku, Category, etc) • NSURLConnection • ASIHTTPRequest (not maintained) • AFNetworking (github) • RESTKit - RestKit.org
- 16. PLRestful.h @class PLRestful; typedef void (^PLRestfulAPICompletionBlock)(PLRestful *api, id object, int status, NSError *error); @interface PLRestful : NSObject @property (nonatomic, copy) NSString *endpoint; @property (nonatomic, copy) PLRestfulAPICompletionBlock completionBlock; @property (nonatomic, copy) NSString *username; @property (nonatomic, copy) NSString *password; + (NSString *)messageForStatus:(int)status; + (BOOL)checkReachability:(NSURL *)url; + (void)get:(NSString *)requestPath parameters:(NSDictionary *)parameters completionBlock:(PLRestfulAPICompletionBlock)completion; + (void)post:(NSString *)requestPath content:(NSDictionary *)content completionBlock:(PLRestfulAPICompletionBlock)completion; - (void)get:(NSString *)requestPath parameters:(NSDictionary *)parameters completionBlock:(PLRestfulAPICompletionBlock)completion; - (void)post:(NSString *)requestPath content:(NSDictionary *)content completionBlock:(PLRestfulAPICompletionBlock)completion; @end
- 17. [skudetail viewDidLoad]; NSString *query = [NSString stringWithFormat:@"skudetail/%@.json", [sku valueForKey:@"skuNum"]]; [CometAPI get:query parameters:nil completionBlock:^(CometAPI *api, id object, int status, NSError *error) { if (error) { [PRPAlertView showWithTitle:@"Error" message:@"Unable to fetch product details" buttonTitle:@"Continue"]; } else { self.sku = object; [self.tableView reloadData]; } }];
- 18. CometAPI get - (void)get:(NSString *)requestString parameters:(NSDictionary *)parameters completionBlock:(CometAPICompletionBlock)completion { NSURL *requestURL = [[NSURL URLWithString:endpoint] urlByAddingPath:requestString andParameters:parameters]; NSLog(@"get: '%@'", [requestURL absoluteString]); NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:requestURL]; if (userName && password && useBasicAuthentication) { NSString *authString = [[NSString stringWithFormat:@"%@:%@", userName, password] base64]; NSString *authHeader = [NSString stringWithFormat:@"Basic %@", authString]; [request setValue:authHeader forHTTPHeaderField:@"Authorization"];! ! } //[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; ! [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; ...
- 19. CometAPI get ... self.completionBlock = completion; [[UIApplication sharedApplication] prp_pushNetworkActivity]; self.restQueue = [[NSOperationQueue alloc] init]; self.restQueue.name = @"Comet REST Queue"; [NSURLConnection sendAsynchronousRequest:request queue:self.restQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ if (error) { NSLog(@"%s %@", __PRETTY_FUNCTION__, error); [self callCompletionBlockWithObject:nil error:error]; } else { if ([data length] == 0) { NSLog(@"no data"); [self callCompletionBlockWithObject:nil error:[NSError errorWithDomain:@"com.plsys.semaphore.CometAPI" code:1001 userInfo:nil]]; } else { NSError *error; id object = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; if (object) { [self callCompletionBlockWithObject:object error:nil]; } else { NSLog(@"received bad json: (%d) '%@'", [data length], [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); [self callCompletionBlockWithObject:nil error:[NSError errorWithDomain:@"com.plsys.semaphore.CometAPI" code:1002 userInfo:nil]]; } } } }]; }
- 20. CometAPI Methods - (void)callCompletionBlockWithObject:(id)object error:(NSError *)error { dispatch_async(dispatch_get_main_queue(), ^{ [[UIApplication sharedApplication] prp_popNetworkActivity]; self.completionBlock(self, object, error); }); }
- 21. CometAPI Methods - (NSURL *)urlByAddingPath:(NSString *)path andParameters:(NSDictionary *)parameters; { NSString *requestString = [[self absoluteString] stringByAppendingPathComponent:path]; if (parameters) { requestString = [requestString stringByAppendingString:@"?"]; BOOL first = YES; for (NSString *key in [parameters allKeys]) { if (!first) { requestString = [requestString stringByAppendingString:@"&"]; } requestString = [requestString stringByAppendingString:[NSString stringWithFormat:@"%@=%@", key, [[[parameters objectForKey:key] description] stringByAddingPercentEscapesUsingEncoding:kCFStringEncodingUTF8]]]; first = NO; } } return [NSURL URLWithString:requestString]; }
- 22. Traps • Connection reliability • isn’t really “always on” • Data cacheing • performance? • capacity? • Update cacheing • Reachability
- 23. Write more apps!