@interface SessionManager : AFHTTPSessionManager

+ (id)sharedManager;

@end

static NSString *const kBaseURL = @"https://myapi.com";

@implementation SessionManager

- (id)init {
    self = [super initWithBaseURL:[NSURL URLWithString:kBaseURL]];
    if(!self) return nil;

    self.responseSerializer = [AFJSONResponseSerializer serializer];
    self.requestSerializer = [AFJSONRequestSerializer serializer];

    return self;
}

+ (id)sharedManager {
    static SessionManager *_sessionManager = nil;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sessionManager = [[self alloc] init];
    });

    return _sessionManager;
}

@end

NSArray *restaurants = [[RestaurantManager sharedManager] getRestaurants];

// restaurants contains all the restaurants

NSArray *streets = [[StreetsManager sharedManager] getStreets];

// streets still contains all the restaurants