Video App OnlineStatus Class

#import "OnlineStatus.h"
#import "AFNetworkReachabilityManager.h"


@implementation OnlineStatus {
    bool _connected;
    NSMutableArray *_subscribers;
}

+ (id)sharedInstance {
    static OnlineStatus *instance = nil;
    @synchronized (self) {
        if(instance == nil) {
            instance = [[self alloc] init];
        }
    }
    return instance;
}

-(id)init {
    self = [super init];
    if(self) {
        _subscribers = [NSMutableArray new];

        [self setup];

        NSString *status = _connected ? @"Yes" : @"No";
        NSLog(@"OnlineStatus Listener initialized. Online: %@", status);
    }
    return self;
}

- (void)setup {
    [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        [self handleOnlineStatusChanged:status];
    }];
        [[AFNetworkReachabilityManager sharedManager] startMonitoring];

    _connected = [AFNetworkReachabilityManager sharedManager].reachable;
}

- (bool)isOnline {
    return _connected;
}

+ (bool)isOnline {
    return [[self sharedInstance] isOnline];
}

- (void)handleOnlineStatusChanged:(AFNetworkReachabilityStatus)status {
    bool oldStatus = _connected;
    switch (status) {
        case AFNetworkReachabilityStatusNotReachable:
            NSLog(@"OnlineStatus: No Internet Connection");
            _connected = NO;
            break;
        case AFNetworkReachabilityStatusReachableViaWiFi:
            NSLog(@"OnlineStatus: WIFI");

            _connected = YES;
            break;
        case AFNetworkReachabilityStatusReachableViaWWAN:
            NSLog(@"OnlineStatus: 3G");
            _connected = YES;
            break;
        default:
            NSLog(@"OnlineStatus: Unkown network status");
            _connected = NO;
            break;
    }

    if(oldStatus != _connected) {
        for(id<OnlineStatusSubscriber> subscriber in _subscribers) {
            [subscriber onlineStatus:self statusChangedTo:_connected];
        }
    }
}

- (void)subscribe:(id<OnlineStatusSubscriber>)subscriber {
    [_subscribers addObject:subscriber];
}

- (void)unsubscribe:(id<OnlineStatusSubscriber>)subscriber {
    [_subscribers removeObject:subscriber];
}

@end