RabbitMQ集群用例没有HA(RabbitMQ clustering use case w/o HA)

 使用单例类，我总是将它们用于需要从应用程序内部的任何位置访问的全局数据管理器类。 您可以创建一个这样的简单： 
 
@interface NewsArchiveManager : NetworkDataManager
{
}

+ (NewsArchiveManager *) sharedInstance;
@end

@implementation NewsArchiveManager

- (id) init
{
    self = [super init];
    if ( self ) 
    {
         // custom initialization goes here
    }

    return self;
}


+ (NewsArchiveManager *) sharedInstance
{
    static NewsArchiveManager *g_instance = nil;

    if ( g_instance == nil )
    {
        g_instance = [[self alloc] init];
    }

    return g_instance;
}


- (void) dealloc
{
    [super dealloc];
}

@end

Use a singleton class, I use them all the time for global data manager classes that need to be accessible from anywhere inside the application. You can create a simple one like this:
 
@interface NewsArchiveManager : NetworkDataManager
{
}

+ (NewsArchiveManager *) sharedInstance;
@end

@implementation NewsArchiveManager

- (id) init
{
    self = [super init];
    if ( self ) 
    {
         // custom initialization goes here
    }

    return self;
}


+ (NewsArchiveManager *) sharedInstance
{
    static NewsArchiveManager *g_instance = nil;

    if ( g_instance == nil )
    {
        g_instance = [[self alloc] init];
    }

    return g_instance;
}


- (void) dealloc
{
    [super dealloc];
}

@end