IRedisSubscription连接

Question

我正在使用服务堆栈连接到Redis并使用SubPub功能。

我应该保持IRedisSubscription和IRedisClient实例化还活着吗？例如，我应该将它分配给类级变量吗？

或者我可以简单地将其范围放在using语句中，服务栈将处理持久性吗？

即，以下哪个例子是正确的：

  

公共类RedisPubSub1：IDisposable {

    private static PooledRedisClientManager ClientPool = new PooledRedisClientManager("connectionString");
    private IRedisSubscription _subscription;
    private IRedisClient _client;

    private Action<string, string> _publish;
    public event Action<string, string> Publish {
        add { _publish += value; }
        remove { _publish -= value; }
    }

    public RedisPubSub1()
    {         
        Task.Factory.StartNew(() =>
            {
                _client = ClientPool.GetClient();
                _subscription = _client.CreateSubscription();
                    {
                        _subscription.OnMessage = EnqueEvent;
                        _subscription.SubscribeToChannels(new string[] { Channel });
                    }
        });
    }

    private void EnqueEvent(string channel, string message)
    {
        if (_publish!= null)
            _publish(channel, message);
    }      

    public void Dispose()
    {
        _subscription.Dispose();
        _client.Dispose();


    }
} }

或

  

公共类RedisPubSub2 {

    private static PooledRedisClientManager ClientPool = new PooledRedisClientManager("connectionString");

    private Action<string, string> _publish;

    public event Action<string, string> Publish {
        add { _publish += value; }
        remove { _publish -= value; }
    }

    public RedisPubSub2()
    {         
        Task.Factory.StartNew(() =>
            {
                using(var _client = ClientPool.GetClient())
                {
                    using(_subscription = _client.CreateSubscription()
                    {
                        _subscription.OnMessage = EnqueEvent;
                        _subscription.SubscribeToChannels(new string[] { Channel });
                    }
                }
        });
    }

    private void EnqueEvent(string channel, string message)
    {
        if (_publish!= null)
            _publish(channel, message);
    }       }

Answer 1

SubscribeToChannels是阻塞的，所以如果你保留对连接的引用并不重要，因为它不会处理，除非你结束订阅（即取消订阅）。

建议您在需要时以某种方式取消订阅订阅，您可以使用RedisMqServer example中所示的持有活动订阅的主题进行操作，例如：

using (var subscription = redisClient.CreateSubscription())
{
    subscription.OnUnSubscribe = channel => 
       Log.Debug("OnUnSubscribe: " + channel);

    subscription.OnMessage = (channel, msg) =>
    {
        if (msg == "STOP")
        {
            Log.Debug("UnSubscribe From All Channels...");
            subscription.UnSubscribeFromAllChannels(); //Un block thread.
            return;
        }

        handleMessage(msg);
    }   

    ...

    //Unsubscribing will unblock this subscription:
    subscription.SubscribeToChannels(QueueNames.TopicIn); //blocks thread
}