c# - 在不删除的情况下读取 ActiveMQ 消息

Question

我正在尝试通读 ActiveMQ 消息并根据一些过滤器来处理其中一些消息或将其他消息留在队列中。我将 NMS API 与以下代码结合使用:

        Uri connecturi = new Uri("activemq:tcp://model.net:61616");
        IConnectionFactory factory = new NMSConnectionFactory(connecturi);
        List<ModelBuilderBase> result = new List<ModelBuilderBase>();
        using (IConnection connection = factory.CreateConnection())
        using (ISession session = connection.CreateSession())
        {
            IDestination destination = SessionUtil.GetDestination(session, "queue://cidModelbuilderQ");
            using (IMessageConsumer consumer = session.CreateConsumer(destination))
            {
                connection.Start();
                ITextMessage message;
                while ((message = consumer.ReceiveNoWait() as ITextMessage) != null)
                {
                    if (message.Properties[MANDATOR] == null || message.Properties[REFCODE] == null)
                        continue;
                    var mandator = message.Properties[MANDATOR].ToString();
                    var refCode = message.Properties[REFCODE].ToString();
                    result.Add(ModelBuilderFactory.Instance.GetInstance(refCode, mandator));
                }
            }

问题是在收到消息后，消息被删除了。我能否以某种方式更改此行为并在成功处理后仅手动删除消息？

Answer 1

虽然为此编写工作代码并不容易，但多亏了 ARS 的回答，我现在有了这个工作解决方案:

        Uri connecturi = new Uri("activemq:tcp://model.net:61616");
        IConnectionFactory factory = new NMSConnectionFactory(connecturi);
        List<ModelBuilderBase> result = new List<ModelBuilderBase>();
        using (IConnection connection = factory.CreateConnection())
        using (ISession session = connection.CreateSession())
        {

            IDestination destination = SessionUtil.GetDestination(session, "queue://cidModelbuilderQ");
            using (IMessageConsumer consumer = session.CreateConsumer(destination))
            {
                connection.Start();
                var q = session.GetQueue("cidModelbuilderQ");
                var b = session.CreateBrowser(q);
                var msgs = b.GetEnumerator();
                while (msgs.MoveNext())
                {
                    ITextMessage message = msgs.Current as ITextMessage;
                    if (message.Properties[MANDATOR] == null || message.Properties[REFCODE] == null)
                        continue;
                    var mandator = message.Properties[MANDATOR].ToString();
                    var refCode = message.Properties[REFCODE].ToString();
                    result.Add(ModelBuilderFactory.Instance.GetInstance(refCode, mandator));
                }
            }
        }