RabbitMQ異常案例數據

Question

我是RabbitMQ的新手，正在做首次申請。 但是我對異常情況有些困惑。 例如，我從隊列中收到一條消息。 並且在將數據保存到數據庫時發生錯誤。 數據將會丟失。 這個問題的解決辦法是什么？

        var factory = new ConnectionFactory { HostName = "10.1.2.34" };

        using (var connection = factory.CreateConnection())
        {
            using (var channel = connection.CreateModel())
            {
                channel.QueueDeclare(queue: "business.orders", durable: false, exclusive: false, autoDelete: false, arguments: null);

                var data = channel.BasicGet(queue: "business.orders", noAck: true);

                using (var stream = new MemoryStream(data.Body))
                {
                    var order = (PlaceOrder)new BinaryFormatter().Deserialize(stream);

                    // Throw exception. ????
                }
            }
        }

Answer 1

您必須使用手動ack ：

var data = channel.BasicGet(queue: "business.orders", noAck: false);

如果沒有錯誤，請插入數據庫：

channel.BasicAck(result.DeliveryTag, false);

請在這里閱讀： https : //www.rabbitmq.com/dotnet-api-guide.html

bool noAck = false;
BasicGetResult result = channel.BasicGet(queueName, noAck);
if (result == null) {
    // No message available at this time.
} else {
    IBasicProperties props = result.BasicProperties;
    byte[] body = result.Body;
    ...
Since noAck = false above, you must also call IModel.BasicAck to acknowledge that you have successfully received and processed the message:
    ...
    // acknowledge receipt of the message
    channel.BasicAck(result.DeliveryTag, false);
}

順便說一句，我建議也閱讀： https : //www.rabbitmq.com/dotnet-api-guide.html部分：

通過訂閱檢索消息（“推送API”）

basicGet對EventingBasicConsumer速度較慢