RabbitMQ-基于RPC实现

对于使用RabbitMQ执行Command的情况，有时候需要有返回值信息。此时相当于client发布一个command后，并侦听返回结果的queue，server接收并处理，将处理结果发布到client侦听的queue中。简单实现如下：

1. Client端

private static void RPCResponse()
{
    using (IConnection conn = CreateMQConnection())
    {
        using (IModel ch = conn.CreateModel())
        {
            while (true)
            {
                BasicGetResult res = ch.BasicGet("q1", false/*noAck*/);
                if (res != null)
                {
                    try
                    {
                        string message = UTF8Encoding.UTF8.GetString(res.Body);
                        ch.BasicAck(res.DeliveryTag, false);

                        //返回数据
                        ch.ExchangeDeclare("e2", ExchangeType.Direct);
                        ch.QueueDeclare("q2", true, false, false, null);
                        ch.QueueBind("q2", "e2", "r2");

                        ch.BasicPublish("e2", "r2", null, Encoding.UTF8.GetBytes(message));//发布返回结果到q2中
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.ToString());
                    }
                }
            }
        }
    }
}

2. Server端

public static void SendCommand_Direct()
{
    while (true)
    {
        JObject joMessage = new JObject();
        joMessage.Add("to", "all");
        joMessage.Add("from", "zsw");
        joMessage.Add("message", "hello everyone!");
        joMessage.Add("type", "Direct");
        joMessage.Add("time", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));

        JObject jo = new JObject();
        jo.Add("command", "chat");
        jo.Add("data", JsonHelper.GetClearString(joMessage));

        string message = JsonHelper.GetClearString(jo);

        string _requestExchange = "e1";
        string route = "r1";
        string queue = "q1";

        try
        {
            using (IConnection connection = CreateMQConnection())
            {
                using (IModel channel = connection.CreateModel())
                {
                    channel.ExchangeDeclare(_requestExchange, ExchangeType.Direct);
                    channel.QueueDeclare(queue, true, false, false, null);
                    channel.QueueBind(queue, _requestExchange, route);

                    channel.BasicPublish(_requestExchange, route, null, Encoding.UTF8.GetBytes(message));
                    Console.WriteLine(string.Format("Direct publish message:{0}", message));

                    BasicGetResult res = channel.BasicGet("q2", false/*noAck*/);//从q2中获取返回结果
                    if (res != null)
                    {
                        try
                        {
                            string rpcMessage = UTF8Encoding.UTF8.GetString(res.Body);
                            Console.WriteLine("rpc:" + rpcMessage);
                            channel.BasicAck(res.DeliveryTag, false);
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine(ex.ToString());
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }

        Thread.Sleep(3000);
    }
}