Question

我试图创建一个rpc程序来与位于不同网络的主机进行通信，并选择此处提供的NetMQ的路由器 - 经销商配置：http://netmq.readthedocs.io/en/latest/router-dealer/#router-dealer

但问题是路由器总是在将消息路由到后端时选择随机经销商。我使用的代码：

using (var frontend = new RouterSocket(string.Format("@tcp://{0}:{1}", "127.0.0.1", "5556")))//"@tcp://10.0.2.218:5559"
                using (var backend = new DealerSocket(string.Format("@tcp://{0}:{1}", "127.0.0.1", "5557")))//"@tcp://10.0.2.218:5560"
                {
                    // Handler for messages coming in to the frontend
                    frontend.ReceiveReady += (s, e) =>
                    {
                        Console.WriteLine("message arrived on frontEnd");                            
                        NetMQMessage msg = e.Socket.ReceiveMultipartMessage();
                        string clientAddress = msg[0].ConvertToString();                            
                        Console.WriteLine("Sending to :" + clientAddress);
                        //TODO: Make routing here
                        backend.SendMultipartMessage(msg); // Relay this message to the backend                        };

                    // Handler for messages coming in to the backend
                    backend.ReceiveReady += (s, e) =>
                    {
                        Console.WriteLine("message arrived on backend");
                        var msg = e.Socket.ReceiveMultipartMessage();

                        frontend.SendMultipartMessage(msg); // Relay this message to the frontend
                    };

                    using (var poller = new NetMQPoller { backend, frontend })
                    {
                        // Listen out for events on both sockets and raise events when messages come in
                        poller.Run();
                    }
                }

客户代码：

using (var client = new RequestSocket(">tcp://" + "127.0.0.1" + ":5556"))
        {
            var messageBytes = UTF8Encoding.UTF8.GetBytes("Hello");
            var messageToServer = new NetMQMessage();
            //messageToServer.AppendEmptyFrame();
            messageToServer.Append("Server2");
            messageToServer.Append(messageBytes);
            WriteToConsoleVoid("======================================");
            WriteToConsoleVoid(" OUTGOING MESSAGE TO SERVER ");
            WriteToConsoleVoid("======================================");
            //PrintFrames("Client Sending", messageToServer);
            client.SendMultipartMessage(messageToServer);

            NetMQMessage serverMessage = client.ReceiveMultipartMessage();
            WriteToConsoleVoid("======================================");
            WriteToConsoleVoid(" INCOMING MESSAGE FROM SERVER");
            WriteToConsoleVoid("======================================");
            //PrintFrames("Server receiving", clientMessage);
            byte[] rpcByteArray = null;
            if (serverMessage.FrameCount == 3)
            {
                var clientAddress = serverMessage[0];
                rpcByteArray = serverMessage[2].ToByteArray();
            }

            WriteToConsoleVoid("======================================");
            Console.ReadLine();
        }

经销商代码：

using (var server = new ResponseSocket())
        {
            server.Options.Identity = UTF8Encoding.UTF8.GetBytes(confItem.ResponseServerID);
            Console.WriteLine("Server ID:" + confItem.ResponseServerID);
            server.Connect(string.Format("tcp://{0}:{1}", "127.0.0.1", "5557"));
            using (var poller = new NetMQPoller { server })
            {
                server.ReceiveReady += (s, a) =>
                    {
                        byte[] response = null;
                        NetMQMessage serverMessage = null;
                        try
                        {
                            serverMessage = a.Socket.ReceiveMultipartMessage();
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine("Exception on ReceiveMultipartMessage : " + ex.ToString());
                            //continue;
                        }
                        byte[] eaBody = null;
                        string clientAddress = "";
                        if (serverMessage.FrameCount == 2)
                        {
                            clientAddress = serverMessage[0].ConvertToString();
                            Console.WriteLine("ClientAddress:" + clientAddress);
                            eaBody = serverMessage[1].ToByteArray();
                            Console.WriteLine("Received message from remote computer: {0} bytes , CurrentID : {1}", eaBody.Length, confItem.ResponseServerID);
                        }
                        else
                        {
                            Console.WriteLine("Received message from remote computer: CurrentID : {0}", confItem.ResponseServerID);
                        }
                    };
                poller.Run();
            }
        }

是否可以在frontend.ReceiveReady上选择特定的后端？谢谢！

Answer 1

你的后端也应该是路由器。您需要工作人员进行注册，或者您需要了解所有可用的工作人员及其身份。当在后端发送时，在服务器的开头推送工作者身份。

查看zeromq指南中的Majordomo示例：

http://zguide.zeromq.org/page:all#toc72 http://zguide.zeromq.org/page:all#toc98

NetMQ客户端到客户端消息传递

1 个答案: