在同一套接字连接中发送多个HL7消息

Question

在询问之前我搜索了此问题，但找不到类似的东西。 我开发了一个客户端/服务器解决方案来发送/接收HL7消息。 我正在使用套接字将客户端连接到服务器，并且通过此连接，我只能使用OutputSteam对象发送1条HL7消息。 如何在同一套接字连接中发送多个HL7？ 我尝试了不同的方法，但是它们无法正常工作。

这是我的客户端代码：

//Create socket that is connected to server on specified port
        System.out.println("Connecting to Server....");
        Socket socket  = new Socket(ipServer, serverPort);
        System.out.println("Connected to Server");

        StringBuffer HL7Message1 = new StringBuffer();

        //Message 1
        HL7Message1
        .append(START_BLOCK)
        .append("MSH|^~\\&|NES|NINTENDO|TESTSYSTEM|TESTFACILITY|20010101000000||ADT^A04|Q000000000000000001|P|2.3")
        .append(CARRIAGE_RETURN)
        .append("EVN|A04|20010101000000|||^KOOPA^BOWSER^^^^^^^CURRENT")
        .append(CARRIAGE_RETURN)
        .append("PID|1||123456789|0123456789^AA^^JP|BROS^MARIO^HELLO^WORLD^ONE^||19850101000000|M|||123 FAKE STREET^MARIO \\T\\ LUIGI BROS PLACE^TOADSTOOL KINGDOM^NES^A1B2C3^JP^HOME^^1234|1234|(555)555-0123^HOME^JP:1234567|||S|MSH|12345678|||||||0|||||N")
        .append(CARRIAGE_RETURN)
        .append("NK1|1|PEACH^PRINCESS^^^^|SO|ANOTHER CASTLE^^TOADSTOOL KINGDOM^NES^^JP|(123)555-1234|(123)555-2345|NOK|||||||||||||")
        .append(CARRIAGE_RETURN)
        .append("NK1|2|TOADSTOOL^PRINCESS^^^^|SO|YET ANOTHER CASTLE^^TOADSTOOL KINGDOM^NES^^JP|(123)555-3456|(123)555-4567|EMC|||||||||||||")
        .append(CARRIAGE_RETURN)
        .append("PV1|1|O|ABCD^EFGH^|||^^|123456^DINO^YOSHI^^^^^^MSRM^CURRENT^^^NEIGHBOURHOOD DR NBR^|^DOG^DUCKHUNT^^^^^^^CURRENT||CRD|||||||123456^DINO^YOSHI^^^^^^MSRM^CURRENT^^^NEIGHBOURHOOD DR NBR^|AO|0123456789|1|||||||||||||||||||MSH||A|||20010101000000"
                )
        .append(CARRIAGE_RETURN)
        .append("IN1|1|PAR^PARENT||||LUIGI")
        .append(CARRIAGE_RETURN)
        .append("IN1|2|FRI^FRIEND||||PRINCESS")
        .append(CARRIAGE_RETURN)
        .append(END_BLOCK)
        .append(CARRIAGE_RETURN);

        InputStream in = socket.getInputStream();
        OutputStream out = socket.getOutputStream();

        //Send the MLLP-wrapped HL7 message to the server
        out.write(HL7Message1.toString().getBytes());

        byte[] byteBuffer =  new byte[200];
        in.read(byteBuffer);
        System.out.println("Received from Server: " + new String(byteBuffer));

从服务器端

public String getMessage(InputStream anInputStream) throws IOException  {

            boolean end_of_message = false;
            StringBuffer parsedMessage = new StringBuffer();

            int characterReceived = 0;

            try {
                characterReceived = anInputStream.read();
            } catch (SocketException e) {
                System.out
                .println("Unable to read from socket stream. "
                        + "Connection may have been closed: " + e.getMessage());
                return null;
            }

            if (characterReceived == END_OF_TRANSMISSION) {
                return null;
            }

            if (characterReceived != START_OF_BLOCK) {
                throw new RuntimeException(
                        "Start of block character has not been received");
            }

            while (!end_of_message) {
                characterReceived = anInputStream.read();

                if (characterReceived == END_OF_TRANSMISSION) {
                    throw new RuntimeException(
                            "Message terminated without end of message character");
                }

                if (characterReceived == END_OF_BLOCK) {
                    characterReceived = anInputStream.read();

                    if (characterReceived != CARRIAGE_RETURN) {
                        throw new RuntimeException(
                                "End of message character must be followed by a carriage return character");
                    }
                    end_of_message = true;
                } else {
                    parsedMessage.append((char) characterReceived);
                }
            }

如何在同一套接字连接中发送更多HL7消息？

Answer 1

您真正想要做的就是将套接字与数据分开。 我建议使用像这样的TCP客户端服务器来管理套接字。 然后，您只需向您的客户写一条消息。 我有一项服务可以为我做这件事。 基本上，我打包了HL7的任何字符串，看起来好像您已经知道该怎么做，然后调用TCP Server的Send方法。

我的看起来像这样，但是我认为链接中的那个看起来像：

public int Send(string data)
{
    TcpClient sender = new TcpClient();
    IPEndPoint localEP = new IPEndPoint(IPAddress.Any, Port);
    try
        {
            TcpServerConnection cn;

            if (connections.Count == 0)
            {
                //if there are no connections then we end up here.
                ConnectSocket(sender, localEP);
            }

            cn = connections[0];

            if (cn.Socket.Connected && cn.verifyConnected())
            {
                cn.sendData(data);
                return connections.Count;
            }
            cn.Socket.Close();

            ConnectSocket(sender, localEP);
            if (cn.Socket.Connected && cn.verifyConnected())
            {
                cn.sendData(data);
                return connections.Count;
            }
            cn.Socket.Close();
            return -1;
        }
        catch (Exception e)
        {                   
        }
    }

正如您所看到的那样，重要的部分是TCP Server确定是否有可用的套接字，并在必要时打开一个套接字。 然后它将数据向下发送。 我认为，如果不将HL7消息传递中的TCP传输/编码分开，将会遇到很多困难。 如果要等待MLLP第2版的ACK，我个人将ACK中的出站消息ID和返回消息ID进行比较，并进行比较：

if (lastOutMessageID == lastOutAckID || lastOutMessageID == "")
{
    lastOutMessageID = SendNextHL7Message;
}

然后，我监听ACK，并对传入的数据引发一个事件：

void _contractManager_OnAckReceived(string msgID, string ackStatus)
{
    lastOutAckID = msgID;
    lastOutStatus = ackStatus;
    lastAckTime = DateTime.Now;
    outRetries = 0;
    DoNextHL7();
}

但是简短的版本是在它们自己的类中管理传输和套接字，并且只是从中发送和等待数据。