[英]Stopping an asynchronous TCP server on separate thread in C#
I have implemented an asynchronous TCP server that is spawned by another process. 我已经实现了由另一个进程生成的异步TCP服务器。 It starts fine and operates as expected, however I am having trouble terminating the server when I end the process that started it.
它开始正常并按预期运行,但是当我结束启动它的进程时,我无法终止服务器。
The following is my current TCP server and stopping function from the other process. 以下是我当前的TCP服务器和其他进程的停止功能。
TCP Server TCP服务器
public class StateObject
{
//Client socket.
public Socket workSocket = null;
//Size of receive buffer.
public const int BufferSize = 1024;
//Receive buffer.
public byte[] buffer = new byte[BufferSize];
//Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousSocketListener : Strategy
{
//Thread signal.
public static ManualResetEvent allDone = new ManualResetEvent(false);
public volatile bool listening = true;
//User-specified port number.
private int Port;
public AsynchronousSocketListener(int port)
{
Port = port;
}
public void StopListening()
{
listening = false;
}
public void StartListening()
{
//Data buffer for incoming data.
byte[] bytes = new Byte[1024];
//Establish the local endpoint for the socket.
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, Port);
//Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
//Bind the socket to the local endpoint and listen for
//incoming connections.
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
while (listening)
{
//Set the event to nonsignaled state.
allDone.Reset();
//Start an asychronous socket to listen for connections.
Print("Waiting for a connection...");
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
//Wait until a connection is made before continuing.
allDone.WaitOne();
}
}
catch (Exception e)
{
Print(e.ToString());
}
}
public void AcceptCallback(IAsyncResult arg)
{
//Signal the main thread to continue.
allDone.Set();
//Get the socket that handles the client request.
Socket listener = (Socket) arg.AsyncState;
Socket handler = listener.EndAccept(arg);
//Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
public void ReadCallback(IAsyncResult arg)
{
String content = String.Empty;
//Retrieve the state object and the handler socket
//from the asynchronous state object.
StateObject state = (StateObject) arg.AsyncState;
Socket handler = state.workSocket;
//Read data from the client socket.
int bytesRead = handler.EndReceive(arg);
if (bytesRead > 0)
{
//There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(
state.buffer,0,bytesRead));
//Check for end-of-file tag. If it is not there, read
//more data.
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
//All the data has been read from the
//client. Display it on the console.
Print("Read " + content.Length + " bytes from socket. \n Data : " + content);
//Echo the data back to the client.
Send(handler, content);
}
else
{
//Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
}
}
private void Send(Socket handler, String data)
{
//Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
//Begin sending the data to the remote device.
handler.BeginSend(byteData,0,byteData.Length,0,
new AsyncCallback(SendCallback),handler);
}
private void SendCallback(IAsyncResult arg)
{
try
{
//Retrieve the socket from the state object.
Socket handler = (Socket) arg.AsyncState;
//Complete sending the data to the remote device.
int bytesSent = handler.EndSend(arg);
Print("Sent " + bytesSent + " bytes to client.");
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception e)
{
Print(e.ToString());
}
}
}
Spawning process 产卵过程
//private NinjaTerminal.Server server;
private NinjaTerminal.AsynchronousSocketListener server;
private Thread listenThread;
private int _Port = 8080;
protected override void OnStartUp()
{
server = new NinjaTerminal.AsynchronousSocketListener(Port);
listenThread = new Thread(new ThreadStart(server.StartListening));
listenThread.Start();
}
protected override void OnTermination()
{
listenThread.stopListening();
listenThread.Join();
}
Now I've verified that OnTermination() gets called, and it does join to the server thread, however the server thread never ends. 现在我已经验证了OnTermination()被调用,并且它确实连接到服务器线程,但是服务器线程永远不会结束。
I would love some insights as to why, and suggestions to a better architecture or more than welcome. 我会喜欢一些关于为什么的见解,以及对更好的建筑或更多欢迎的建议。 At this stage I haven't invested much into anything but setting up the TCP server, so if you have a different/better idea I'd love to hear it.
在这个阶段,除了设置TCP服务器之外,我没有投入太多资金,所以如果你有不同/更好的想法,我很乐意听到它。
Also, I've searched high and low through StackOverflow for an answer already and none of them really applied to an asynchronous TCP server. 此外,我已经通过StackOverflow搜索了高低,以获得答案,并且它们都没有真正应用于异步TCP服务器。 And I'm using .NET 3.5
我正在使用.NET 3.5
Code addition to Reed's answer 代码添加到里德的答案
public void StopListening() { listening = false; public void StopListening(){listening = false; allDone.Set();
allDone.Set(); }
}
public void StartListening()
{
//Data buffer for incoming data.
byte[] bytes = new Byte[1024];
//Establish the local endpoint for the socket.
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, Port);
//Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
//Bind the socket to the local endpoint and listen for
//incoming connections.
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
while (listening)
{
//Set the event to nonsignaled state.
allDone.Reset();
//Start an asychronous socket to listen for connections.
Print("Waiting for a connection...");
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
//Wait until a connection is made before continuing.
allDone.WaitOne();
}
listener.Close();
}
catch (Exception e)
{
Print(e.ToString());
}
}
You need to change StopListening
to also include a call to signal your WaitHandle: 您需要更改
StopListening
以包含一个调用WaitHandle的信号:
public void StopListening()
{
this.listening = false;
this.allDone.Set();
}
Without this, your StartListening
routine will hang forever here: 如果没有这个,您的
StartListening
例程将永远挂起:
//Wait until a connection is made before continuing.
allDone.WaitOne();
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