How to resolve the algorithm Echo server step by step in the C# programming language

Published on 12 May 2024 09:40 PM
#C_Sharp

How to resolve the algorithm Echo server step by step in the C# programming language

Table of Contents

Problem Statement

Create a network service that sits on TCP port 12321, which accepts connections on that port, and which echoes complete lines (using a carriage-return/line-feed sequence as line separator) back to clients. No error handling is required. For the purposes of testing, it is only necessary to support connections from localhost (127.0.0.1 or perhaps ::1). Logging of connection information to standard output is recommended. The implementation must be able to handle simultaneous connections from multiple clients. A multi-threaded or multi-process solution may be used. Each connection must be able to echo more than a single line. The implementation must not stop responding to other clients if one client sends a partial line or stops reading responses.

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Step by Step solution about How to resolve the algorithm Echo server step by step in the C# programming language

The given source code is a C# program that implements a simple TCP server that listens for incoming connections on a specified port and then creates a new thread to handle each client connection.

The program starts by creating a new TcpListener object and specifying the IP address and port number to listen on. It then creates a new thread to start the listening process.

The DoListen method is the entry point for the listening thread. It starts the TcpListener and waits for incoming connections. When a connection is received, the AcceptTcpClient method is called to create a new TcpClient object for the connection. A new thread is then created to handle the client connection.

The DoClient method is the entry point for the client handling thread. It reads data from the client and then resends it back to the client. The thread continues to read and resend data until the client disconnects.

The program uses the following classes and methods from the System.Net.Sockets namespace:

  • TcpListener: Represents a listener for incoming TCP connections.
  • TcpClient: Represents a TCP client connection.
  • AcceptTcpClient: Accepts a pending TCP connection request.
  • GetStream: Gets a stream for reading and writing data.
  • ReadByte: Reads a byte from the stream.
  • WriteByte: Writes a byte to the stream.

The program also uses the Thread class from the System.Threading namespace to create threads for handling client connections.

Source code in the csharp programming language

using System.Net.Sockets;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static TcpListener listen;
        static Thread serverthread;

        static void Main(string[] args)
        {
            listen = new TcpListener(System.Net.IPAddress.Parse("127.0.0.1"), 12321);
            serverthread = new Thread(new ThreadStart(DoListen));
            serverthread.Start();
        }

        private static void DoListen()
        {
            // Listen
            listen.Start();
            Console.WriteLine("Server: Started server");

            while (true)
            {
                Console.WriteLine("Server: Waiting...");
                TcpClient client = listen.AcceptTcpClient();
                Console.WriteLine("Server: Waited");

                // New thread with client
                Thread clientThread = new Thread(new ParameterizedThreadStart(DoClient));
                clientThread.Start(client);
            }
        }

        private static void DoClient(object client)
        {
            // Read data
            TcpClient tClient = (TcpClient)client;

            Console.WriteLine("Client (Thread: {0}): Connected!", Thread.CurrentThread.ManagedThreadId);
            do
            {
                if (!tClient.Connected)
                { 
                    tClient.Close();
                    Thread.CurrentThread.Abort();       // Kill thread.
                }

                if (tClient.Available > 0)
                {
                    // Resend
                    byte pByte = (byte)tClient.GetStream().ReadByte();
                    Console.WriteLine("Client (Thread: {0}): Data {1}", Thread.CurrentThread.ManagedThreadId, pByte);
                    tClient.GetStream().WriteByte(pByte);
                }

                // Pause
                Thread.Sleep(100);
            } while (true);
        }
    }
}

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