quoteserver.cs

Professional C# 2nd Edition

using System;
using System.IO;
using System.Threading;
using System.Net.Sockets;
using System.Text;
using System.Collections.Specialized;
using System.Diagnostics;


namespace Wrox.ProCSharp.WinServices
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	public class QuoteServer : System.ComponentModel.Component
	{
		private TcpListener listener;
		private int port;
		private string filename;
		private StringCollection quotes;
		private Random random;
		private System.Diagnostics.PerformanceCounter performanceCounterBytesSentTotal;
		private System.Diagnostics.PerformanceCounter performanceCounterBytesSentPerSec;
		private System.Diagnostics.PerformanceCounter performanceCounterRequestsTotal;
		private System.Diagnostics.PerformanceCounter performanceCounterRequestsPerSec;
		private Thread listenerThread;
		private System.Diagnostics.EventLog eventLog;
		
		private int requestsPerSec;
		private System.Timers.Timer timer;
		private int bytesPerSec;

		public QuoteServer(): this("quotes.txt")
		{
		}
		public QuoteServer(string filename) : this(filename, 7890)
		{
		}
		public QuoteServer(string filename, int port)
		{
			this.filename = filename;
			this.port = port;

			InitializeComponent();
		}



		protected void ReadQuotes()
		{
			quotes = new StringCollection();
			Stream stream = File.OpenRead(filename);
			StreamReader streamReader = new StreamReader(stream);
			string quote;
			while ((quote = streamReader.ReadLine()) != null)
			{
				quotes.Add(quote);
			}
			streamReader.Close();
			stream.Close();
			random = new Random();
		}

		protected string GetRandomQuoteOfTheDay()
		{
			int index = random.Next(0, quotes.Count);
			return quotes[index];
		}

		public void Start()
		{
			ReadQuotes();
			listenerThread = new Thread(
				new ThreadStart(this.Listener));
			listenerThread.Start();
		}

		protected void Listener()
		{
			try
			{
				listener = new TcpListener(port);
				listener.Start(); 
				while (true)
				{
					Socket socket = listener.AcceptSocket();
					string message = GetRandomQuoteOfTheDay();
					UnicodeEncoding encoder = new UnicodeEncoding();
					byte[] buffer = encoder.GetBytes(message);
					socket.Send(buffer, buffer.Length, 0);
					socket.Close();

					performanceCounterRequestsTotal.Increment();
					performanceCounterBytesSentTotal.IncrementBy(buffer.Length);
					requestsPerSec++;
					bytesPerSec += buffer.Length;
				}
			}
			catch (SocketException e)
			{
				string message = "Quote Server Exception in Listener: " + 
					e.Message;
				eventLog.WriteEntry(e.Message, EventLogEntryType.Error);
			}
		}

		public void Stop()
		{
			listener.Stop();
		}
		public void Suspend()
		{
			listenerThread.Suspend();
		}
		public void Resume()
		{
			listenerThread.Resume();
		}

		private void InitializeComponent()
		{
			this.performanceCounterBytesSentTotal = new System.Diagnostics.PerformanceCounter();
			this.performanceCounterBytesSentPerSec = new System.Diagnostics.PerformanceCounter();
			this.performanceCounterRequestsTotal = new System.Diagnostics.PerformanceCounter();
			this.performanceCounterRequestsPerSec = new System.Diagnostics.PerformanceCounter();
			this.eventLog = new System.Diagnostics.EventLog();
			this.timer = new System.Timers.Timer();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterBytesSentTotal)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterBytesSentPerSec)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterRequestsTotal)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterRequestsPerSec)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.eventLog)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.timer)).BeginInit();
			// 
			// performanceCounterBytesSentTotal
			// 
			this.performanceCounterBytesSentTotal.CategoryName = "Quote Service Counts";
			this.performanceCounterBytesSentTotal.CounterName = "# of Bytes sent";
			this.performanceCounterBytesSentTotal.ReadOnly = false;
			// 
			// performanceCounterBytesSentPerSec
			// 
			this.performanceCounterBytesSentPerSec.CategoryName = "Quote Service Counts";
			this.performanceCounterBytesSentPerSec.CounterName = "# of Bytes sent / sec";
			this.performanceCounterBytesSentPerSec.ReadOnly = false;
			// 
			// performanceCounterRequestsTotal
			// 
			this.performanceCounterRequestsTotal.CategoryName = "Quote Service Counts";
			this.performanceCounterRequestsTotal.CounterName = "# of Requests";
			this.performanceCounterRequestsTotal.ReadOnly = false;
			// 
			// performanceCounterRequestsPerSec
			// 
			this.performanceCounterRequestsPerSec.CategoryName = "Quote Service Counts";
			this.performanceCounterRequestsPerSec.CounterName = "# of Requests / sec";
			this.performanceCounterRequestsPerSec.ReadOnly = false;
			// 
			// eventLog
			// 
			this.eventLog.Log = "Application";
			this.eventLog.Source = "QuoteService";
			// 
			// timer
			// 
			this.timer.Enabled = true;
			this.timer.Interval = 1000;
			this.timer.Elapsed += new System.Timers.ElapsedEventHandler(this.OnTimer);
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterBytesSentTotal)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterBytesSentPerSec)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterRequestsTotal)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.performanceCounterRequestsPerSec)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.eventLog)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.timer)).EndInit();

		}

		public void RefreshQuotes()
		{
			ReadQuotes();   
		}

		private void OnTimer(object sender, System.Timers.ElapsedEventArgs e)
		{
			performanceCounterBytesSentPerSec.RawValue = bytesPerSec;
			performanceCounterRequestsPerSec.RawValue = requestsPerSec;
			bytesPerSec = 0;
			requestsPerSec = 0;		
		}



	}
}