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Posted 25 Jan 2013

Event traffic calming

, 26 Jan 2013
How to build an object to calm down event traffic.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;

using NLipsum.Core;

namespace SampleDomain
	public class OrderRepository : IOrderRepository
		private const int Capacity = 100;
		private const int RemoveWhenFull = 50;

		private readonly Random _randomPause = new Random();
		private readonly List<Order> _orders = new List<Order>();
		private readonly LipsumGenerator _lipsum = new LipsumGenerator(Lipsums.LoremIpsum, false);

		private bool _generating;

		public void StartGenerating()
			_generating = true;

			Action generateAsynchronously = () => GenerateOrders();
			generateAsynchronously.BeginInvoke(null, null);

		private void GenerateOrders()
			while (_generating) {
				var order = GenerateOrder();


		private Order GenerateOrder()
			return new Order {
				CreatedAt = DateTime.Now,
				Title = _lipsum.GenerateSentences(1)[0]

		private void PutOrderIn(Order order)
			if (_orders.Count == Capacity)


		private void RemoveFromFront()
			_orders.RemoveRange(0, RemoveWhenFull);

		private void SleepRandomTime()
			var time = _randomPause.Next(0, 10);

		public void StopGenerating()
			_generating = false;

		public IEnumerable<Order> ListFrom(DateTime startDate)
			return _orders.Where(x => x.CreatedAt >= startDate);

		public event EventHandler OrderArrived;

		private void OnOrderArrived(EventArgs e)
			if (OrderArrived != null)
				OrderArrived(this, e);

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About the Author

Erich Ledesma
Architect SunHotels
Spain Spain
I Received a Bachelor's Degree in Computer Science at the Mathematics and Computer Science Faculty, University of Havana, Cuba.

I mainly work in web applications using C# and some Javascript. Some very few times do some Java.

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