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using System;
using System.Collections.Generic;
using System.Linq;
namespace Kaleida.ServiceMonitor.Model.Runtime
{
public abstract class OperationOrder
{
public static readonly OperationOrder Random = new RandomOrder();
public static readonly OperationOrder RoundRobin = new RoundRobinOrder();
public abstract T SelectItem<T>(IList<T> items);
public abstract string Name { get; }
}
public class RandomOrder : OperationOrder
{
private readonly Random random = new Random();
public override T SelectItem<T>(IList<T> items)
{
if(!items.Any())
throw new InvalidOperationException("Cannot select item. List has no items");
var index = random.Next(items.Count());
return items[index];
}
public override string Name
{
get { return "Random"; }
}
}
public class RoundRobinOrder : OperationOrder
{
private int currentOperationIndex;
public override T SelectItem<T>(IList<T> items)
{
if (!items.Any())
throw new InvalidOperationException("Cannot select item. List has no items");
currentOperationIndex = (currentOperationIndex < items.Count() - 1) ? currentOperationIndex + 1 : 0;
return items[currentOperationIndex];
}
public override string Name
{
get { return "Round-Robin"; }
}
}
}
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Stuart Wheelwright is the Principal Architect and Software Developer at
BlackJet Software Ltd.
He has over 16 years commercial experience producing robust, maintainable, web-based solutions and bespoke systems for Microsoft platforms.
His latest project is
Shopping UK, an elegantly simple shopping list for iPhone.