/Main/src/Samples/v0.2/PerfCounter/Filters.cs

 1using System;
 2using System.Collections.Generic;
 3using System.Linq;
 4using System.Text;
 5
 6namespace PerfCounterChart
 7{
 8	public class MaxSizeFilter : IFilter<PerformanceInfo>
 9	{
10		TimeSpan length = TimeSpan.FromSeconds(10);
11		public IList<PerformanceInfo> Filter(IList<PerformanceInfo> c)
12		{
13			if (c.Count == 0)
14				return new List<PerformanceInfo>();
15
16			DateTime end = c[c.Count - 1].Time;
17
18			int startIndex = 0;
19			for (int i = 0; i < c.Count; i++)
20			{
21				if (end - c[i].Time <= length)
22				{
23					startIndex = i;
24					break;
25				}
26			}
27
28			List<PerformanceInfo> res = new List<PerformanceInfo>(c.Count - startIndex);
29			for (int i = startIndex; i < c.Count; i++)
30			{
31				res.Add(c[i]);
32			}
33			return res;
34		}
35
36	}
37
38	public class FilterChain : IFilter<PerformanceInfo>
39	{
40		private readonly IFilter<PerformanceInfo>[] filters;
41		public FilterChain(params IFilter<PerformanceInfo>[] filters)
42		{
43			this.filters = filters;
44		}
45
46		#region IFilter<PerformanceInfo> Members
47
48		public IList<PerformanceInfo> Filter(IList<PerformanceInfo> c)
49		{
50			foreach (var filter in filters)
51			{
52				c = filter.Filter(c);
53			}
54			return c;
55		}
56
57		#endregion
58	}
59
60	public class AverageFilter : IFilter<PerformanceInfo>
61	{
62		private int number = 2;
63		public int Number
64		{
65			get { return number; }
66			set { number = value; }
67		}
68
69		public IList<PerformanceInfo> Filter(IList<PerformanceInfo> c)
70		{
71			int num = number - 1;
72			if (c.Count - num <= 0)
73				return c;
74
75			List<PerformanceInfo> res = new List<PerformanceInfo>(c.Count - num);
76			for (int i = 0; i < c.Count - num; i++)
77			{
78				double doubleSum = 0;
79				long ticksSum = 0;
80				for (int j = i; j < i + number; j++)
81				{
82					doubleSum += c[j].Value;
83					ticksSum += c[j].Time.Ticks / number;
84				}
85				doubleSum /= number;
86				res.Add(new PerformanceInfo { Time = new DateTime(ticksSum), Value = doubleSum });
87			}
88			return res;
89		}
90	}
91}