/// <summary>
/// Constructor
/// </summary>
/// <param name="ticks">The time from which to start calculating the bandwidth (e.g. DateTime.Now)</param>
public StreamProgressCalculator(long ticks, int numWindows = 6, int millisecondsPerWindow = 300)
{
this.numWindows = numWindows;
this.millisecondsPerWindow = millisecondsPerWindow;
ticksPerWindow = TICKS_PER_MILLISECOND * millisecondsPerWindow;
windowsPerSecond = 1000 / millisecondsPerWindow;
bandwidthCalculator = new BandwidthCalculator(numWindows);
Reset(ticks);
}
public void ShouldThrowOnInvalidWindow()
{
var c = new BandwidthCalculator(3);
Assert.That(() => c.Accumulate(-1, 100),
Throws.Exception
.TypeOf <ArgumentOutOfRangeException>()
.With.Property("ParamName").EqualTo("window"));
}
public void TestWithThreeMissingWindows()
{
var c = new BandwidthCalculator(3);
c.Accumulate(107, 100);
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(111, 100);
Assert.AreEqual(0f, c.BytesPerWindow()); // 0 bytes in 3 windows (108-110)
c.Clear();
c.Accumulate(107, 100);
c.Accumulate(108, 200);
c.Accumulate(112, 300);
Assert.AreEqual(0f, c.BytesPerWindow()); // 0 bytes in 3 windows (109-111)
}
public void OldDataShouldGoInCurrentWindow()
{
var c = new BandwidthCalculator(3);
c.Accumulate(107, 100);
c.Accumulate(108, 200);
c.Accumulate(109, 300);
Assert.AreEqual(300 / 2f, c.BytesPerWindow()); // 600 bytes in 2 windows (107-108)
c.Accumulate(105, 400); // should be included in the 109 window
Assert.AreEqual(300 / 2f, c.BytesPerWindow()); // still 600 bytes in 2 windows (107-108)
c.Accumulate(110, 500);
Assert.AreEqual(1000 / 3f, c.BytesPerWindow()); // 1000 bytes in 3 windows (107-109)
}
public void TestWithIncrementingWindows()
{
var c = new BandwidthCalculator(3);
c.Accumulate(43, 100);
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(43, 200);
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(44, 300);
Assert.AreEqual(300f, c.BytesPerWindow()); // Average is calculated as the average of the latest 4 windows excluding the current one
c.Accumulate(44, 400);
Assert.AreEqual(300f, c.BytesPerWindow()); // Average is calculated as the average of the latest 4 windows excluding the current one
c.Accumulate(45, 500);
Assert.AreEqual(500f, c.BytesPerWindow()); // 1000 bytes total in 2 windows (43-44)
c.Accumulate(46, 700);
Assert.AreEqual(1500 / 3f, c.BytesPerWindow()); // 1500 bytes total in 3 windows (43-45)
c.Accumulate(47, 800);
Assert.AreEqual(1900 / 3f, c.BytesPerWindow()); // 1700 bytes total in 3 windows (44-46); window 43 has dropped off
// Test that Clear() works
c.Clear();
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(43, 100);
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(43, 200);
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(44, 300);
Assert.AreEqual(300f, c.BytesPerWindow()); // Average is calculated as the average of the latest 4 windows excluding the current one
c.Accumulate(44, 400);
Assert.AreEqual(300f, c.BytesPerWindow()); // Average is calculated as the average of the latest 4 windows excluding the current one
c.Accumulate(45, 500);
Assert.AreEqual(500f, c.BytesPerWindow()); // 1000 bytes total in 2 windows (43-44)
}
public void TestWithTwoMissingWindows()
{
var c = new BandwidthCalculator(3);
c.Accumulate(107, 100);
Assert.AreEqual(0, c.BytesPerWindow());
c.Accumulate(110, 100);
Assert.AreEqual(100 / 3f, c.BytesPerWindow()); // 100 bytes in 3 windows (107-109)
c.Clear();
c.Accumulate(107, 100);
c.Accumulate(108, 200);
c.Accumulate(111, 300);
Assert.AreEqual(200 / 3f, c.BytesPerWindow()); // 200 bytes in 3 windows (108-110)
c.Clear();
c.Accumulate(107, 100);
c.Accumulate(108, 200);
c.Accumulate(109, 300);
c.Accumulate(112, 400);
Assert.AreEqual(300 / 3f, c.BytesPerWindow()); // 300 bytes in 3 windows (109-111)
}