public void BandwidthTests(ChannelSources src, BandwidthValues val)
{
ParametersField parameters = new ParametersField(src);
string text = "B" + (short)val;
parameters.EvaluateParameters(text);
Assert.AreEqual(val, parameters.Bandwidth);
Assert.AreEqual(text, parameters.ToString());
}
public void Simulate(double time)
{
CurrentTime = 0;
Server server = new Server();
Events.Enqueue(new BandwidthEvent {
Time = RandomNumberFromExpDistribution(5), BandwidthChange = BandwidthEvent.NextBandwidthChange()
});
Events.Enqueue(new DownloadingFinishedEvent {
Time = CHUNK_LENGTH * server.VideoSize / Bandwidth
});
Events.Enqueue(new MeasurementEvent {
Time = 0
});
int CyclesWithTooMuch = 0, CyclesWithTooLittle = 0;
while (CurrentTime < time)
{
Event nextEvent = Events.Dequeue();
var bufferGone = nextEvent.Time - CurrentTime;
if (nextEvent as BandwidthEvent != null)
{
BandwidthEvent bandwidthEvent = (BandwidthEvent)nextEvent;
BufferSize -= bufferGone;
BufferSize = BufferSize < 0 ? 0 : BufferSize;
CurrentTime = bandwidthEvent.Time;
Bandwidth += bandwidthEvent.BandwidthChange;
OnLogCreated(new LogEventArgs
{
Message = "Bandwidth change, time = " + Truncate(CurrentTime.ToString()) + ", buffer = " + Truncate(BufferSize.ToString()) +
", bandwidth = " + Bandwidth + ", size = " + server.VideoSize
});
Events.Enqueue(new BandwidthEvent
{
Time = CurrentTime + RandomNumberFromExpDistribution(10),
BandwidthChange = BandwidthEvent.NextBandwidthChange()
});
}
else if (nextEvent as DownloadingFinishedEvent != null)
{
DownloadingFinishedEvent downloadingEvent = (DownloadingFinishedEvent)nextEvent;
BufferSize -= bufferGone;
if (BufferSize < 10)
{
CyclesWithTooLittle++;
}
else
{
CyclesWithTooLittle = 0;
}
if (CyclesWithTooLittle > 2)
{
server.SetSmallerVideoSize();
CyclesWithTooLittle = 0;
}
BufferSize = BufferSize < 0 ? 0 : BufferSize;
CurrentTime = downloadingEvent.Time;
BufferSize += CHUNK_LENGTH;
OnLogCreated(new LogEventArgs
{
Message = "Downloaded, time = " + Truncate(CurrentTime.ToString()) + ", buffer = " + Truncate(BufferSize.ToString()) +
", bandwidth = " + Bandwidth + ", size = " + server.VideoSize
});
/// jeżeli nadwyżka bufora jest duża, to zliczaj, jak długo jest taki stan. Jeżeli więcej niż dwa chunki, to zwiększ jakość obrazu
var surplus = (BufferSize - 30 > 0) ? BufferSize - 30 : 0;
if (surplus > 0)
{
CyclesWithTooMuch++;
}
else
{
CyclesWithTooMuch = 0;
}
if (CyclesWithTooMuch > 2)
{
server.SetBiggerVideoSize();
CyclesWithTooMuch = 0;
}
OnLogCreated(new LogEventArgs
{
Message = "Request, time = " + Truncate(CurrentTime.ToString()) + ", buffer = " + Truncate(BufferSize.ToString()) +
", bandwidth = " + Bandwidth + ", size = " + server.VideoSize
});
Events.Enqueue(new DownloadingFinishedEvent
{
Time = CHUNK_LENGTH * server.VideoSize / Bandwidth + CurrentTime + surplus
});
}
else if (nextEvent as MeasurementEvent != null)
{
MeasurementEvent measurementEvent = (MeasurementEvent)nextEvent;
BufferSize -= bufferGone;
BufferSize = BufferSize < 0 ? 0 : BufferSize;
CurrentTime = measurementEvent.Time;
YGraphValues.Add(BufferSize);
BandwidthValues.Add(Bandwidth);
SegmentSizeValues.Add(server.VideoSize);
Events.Enqueue(new MeasurementEvent
{
Time = CurrentTime + MeasurementSamplingRate
});
}
}
}