private static void DoTestRunningAverage(RunningAverage runningAverage)
{
Assert.AreEqual(0, runningAverage.Count);
Assert.IsTrue(Double.IsNaN(runningAverage.Average));
runningAverage.AddDatum(1.0);
Assert.AreEqual(1, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.AddDatum(1.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.AddDatum(4.0);
Assert.AreEqual(3, runningAverage.Count);
Assert.AreEqual(2.0, runningAverage.Average);
runningAverage.AddDatum(-4.0);
Assert.AreEqual(4, runningAverage.Count);
Assert.AreEqual(0.5, runningAverage.Average);
runningAverage.RemoveDatum(-4.0);
Assert.AreEqual(3, runningAverage.Count);
Assert.AreEqual(2.0, runningAverage.Average);
runningAverage.RemoveDatum(4.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.ChangeDatum(0.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.ChangeDatum(2.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(2.0, runningAverage.Average);
}
private static void DoTestRunningAverage(RunningAverage runningAverage)
{
Assert.AreEqual(0, runningAverage.Count);
Assert.IsTrue(Double.IsNaN(runningAverage.Average));
runningAverage.AddDatum(1.0);
Assert.AreEqual(1, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.AddDatum(1.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.AddDatum(4.0);
Assert.AreEqual(3, runningAverage.Count);
Assert.AreEqual(2.0, runningAverage.Average);
runningAverage.AddDatum(-4.0);
Assert.AreEqual(4, runningAverage.Count);
Assert.AreEqual(0.5, runningAverage.Average);
runningAverage.RemoveDatum(-4.0);
Assert.AreEqual(3, runningAverage.Count);
Assert.AreEqual(2.0, runningAverage.Average);
runningAverage.RemoveDatum(4.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.ChangeDatum(0.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(1.0, runningAverage.Average);
runningAverage.ChangeDatum(2.0);
Assert.AreEqual(2, runningAverage.Count);
Assert.AreEqual(2.0, runningAverage.Average);
}
public void UpdateItemPref(Object itemID, double prefDelta, bool remove)
{
if (!remove && stdDevWeighted)
{
throw new NotSupportedException("Can't update only when stdDevWeighted is set");
}
buildAverageDiffsLock.AcquireReaderLock(Constants.INFINITE_TIMEOUT);
try
{
foreach (KeyValuePair <Object, Dictionary <Object, RunningAverage> > entry in averageDiffs)
{
bool matchesItemID1 = itemID.Equals(entry.Key);
foreach (KeyValuePair <Object, RunningAverage> entry2 in entry.Value)
{
RunningAverage average = entry2.Value;
if (matchesItemID1)
{
if (remove)
{
average.RemoveDatum(prefDelta);
}
else
{
average.ChangeDatum(-prefDelta);
}
}
else if (itemID.Equals(entry2.Key))
{
if (remove)
{
average.RemoveDatum(-prefDelta);
}
else
{
average.ChangeDatum(prefDelta);
}
}
}
}
RunningAverage itemAverage;
if (averageItemPref.TryGetValue(itemID, out itemAverage) && itemAverage != null)
{
itemAverage.ChangeDatum(prefDelta);
}
}
finally
{
buildAverageDiffsLock.ReleaseReaderLock();
}
}
public override void SetPreference(Object userID, Object itemID, double value)
{
double prefDelta;
try
{
User theUser = this.DataModel.GetUser(userID);
Preference oldPref = theUser.GetPreferenceFor(itemID);
prefDelta = oldPref == null ? value : value - oldPref.Value;
}
catch
{
prefDelta = value;
}
base.SetPreference(userID, itemID, value);
buildAveragesLock.AcquireWriterLock(Constants.INFINITE_TIMEOUT);
try
{
RunningAverage average = null;
if (!itemAverages.TryGetValue(itemID, out average))
{
RunningAverage newAverage = new FullRunningAverage();
newAverage.AddDatum(prefDelta);
itemAverages.Add(itemID, newAverage);
}
else
{
average.ChangeDatum(prefDelta);
}
}
finally
{
buildAveragesLock.ReleaseWriterLock();
}
}