public SortedDictionary <string, string[]> CompareOwners(
SortedDictionary <string, SortedSet <string> > oldData,
SortedDictionary <string, SortedSet <string> > newData)
{
if (oldData.Comparer != StringComparer.OrdinalIgnoreCase)
{
throw new ArgumentException("The old data should have a case-insensitive comparer.", nameof(oldData));
}
if (newData.Comparer != StringComparer.OrdinalIgnoreCase)
{
throw new ArgumentException("The new data should have a case-insensitive comparer.", nameof(newData));
}
// Use ordinal comparison to allow username case changes to flow through.
var stopwatch = Stopwatch.StartNew();
var result = CompareData(
oldData,
newData,
"package ID",
"owners",
StringComparer.Ordinal);
stopwatch.Stop();
_telemetryService.TrackOwnerSetComparison(oldData.Count, newData.Count, result.Count, stopwatch.Elapsed);
return(result);
}
public SortedDictionary <string, string[]> Compare(
SortedDictionary <string, SortedSet <string> > oldData,
SortedDictionary <string, SortedSet <string> > newData)
{
if (oldData.Comparer != StringComparer.OrdinalIgnoreCase)
{
throw new ArgumentException("The old data should have a case-insensitive comparer.", nameof(oldData));
}
if (newData.Comparer != StringComparer.OrdinalIgnoreCase)
{
throw new ArgumentException("The new data should have a case-insensitive comparer.", nameof(newData));
}
var stopwatch = Stopwatch.StartNew();
// We use a very simplistic algorithm here. Perform one pass on the new data to find the added or changed
// package IDs. Then perform a second pass on the old data to find removed package IDs. We can optimize
// this later if necessary.
//
// We emit all of the usernames when a package ID's owners have changed instead of the delta. This is
// because Azure Search does not have a way to append or remove a specific item from a field that is an
// array. The entire new array needs to be provided.
var result = new SortedDictionary <string, string[]>(StringComparer.OrdinalIgnoreCase);
// First pass: find added or changed sets.
foreach (var pair in newData)
{
var id = pair.Key;
var newOwners = pair.Value;
if (!oldData.TryGetValue(id, out var oldOwners))
{
// ADDED: The package ID does not exist in the old data, which means the package ID was added.
result.Add(id, newOwners.ToArray());
_logger.LogInformation(
"The package ID {ID} has been added, with {AddedCount} owners.",
id,
newOwners.Count);
}
else
{
// The package ID exists in the old data. We need to check if the owner set has changed. Perform
// an ordinal comparison to allow username case changes to flow through.
var removedUsernames = oldOwners.Except(newOwners, StringComparer.Ordinal).ToList();
var addedUsernames = newOwners.Except(oldOwners, StringComparer.Ordinal).ToList();
if (removedUsernames.Any() || addedUsernames.Any())
{
// CHANGED: The username set has changed.
result.Add(id, newOwners.ToArray());
_logger.LogInformation(
"The package ID {ID} has an ownership change, with {RemovedCount} owners removed and " +
"{AddedCount} owners added.",
id,
removedUsernames.Count,
addedUsernames.Count);
}
}
}
// Second pass: find removed sets.
foreach (var pair in oldData)
{
var id = pair.Key;
var oldOwners = pair.Value;
if (!newData.TryGetValue(id, out var newOwners))
{
// REMOVED: The package ID does not exist in the new data, which means the package ID was removed.
result.Add(id, EmptyStringArray);
_logger.LogInformation(
"The package ID {ID} has been removed, with {RemovedCount} owners",
id,
oldOwners.Count);
}
}
stopwatch.Stop();
_telemetryService.TrackOwnerSetComparison(oldData.Count, newData.Count, result.Count, stopwatch.Elapsed);
return(result);
}