protected bool Equals(ChangeStatistics other)
{
return(_index == other._index &&
_adds == other._adds &&
_updates == other._updates && _removes == other._removes && _evaluates == other._evaluates &&
_count == other._count && _timestamp.Equals(other._timestamp));
}
/// <summary>
/// Accumulates update statistics.
/// </summary>
/// <typeparam name="TSource">The type of the source.</typeparam>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <param name="source">The source.</param>
/// <returns>An observable which emits the change summary.</returns>
/// <exception cref="System.ArgumentNullException">source.</exception>
public static IObservable <ChangeSummary> CollectUpdateStats <TSource, TKey>(this IObservable <IChangeSet <TSource, TKey> > source)
where TKey : notnull
{
if (source is null)
{
throw new ArgumentNullException(nameof(source));
}
return(source.Scan(
ChangeSummary.Empty,
(seed, next) =>
{
int index = seed.Overall.Index + 1;
int adds = seed.Overall.Adds + next.Adds;
int updates = seed.Overall.Updates + next.Updates;
int removes = seed.Overall.Removes + next.Removes;
int evaluates = seed.Overall.Refreshes + next.Refreshes;
int moves = seed.Overall.Moves + next.Moves;
int total = seed.Overall.Count + next.Count;
var latest = new ChangeStatistics(index, next.Adds, next.Updates, next.Removes, next.Refreshes, next.Moves, next.Count);
var overall = new ChangeStatistics(index, adds, updates, removes, evaluates, moves, total);
return new ChangeSummary(index, latest, overall);
}));
}