/// <summary>
/// Synchronizes the items that exist in the source only.
/// </summary>
/// <param name="batchKeys">The keys of the items.</param>
/// <param name="cancellationToken">A cancellation token that can be used to cancel the work.</param>
/// <returns></returns>
private async Task SyncItemsInSourceOnlyBatchAsync(List <TKey> batchKeys, CancellationToken cancellationToken)
{
if (!batchKeys.Any())
{
return;
}
switch (Configurations.SyncMode.ItemsInSourceOnly)
{
case SyncItemOperation.None: // do nothing
break;
case SyncItemOperation.Add:
var comparisonResult = new ComparisonResult <TItem>();
comparisonResult.ItemsInSourceOnly.AddRange(await SourceProvider.GetAsync(batchKeys, cancellationToken).ConfigureAwait(false));
await SyncAsync(comparisonResult, cancellationToken).ConfigureAwait(false);
break;
case SyncItemOperation.Delete:
BeforeDeletingItemsFromSourceAction?.Invoke(batchKeys);
await SourceProvider.DeleteAsync(batchKeys, cancellationToken).ConfigureAwait(false);
break;
default:
throw new NotSupportedException($"Not supported source {nameof(SyncItemOperation)} '{Configurations.SyncMode.ItemsInSourceOnly.ToString()}'.");
}
}
/// <summary>
/// Deletes the items from the source.
/// </summary>
/// <param name="items">The items to be deleted.</param>
/// <param name="cancellationToken">A cancellation token that can be used to cancel the work.</param>
/// <returns></returns>
protected override async Task DeleteFromSourceAsync(List <TItem> items, CancellationToken cancellationToken)
{
if (items == null || !items.Any())
{
return;
}
await SourceProvider.DeleteAsync(items.Select(x => KeySelector(x)).ToList(), cancellationToken).ConfigureAwait(false);
}
/// <summary> /// Deletes the items from the source. /// </summary> /// <param name="items">The items to be deleted.</param> /// <param name="cancellationToken">A cancellation token that can be used to cancel the work.</param> /// <returns></returns> protected override Task DeleteFromSourceAsync(List <TItem> items, CancellationToken cancellationToken) => SourceProvider.DeleteAsync(items, cancellationToken);