/// <summary>
/// Synchronizes the items that exist in the destination 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 SyncItemsInDestinationOnlyBatchAsync(List <TKey> batchKeys, CancellationToken cancellationToken)
{
if (!batchKeys.Any())
{
return;
}
switch (Configurations.SyncMode.ItemsInDestinationOnly)
{
case SyncItemOperation.None: // do nothing
break;
case SyncItemOperation.Add:
var comparisonResult = new ComparisonResult <TItem>();
comparisonResult.ItemsInDestinationOnly.AddRange(await DestinationProvider.GetAsync(batchKeys, cancellationToken).ConfigureAwait(false));
await SyncAsync(comparisonResult, cancellationToken).ConfigureAwait(false);
break;
case SyncItemOperation.Delete:
BeforeDeletingItemsFromDestinationAction?.Invoke(batchKeys);
await DestinationProvider.DeleteAsync(batchKeys, cancellationToken).ConfigureAwait(false);
break;
default:
throw new NotSupportedException($"Not supported destination {nameof(SyncItemOperation)} '{Configurations.SyncMode.ItemsInDestinationOnly.ToString()}'.");
}
}
/// <summary>
/// Delete the items from the destination.
/// </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 DeleteFromDestinationAsync(List <TItem> items, CancellationToken cancellationToken)
{
if (items == null || !items.Any())
{
return;
}
await DestinationProvider.DeleteAsync(items.Select(x => KeySelector(x)).ToList(), cancellationToken).ConfigureAwait(false);
}