/// <summary>
/// Wrap the provided search result task via a lazy enumerable. The search is continued
/// until the <see cref="SearchResult{T}.NextToken"/> is <code>null</code>, indicating that
/// there are no more results.
/// </summary>
/// <param name="packageFeed">The package feed to perform the search on.</param>
/// <param name="searchTask">The initial search result task to operate on.</param>
/// <param name="handleException">
/// A callback for handling exceptions during enumeration. The first parameter is the
/// source that encountered the exception. The second parameter is the exception itself.
/// This callback is never called from multiple threads at once.
/// </param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The lazy enumerable of package search metadata.</returns>
public static IEnumerable <IPackageSearchMetadata> Enumerate(
IPackageFeed packageFeed,
Task <SearchResult <IPackageSearchMetadata> > searchTask,
Action <string, Exception> handleException,
CancellationToken cancellationToken)
{
var enumerator = new PackageFeedEnumerator(packageFeed, searchTask, handleException, cancellationToken);
return(new PackageFeedEnumerable(enumerator));
}
private PackageFeedEnumerator(PackageFeedEnumerator other)
{
if (other == null)
{
throw new ArgumentNullException(nameof(other));
}
_packageFeed = other._packageFeed;
_startFromTask = other._startFromTask;
_handleException = other._handleException;
_cancellationToken = other._cancellationToken;
Reset();
}
public PackageFeedEnumerable(PackageFeedEnumerator enumerator)
{
_enumerator = enumerator;
}