/// <summary>
/// Invokes an asynchronous action on each item in the collection in parallel
/// </summary>
/// <typeparam name="T">The type of an item</typeparam>
/// <param name="enumerator">The collection of items to perform actions on</param>
/// <param name="asyncItemAction">An asynchronous action to perform on the item</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <exception cref="ParallelForEachException">Wraps any exception(s) that occurred inside <paramref name="asyncItemAction"/></exception>
/// <exception cref="OperationCanceledException">Thrown when the loop is canceled with <paramref name="cancellationToken"/></exception>
public static Task ParallelForEachAsync <T>(
this IAsyncEnumerator <T> enumerator,
Func <T, Task> asyncItemAction,
CancellationToken cancellationToken = default)
=> enumerator.ParallelForEachAsync(
(item, index) => asyncItemAction(item),
/*maxDegreeOfParallelism:*/ 0,
/*breakLoopOnException:*/ false,
/*gracefulBreak:*/ true,
cancellationToken);
/// <summary>
/// Invokes an asynchronous action on each item in the collection in parallel
/// </summary>
/// <typeparam name="T">The type of an item</typeparam>
/// <param name="enumerator">The collection of items to perform actions on</param>
/// <param name="asyncItemAction">An asynchronous action to perform on the item, where first argument is the item and second argument is item's index in the collection</param>
/// <param name="maxDegreeOfParallelism">Maximum items to schedule processing in parallel. The actual concurrency level depends on TPL settings. Set to 0 to choose a default value based on processor count.</param>
/// <param name="breakLoopOnException">Set to True to stop processing items when first exception occurs. The result <see cref="AggregateException"/> might contain several exceptions though when faulty tasks finish at the same time.</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <exception cref="ParallelForEachException">Wraps any exception(s) that occurred inside <paramref name="asyncItemAction"/></exception>
/// <exception cref="OperationCanceledException">Thrown when the loop is canceled with <paramref name="cancellationToken"/></exception>
public static Task ParallelForEachAsync <T>(
this IAsyncEnumerator <T> enumerator,
Func <T, long, Task> asyncItemAction,
int maxDegreeOfParallelism,
bool breakLoopOnException,
CancellationToken cancellationToken = default)
=> enumerator.ParallelForEachAsync(
asyncItemAction,
maxDegreeOfParallelism,
breakLoopOnException,
/*gracefulBreak:*/ true,
cancellationToken);
/// <summary>
/// Invokes an asynchronous action on each item in the collection in parallel
/// </summary>
/// <typeparam name="T">The type of an item</typeparam>
/// <param name="enumerator">The collection of items to perform actions on</param>
/// <param name="asyncItemAction">An asynchronous action to perform on the item</param>
/// <param name="maxDegreeOfParallelism">Maximum items to schedule processing in parallel. The actual concurrency level depends on TPL settings. Set to 0 to choose a default value based on processor count.</param>
/// <param name="breakLoopOnException">Set to True to stop processing items when first exception occurs. The result <see cref="AggregateException"/> might contain several exceptions though when faulty tasks finish at the same time.</param>
/// <param name="gracefulBreak">If True (the default behavior), waits on completion for all started tasks when the loop breaks due to cancellation or an exception</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <exception cref="ParallelForEachException">Wraps any exception(s) that occurred inside <paramref name="asyncItemAction"/></exception>
/// <exception cref="OperationCanceledException">Thrown when the loop is canceled with <paramref name="cancellationToken"/></exception>
public static Task ParallelForEachAsync <T>(
this IAsyncEnumerator <T> enumerator,
Func <T, Task> asyncItemAction,
int maxDegreeOfParallelism,
bool breakLoopOnException,
bool gracefulBreak,
CancellationToken cancellationToken = default)
=> enumerator.ParallelForEachAsync(
(item, index) => asyncItemAction(item),
maxDegreeOfParallelism,
breakLoopOnException,
gracefulBreak,
cancellationToken);