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/// <summary> | |
/// Executes the given async delegates in parallel, | |
/// up to the given maximum degree of parallelism. | |
/// </summary> | |
public static async Task InvokeAsync(IEnumerable<Func<Task>> taskFactories, int maxDegreeOfParallelism) | |
{ | |
if (taskFactories == null) throw new ArgumentNullException(nameof(taskFactories)); | |
if (maxDegreeOfParallelism <= 0) throw new ArgumentException(nameof(maxDegreeOfParallelism)); | |
// Defensive copy. Similar to what Task.WhenAll/WhenAny does. | |
Func<Task>[] queue = taskFactories.ToArray(); | |
if (queue.Length == 0) { | |
return; | |
} | |
List<Task> tasksInFlight = new List<Task>(maxDegreeOfParallelism); | |
int index = 0; | |
do | |
{ | |
while (tasksInFlight.Count < maxDegreeOfParallelism && index < queue.Length) | |
{ | |
Func<Task> taskFactory = queue[index++]; | |
tasksInFlight.Add(taskFactory()); | |
} | |
Task completedTask = await Task.WhenAny(tasksInFlight).ConfigureAwait(false); | |
await completedTask.ConfigureAwait(false); // Check result. | |
tasksInFlight.Remove(completedTask); | |
} | |
while (index < queue.Length || tasksInFlight.Count != 0); | |
} |
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