public static async Task <JToken> ExecuteAsync(this ParallelAction action,
StateMachineContext context,
JToken input)
{
action.CheckArgNull(nameof(action));
context.CheckArgNull(nameof(context));
input.CheckArgNull(nameof(input));
var output = new JObject();
var tasks = action.Actions.Select(async(a, idx) =>
{
var item = await a.ExecuteAsync(context, input.DeepClone());
Debug.Assert(item != null);
var id = string.IsNullOrWhiteSpace(a.Name) ? idx.ToString() : a.Name;
return(id, item);
}).ToList();
if (action.CompletionType == ParallelCompletionType.And)
{
var results = await Task.WhenAll(tasks);
Array.ForEach(results, tuple => output[tuple.id] = tuple.item);
}
else if (action.CompletionType == ParallelCompletionType.Xor)
{
var resultTask = await Task.WhenAny(tasks);
var tuple = await resultTask;
output[tuple.id] = tuple.item;
}
else
{
Debug.Assert(action.CompletionType == ParallelCompletionType.N_of_M);
Debug.Assert(action.N > 0);
var resultCount = 0;
while (resultCount < action.N && resultCount < tasks.Count)
{
var resultTask = await Task.WhenAny(tasks);
tasks.Remove(resultTask);
var tuple = await resultTask;
output[tuple.id] = tuple.item;
resultCount++;
}
}
return(output);
}
