public static async Task <IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
[DurableClient(TaskHub = "MprTaskHub")] IDurableClient starter,
ILogger log)
{
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
GreetingsRequest data = JsonConvert.DeserializeObject <GreetingsRequest>(requestBody);
string instanceId = await starter.StartNewAsync("FanOutInOrchestrator", data);
log.LogInformation($"Started orchestration with ID = '{instanceId}'.");
return(starter.CreateCheckStatusResponse(req, instanceId));
}
public static async Task <string> RunOrchestrator(
[OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)
{
log.LogInformation($"************** RunOrchestrator method executing ********************");
GreetingsRequest greetingsRequest = context.GetInput <GreetingsRequest>();
// Fanning out
log.LogInformation($"************** Fanning out ********************");
var parallelActivities = new List <Task <string> >();
foreach (var greeting in greetingsRequest.Greetings)
{
// Start a new activity function and capture the task reference
Task <string> task = context.CallActivityAsync <string>("FanOutIn_ActivityFunction", greeting);
// Store the task reference for later
parallelActivities.Add(task);
}
// Wait until all the activity functions have done their work
log.LogInformation($"************** 'Waiting' for parallel results ********************");
await Task.WhenAll(parallelActivities);
log.LogInformation($"************** All activity functions complete ********************");
// Now that all parallel activity functions have completed,
// fan in AKA aggregate the results, in this case into a single
// string using a StringBuilder
log.LogInformation($"************** fanning in ********************");
var sb = new StringBuilder();
foreach (var completedParallelActivity in parallelActivities)
{
sb.AppendLine(completedParallelActivity.Result);
}
return(sb.ToString());
}