public static async Task <List <CartData> > Run([OrchestrationTrigger] DurableOrchestrationContextBase context, TraceWriter log)
{
var cart = context.GetInput <List <CartData> >() ?? new List <CartData>();
var addItemTask = context.WaitForExternalEvent <CartData>(CartEvents.AddItem);
var removeItemTask = context.WaitForExternalEvent <CartData>(CartEvents.RemoveItem);
var isCompletedTask = context.WaitForExternalEvent <bool>(CartEvents.IsCompleted);
var setCartReminder = context.WaitForExternalEvent <CartReminderData>(CartEvents.SetReminder);
// Wait for any external event
var resultingEvent = await Task.WhenAny(addItemTask, removeItemTask, isCompletedTask, setCartReminder);
// Add item to cart
if (resultingEvent == addItemTask)
{
cart.Add(addItemTask.Result);
context.SetCustomStatus("readynow");
if (!context.IsReplaying)
{
log.Info($"Added {addItemTask.Result.ItemName} to the Shopping Cart.");
}
}
// Remove Item from cart
else if (resultingEvent == removeItemTask)
{
cart.Remove(cart.Find(x => x.ItemId == removeItemTask.Result.ItemId));
context.SetCustomStatus("readynow");
if (!context.IsReplaying)
{
log.Info($"Removed {removeItemTask.Result.ItemName} from the Shopping Cart.");
}
}
// Add reminder for cart (used to notify user of waiting cart with items)
else if (resultingEvent == setCartReminder)
{
var provisionTask = context.CallSubOrchestratorAsync("SetCartNotificationTimer", setCartReminder.Result);
if (!context.IsReplaying)
{
log.Info($"Added timer ({setCartReminder.Result.RemindInMinutes} minutes) for Shopping Cart.");
}
}
// Complete cart or stay running ?
if (resultingEvent == isCompletedTask && isCompletedTask.Result)
{
if (!context.IsReplaying)
{
log.Info("Completed the Shopping Cart.");
}
}
else
{
context.ContinueAsNew(cart); // the magic line
if (!context.IsReplaying)
{
log.Info($"cartList Count: {cart.Count}");
}
}
return(await Task.FromResult(cart));
}