Trigger Azure Function when all processes are done

Question

Is it possible to do trigger an Azure Function only when all items are processed in the Queue?

I have a Queue containing multiple Validations that needs to be done. Only after all the validations are validated it should trigger the next Azure Function that will create a report out of these validations

What I've tried

• After an item is process store the result (validations.Processed = True) and then do a check

  bool allProcessed = !validations
      .Where(v => v.LabFormulierId == validation.LabFormulierId)
      .Where(!x.Processed)
      .ToList()
      .Any();
  

• Add it to a temp Table, and remove it from the table when the items are finished processing

  bool allProcessed = !validationsToDo
      .Where(v => v.LabFormulierId == validation.LabFormulierId)
      .ToList()
      .Any();
  

---

And then later on check if all are processed with this var, and only then fire off the next Azure Function

...
if (allProcessed)
{
    await createReportQueueCollector.AddAsync(formulier);
    log.Info($"Add Formulier {formulier.Guid} to create-report queue");
}

Both did not work for me... Is there a clean way to do this?

Answer 1

In your code it's not clear what validations are and whether you store them externally.

Have a look at Durable Functions, they provide higher level API to correlate multiple actions. Queues are used behind the scenes but in a way hidden from developer.