/// <summary>
/// Gets the original <see cref="ServiceBusReceiver"/> instance from the Azure Service Bus event <paramref name="args"/>.
/// </summary>
/// <param name="args">The event args that's used to process an Azure Service Bus message.</param>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="args"/> is <c>null</c>.</exception>
/// <exception cref="TypeNotFoundException">Thrown when the no Azure Service Bus receiver could be found on the <paramref name="args"/>.</exception>
/// <exception cref="InvalidOperationException">Thrown when no value could be found for the Azure Service Bus receiver on the <paramref name="args"/>.</exception>
/// <exception cref="InvalidCastException">Thrown when the value for the Azure Service Bus receiver on the <paramref name="args"/> wasn't the expected type.</exception>
public static ServiceBusReceiver GetServiceBusReceiver(this ProcessMessageEventArgs args)
{
Guard.NotNull(args, nameof(args), "Requires an event args instance to retrieve the original Service Bus message receiver");
FieldInfo receiverField = args.GetType().GetField("_receiver", BindingFlags.Instance | BindingFlags.NonPublic);
if (receiverField is null)
{
throw new TypeNotFoundException(
"Could not find an Azure Service Bus receiver instance on the current received event args");
}
object receiverValue = receiverField.GetValue(args);
if (receiverValue is null)
{
throw new InvalidOperationException(
"Could not find any value for the Azure Service Bus receiver instance on the current received event args");
}
if (receiverValue is ServiceBusReceiver receiver)
{
return(receiver);
}
throw new InvalidCastException(
"Could not find a value for the Azure Service Bus receiver instance with the expected type on the current received event args");
}
protected virtual async Task OnMessageHandler(ServiceBusReceivedMessage message, CancellationToken processorCancellationToken)
{
var args = new ProcessMessageEventArgs(
message,
Receiver,
processorCancellationToken);
await Processor.OnProcessMessageAsync(args).ConfigureAwait(false);
}
/// <summary> /// Called when a 'process message' event is triggered. /// </summary> /// /// <param name="args">The set of arguments to identify the context of the event to be processed.</param> private Task OnProcessMessageAsync(ProcessMessageEventArgs args) => _processMessage(args);