Ejemplo n.º 1
0
        /// <summary>
        ///   The main loop of a partition pump.  It receives events from the Azure Event Hubs service
        ///   and delegates their processing to the event processor processing handlers.
        /// </summary>
        ///
        /// <param name="cancellationToken">A <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
        ///
        /// <returns>A task to be resolved on when the operation has completed.</returns>
        ///
        private async Task RunAsync(CancellationToken cancellationToken)
        {
            List <EventData> receivedEvents;
            Exception        unrecoverableException = null;

            // We'll break from the loop upon encountering a non-retriable exception.  The event processor periodically
            // checks its pumps' status, so it should be aware of when one of them stops working.

            while (!cancellationToken.IsCancellationRequested && unrecoverableException == null)
            {
                try
                {
                    receivedEvents = (await InnerConsumer.ReceiveAsync(MaximumMessageCount, Options.MaximumReceiveWaitTime, cancellationToken).ConfigureAwait(false)).ToList();

                    using DiagnosticScope diagnosticScope = EventDataInstrumentation.ClientDiagnostics.CreateScope(DiagnosticProperty.EventProcessorProcessingActivityName);
                    diagnosticScope.AddAttribute("kind", "server");

                    if (diagnosticScope.IsEnabled)
                    {
                        foreach (var eventData in receivedEvents)
                        {
                            if (EventDataInstrumentation.TryExtractDiagnosticId(eventData, out string diagnosticId))
                            {
                                diagnosticScope.AddLink(diagnosticId);
                            }
                        }
                    }

                    // Small workaround to make sure we call ProcessEvent with EventData = null when no events have been received.
                    // The code is expected to get simpler when we start using the async enumerator internally to receive events.

                    if (receivedEvents.Count == 0)
                    {
                        receivedEvents.Add(null);
                    }

                    diagnosticScope.Start();

                    foreach (var eventData in receivedEvents)
                    {
                        try
                        {
                            var processorEvent = new EventProcessorEvent(Context, eventData, OwnerEventProcessor.UpdateCheckpointAsync);
                            await OwnerEventProcessor.ProcessEventAsync(processorEvent).ConfigureAwait(false);
                        }
                        catch (Exception eventProcessingException)
                        {
                            diagnosticScope.Failed(eventProcessingException);
                            unrecoverableException = eventProcessingException;
                            CloseReason            = CloseReason.Exception;

                            break;
                        }
                    }
                }
                catch (Exception eventHubException)
                {
                    // Stop running only if it's not a retriable exception.

                    if (RetryPolicy.CalculateRetryDelay(eventHubException, 1) == null)
                    {
                        unrecoverableException = eventHubException;
                        CloseReason            = CloseReason.Exception;

                        break;
                    }
                }
            }

            if (unrecoverableException != null)
            {
                // In case an exception is thrown by ProcessExceptionAsync, don't catch it and
                // let the calling method (StopAsync) handle it.

                var errorContext = new ProcessorErrorContext(Context.PartitionId, unrecoverableException);
                await OwnerEventProcessor.ProcessExceptionAsync(errorContext).ConfigureAwait(false);
            }
        }
Ejemplo n.º 2
0
        /// <summary>
        ///   The main loop of a partition pump.  It receives events from the Azure Event Hubs service
        ///   and delegates their processing to the inner partition processor.
        /// </summary>
        ///
        /// <param name="cancellationToken">A <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
        ///
        /// <returns>A task to be resolved on when the operation has completed.</returns>
        ///
        private async Task RunAsync(CancellationToken cancellationToken)
        {
            IEnumerable <EventData> receivedEvents;
            Exception unrecoverableException = null;

            // We'll break from the loop upon encountering a non-retriable exception.  The event processor periodically
            // checks its pumps' status, so it should be aware of when one of them stops working.

            while (!cancellationToken.IsCancellationRequested)
            {
                try
                {
                    receivedEvents = await InnerConsumer.ReceiveAsync(MaximumMessageCount, Options.MaximumReceiveWaitTime, cancellationToken).ConfigureAwait(false);

                    using DiagnosticScope diagnosticScope = EventDataInstrumentation.ClientDiagnostics.CreateScope(DiagnosticProperty.EventProcessorProcessingActivityName);
                    diagnosticScope.AddAttribute("kind", "server");

                    if (diagnosticScope.IsEnabled)
                    {
                        foreach (var eventData in receivedEvents)
                        {
                            if (EventDataInstrumentation.TryExtractDiagnosticId(eventData, out string diagnosticId))
                            {
                                diagnosticScope.AddLink(diagnosticId);
                            }
                        }
                    }

                    diagnosticScope.Start();

                    try
                    {
                        await OwnerEventProcessor.ProcessEventsAsync(Context, receivedEvents).ConfigureAwait(false);
                    }
                    catch (Exception partitionProcessorException)
                    {
                        diagnosticScope.Failed(partitionProcessorException);
                        unrecoverableException = partitionProcessorException;
                        CloseReason            = PartitionProcessorCloseReason.PartitionProcessorException;

                        break;
                    }
                }
                catch (Exception eventHubException)
                {
                    // Stop running only if it's not a retriable exception.

                    if (RetryPolicy.CalculateRetryDelay(eventHubException, 1) == null)
                    {
                        unrecoverableException = eventHubException;
                        CloseReason            = PartitionProcessorCloseReason.EventHubException;

                        break;
                    }
                }
            }

            if (unrecoverableException != null)
            {
                // In case an exception is encountered while partition processor is processing the error, don't
                // catch it and let the calling method (StopAsync) handle it.

                await OwnerEventProcessor.ProcessExceptionAsync(Context, unrecoverableException).ConfigureAwait(false);
            }
        }