public async Task PartitionProcessorCanCreateACheckpoint()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
// Send some events.
EventData lastEvent;
var dummyEvent = new EventData(Encoding.UTF8.GetBytes("I'm dummy."));
var partitionId = (await connection.GetPartitionIdsAsync(DefaultRetryPolicy)).First();
await using (var producer = new EventHubProducerClient(connection))
await using (var consumer = new EventHubConsumerClient(EventHubConsumerClient.DefaultConsumerGroupName, connectionString))
await using (var receiver = consumer.CreatePartitionReceiver(partitionId, EventPosition.Earliest))
{
// Send a few events. We are only interested in the last one of them.
var dummyEventsCount = 10;
for (int i = 0; i < dummyEventsCount; i++)
{
await producer.SendAsync(dummyEvent);
}
// Receive the events; because there is some non-determinism in the messaging flow, the
// sent events may not be immediately available. Allow for a small number of attempts to receive, in order
// to account for availability delays.
var receivedEvents = new List <EventData>();
var index = 0;
while ((receivedEvents.Count < dummyEventsCount) && (++index < ReceiveRetryLimit))
{
receivedEvents.AddRange(await receiver.ReceiveAsync(dummyEventsCount + 10, TimeSpan.FromMilliseconds(25)));
}
Assert.That(receivedEvents.Count, Is.EqualTo(dummyEventsCount));
lastEvent = receivedEvents.Last();
}
// Create a partition manager so we can retrieve the created checkpoint from it.
var partitionManager = new InMemoryPartitionManager();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connection,
partitionManager,
onProcessEvent: processorEvent =>
{
if (processorEvent.Data != null)
{
processorEvent.UpdateCheckpointAsync();
}
}
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize and receive events.
await eventProcessorManager.WaitStabilization();
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
IEnumerable <PartitionOwnership> ownershipEnumerable = await partitionManager.ListOwnershipAsync(connection.FullyQualifiedNamespace, connection.EventHubName, EventHubConsumerClient.DefaultConsumerGroupName);
Assert.That(ownershipEnumerable, Is.Not.Null);
Assert.That(ownershipEnumerable.Count, Is.EqualTo(1));
PartitionOwnership ownership = ownershipEnumerable.Single();
Assert.That(ownership.Offset.HasValue, Is.True);
Assert.That(ownership.Offset.Value, Is.EqualTo(lastEvent.Offset));
Assert.That(ownership.SequenceNumber.HasValue, Is.True);
Assert.That(ownership.SequenceNumber.Value, Is.EqualTo(lastEvent.SequenceNumber));
}
}
}
public async Task EventProcessorCanReceiveFromCheckpointedEventPosition()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
int receivedEventsCount = 0;
// Send some events.
var expectedEventsCount = 20;
var dummyEvent = new EventData(Encoding.UTF8.GetBytes("I'm dummy."));
long?checkpointedSequenceNumber = default;
var partitionId = (await connection.GetPartitionIdsAsync(DefaultRetryPolicy)).First();
await using (var producer = new EventHubProducerClient(connectionString))
await using (var consumer = new EventHubConsumerClient(EventHubConsumerClient.DefaultConsumerGroupName, connection))
await using (var receiver = consumer.CreatePartitionReceiver(partitionId, EventPosition.Earliest))
{
// Send a few dummy events. We are not expecting to receive these.
var dummyEventsCount = 30;
for (int i = 0; i < dummyEventsCount; i++)
{
await producer.SendAsync(dummyEvent);
}
// Receive the events; because there is some non-determinism in the messaging flow, the
// sent events may not be immediately available. Allow for a small number of attempts to receive, in order
// to account for availability delays.
var receivedEvents = new List <EventData>();
var index = 0;
while ((receivedEvents.Count < dummyEventsCount) && (++index < ReceiveRetryLimit))
{
receivedEvents.AddRange(await receiver.ReceiveAsync(dummyEventsCount + 10, TimeSpan.FromMilliseconds(25)));
}
Assert.That(receivedEvents.Count, Is.EqualTo(dummyEventsCount));
checkpointedSequenceNumber = receivedEvents.Last().SequenceNumber;
// Send the events we expect to receive.
for (int i = 0; i < expectedEventsCount; i++)
{
await producer.SendAsync(dummyEvent);
}
}
// Create a partition manager and add an ownership with a checkpoint in it.
var partitionManager = new InMemoryPartitionManager();
await partitionManager.ClaimOwnershipAsync(new List <PartitionOwnership>()
{
new PartitionOwnership(connection.FullyQualifiedNamespace, connection.EventHubName,
EventHubConsumerClient.DefaultConsumerGroupName, "ownerIdentifier", partitionId,
sequenceNumber: checkpointedSequenceNumber, lastModifiedTime: DateTimeOffset.UtcNow)
});
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connection,
partitionManager,
onProcessEvent: processorEvent =>
{
if (processorEvent.Data != null)
{
Interlocked.Increment(ref receivedEventsCount);
}
}
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize and receive events.
await eventProcessorManager.WaitStabilization();
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
Assert.That(receivedEventsCount, Is.EqualTo(expectedEventsCount));
}
}
}
