public async Task StartAsyncDoesNothingWhenEventProcessorIsRunning()
{
var partitions = 1;
await using (EventHubScope scope = await EventHubScope.CreateAsync(partitions))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
int initializeCallsCount = 0;
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
onInitialize: eventArgs =>
Interlocked.Increment(ref initializeCallsCount)
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize.
await eventProcessorManager.WaitStabilization();
// We should be able to call StartAsync again without getting an exception.
Assert.That(async() => await eventProcessorManager.StartAllAsync(), Throws.Nothing);
// Give the event processors more time in case they try to initialize again, which shouldn't happen.
await eventProcessorManager.WaitStabilization();
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
Assert.That(initializeCallsCount, Is.EqualTo(partitions));
}
}
}
public async Task StopAsyncCallsPartitionProcessorCloseAsyncWithShutdownReason()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
var closeCalls = new ConcurrentDictionary <string, int>();
var stopReasons = new ConcurrentDictionary <string, ProcessingStoppedReason>();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
onStop: eventArgs =>
{
closeCalls.AddOrUpdate(eventArgs.PartitionId, 1, (partitionId, value) => value + 1);
stopReasons[eventArgs.PartitionId] = eventArgs.Reason;
}
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize.
await eventProcessorManager.WaitStabilization();
// CloseAsync should have not been called when constructing the event processor or during processing initialization.
Assert.That(closeCalls.Keys, Is.Empty);
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
await using (var producer = new EventHubProducerClient(connectionString))
{
var partitionIds = await producer.GetPartitionIdsAsync();
foreach (var partitionId in partitionIds)
{
Assert.That(closeCalls.TryGetValue(partitionId, out var calls), Is.True, $"{ partitionId }: CloseAsync should have been called.");
Assert.That(calls, Is.EqualTo(1), $"{ partitionId }: CloseAsync should have been called only once.");
Assert.That(stopReasons.TryGetValue(partitionId, out ProcessingStoppedReason reason), Is.True, $"{ partitionId }: processing stopped reason should have been set.");
Assert.That(reason, Is.EqualTo(ProcessingStoppedReason.Shutdown), $"{ partitionId }: unexpected processing stopped reason.");
}
Assert.That(closeCalls.Keys.Count, Is.EqualTo(partitionIds.Count()));
}
}
}
public async Task PartitionDistributionIsEvenAfterLoadBalancing(int partitions, int eventProcessors)
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(partitions))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
ConcurrentDictionary <string, int> ownedPartitionsCount = new ConcurrentDictionary <string, int>();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString
// TODO: fix test. OwnerIdentifier is not accessible anymore.
// onInitialize: eventArgs =>
// ownedPartitionsCount.AddOrUpdate(eventArgs.Context.OwnerIdentifier, 1, (ownerId, value) => value + 1),
// onStop: eventArgs =>
// ownedPartitionsCount.AddOrUpdate(eventArgs.Context.OwnerIdentifier, 0, (ownerId, value) => value - 1)
);
eventProcessorManager.AddEventProcessors(eventProcessors);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize.
await eventProcessorManager.WaitStabilization();
// Take a snapshot of the current partition balancing status.
IEnumerable <int> ownedPartitionsCountSnapshot = ownedPartitionsCount.ToArray().Select(kvp => kvp.Value);
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
var minimumOwnedPartitionsCount = partitions / eventProcessors;
var maximumOwnedPartitionsCount = minimumOwnedPartitionsCount + 1;
foreach (var count in ownedPartitionsCountSnapshot)
{
Assert.That(count, Is.InRange(minimumOwnedPartitionsCount, maximumOwnedPartitionsCount));
}
Assert.That(ownedPartitionsCountSnapshot.Sum(), Is.EqualTo(partitions));
}
}
}
public async Task StartAsyncCallsPartitionProcessorInitializeAsync()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
var consumerGroup = EventHubConsumerClient.DefaultConsumerGroupName;
await using (var consumer = new EventHubConsumerClient(consumerGroup, connectionString))
{
var initializeCalls = new ConcurrentDictionary <string, int>();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
consumerGroup,
connectionString,
onInitialize: eventArgs =>
initializeCalls.AddOrUpdate(eventArgs.PartitionId, 1, (partitionId, value) => value + 1)
);
eventProcessorManager.AddEventProcessors(1);
// InitializeAsync should have not been called when constructing the event processors.
Assert.That(initializeCalls.Keys, Is.Empty);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize.
await eventProcessorManager.WaitStabilization();
// Validate results before calling stop. This way, we can make sure the initialize calls were
// triggered by start.
var partitionIds = await consumer.GetPartitionIdsAsync();
foreach (var partitionId in partitionIds)
{
Assert.That(initializeCalls.TryGetValue(partitionId, out var calls), Is.True, $"{ partitionId }: InitializeAsync should have been called.");
Assert.That(calls, Is.EqualTo(1), $"{ partitionId }: InitializeAsync should have been called only once.");
}
Assert.That(initializeCalls.Keys.Count, Is.EqualTo(partitionIds.Count()));
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
}
}
}
public async Task PartitionProcessorProcessEventsAsyncIsCalledWithNoEvents()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
var receivedEvents = new ConcurrentBag <EventData>();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
onProcessEvent: eventArgs =>
receivedEvents.Add(eventArgs.Data)
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize.
await eventProcessorManager.WaitStabilization();
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
Assert.That(receivedEvents, Is.Not.Empty);
Assert.That(receivedEvents.Any(eventData => eventData != null), Is.False);
}
}
}
public async Task EventProcessorWaitsMaximumWaitTimeForEvents(int maximumWaitTimeInSecs)
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
var timestamps = new ConcurrentDictionary <string, List <DateTimeOffset> >();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
clientOptions: new EventProcessorClientOptions {
MaximumWaitTime = TimeSpan.FromSeconds(maximumWaitTimeInSecs)
},
onInitialize: eventArgs =>
timestamps.TryAdd(eventArgs.PartitionId, new List <DateTimeOffset> {
DateTimeOffset.UtcNow
}),
onProcessEvent: eventArgs =>
timestamps.AddOrUpdate
(
// The key already exists, so the 'addValue' factory will never be called.
eventArgs.Partition.PartitionId,
partitionId => null,
(partitionId, list) =>
{
list.Add(DateTimeOffset.UtcNow);
return(list);
}
)
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize.
await eventProcessorManager.WaitStabilization();
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
foreach (KeyValuePair <string, List <DateTimeOffset> > kvp in timestamps)
{
var partitionId = kvp.Key;
List <DateTimeOffset> partitionTimestamps = kvp.Value;
Assert.That(partitionTimestamps.Count, Is.GreaterThan(1), $"{ partitionId }: more time stamp samples were expected.");
for (int index = 1; index < partitionTimestamps.Count; index++)
{
var elapsedTime = partitionTimestamps[index].Subtract(partitionTimestamps[index - 1]).TotalSeconds;
Assert.That(elapsedTime, Is.GreaterThan(maximumWaitTimeInSecs - 0.1), $"{ partitionId }: elapsed time between indexes { index - 1 } and { index } was too short.");
Assert.That(elapsedTime, Is.LessThan(maximumWaitTimeInSecs + 5), $"{ partitionId }: elapsed time between indexes { index - 1 } and { index } was too long.");
++index;
}
}
}
}
}
public async Task EventProcessorCanReceiveFromSpecifiedInitialEventPosition()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
int receivedEventsCount = 0;
// Send some events.
var expectedEventsCount = 20;
DateTimeOffset enqueuedTime;
await using (var producer = new EventHubProducerClient(connection))
{
// Send a few dummy events. We are not expecting to receive these.
using (var dummyBatch = await producer.CreateBatchAsync())
{
for (int i = 0; i < 30; i++)
{
dummyBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes("I'm dummy.")));
}
await producer.SendAsync(dummyBatch);
}
// Wait a reasonable amount of time so the events are able to reach the service.
await Task.Delay(1000);
// Send the events we expect to receive.
enqueuedTime = DateTimeOffset.UtcNow;
using (var dummyBatch = await producer.CreateBatchAsync())
{
for (int i = 0; i < expectedEventsCount; i++)
{
dummyBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes("I'm dummy.")));
}
await producer.SendAsync(dummyBatch);
}
}
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
onInitialize: eventArgs =>
eventArgs.DefaultStartingPosition = EventPosition.FromEnqueuedTime(enqueuedTime),
onProcessEvent: eventArgs =>
{
if (eventArgs.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));
}
}
}
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;
await using (var producer = new EventHubProducerClient(connection))
await using (var consumer = new EventHubConsumerClient(EventHubConsumerClient.DefaultConsumerGroupName, connectionString))
{
// Send a few events. We are only interested in the last one of them.
var dummyEventsCount = 10;
using (var dummyBatch = await producer.CreateBatchAsync())
{
for (int i = 0; i < dummyEventsCount; i++)
{
dummyBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes("I'm dummy.")));
}
await producer.SendAsync(dummyBatch);
}
// 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))
{
Assert.Fail("Convert to iterator.");
//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 MockCheckPointStorage();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
partitionManager,
onProcessEvent: eventArgs =>
{
if (eventArgs.Data != null)
{
eventArgs.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));
}
}
}
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))
{
string partitionId;
int receivedEventsCount = 0;
// Send some events.
var expectedEventsCount = 20;
long?checkpointedSequenceNumber = default;
await using (var producer = new EventHubProducerClient(connectionString))
await using (var consumer = new EventHubConsumerClient(EventHubConsumerClient.DefaultConsumerGroupName, connection))
{
partitionId = (await consumer.GetPartitionIdsAsync()).First();
// Send a few dummy events. We are not expecting to receive these.
var dummyEventsCount = 30;
using (var dummyBatch = await producer.CreateBatchAsync())
{
for (int i = 0; i < dummyEventsCount; i++)
{
dummyBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes("I'm dummy.")));
}
await producer.SendAsync(dummyBatch);
}
// 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))
{
Assert.Fail("Convert to iterator");
//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.
using (var dummyBatch = await producer.CreateBatchAsync())
{
for (int i = 0; i < expectedEventsCount; i++)
{
dummyBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes("I'm dummy.")));
}
await producer.SendAsync(dummyBatch);
}
}
// Create a partition manager and add an ownership with a checkpoint in it.
var partitionManager = new MockCheckPointStorage();
await partitionManager.ClaimOwnershipAsync(new List <PartitionOwnership>()
{
new PartitionOwnership(connection.FullyQualifiedNamespace, connection.EventHubName,
EventHubConsumerClient.DefaultConsumerGroupName, "ownerIdentifier", partitionId,
lastModifiedTime: DateTimeOffset.UtcNow)
});
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
partitionManager,
onProcessEvent: eventArgs =>
{
if (eventArgs.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));
}
}
}
public async Task EventProcessorCanStartAgainAfterStopping()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
int receivedEventsCount = 0;
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
onProcessEvent: eventArgs =>
{
if (eventArgs.Data != null)
{
Interlocked.Increment(ref receivedEventsCount);
}
}
);
eventProcessorManager.AddEventProcessors(1);
// Send some events.
var expectedEventsCount = 20;
await using (var producer = new EventHubProducerClient(connection))
{
using (var dummyBatch = await producer.CreateBatchAsync())
{
for (int i = 0; i < expectedEventsCount; i++)
{
dummyBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes("I'm dummy.")));
}
await producer.SendAsync(dummyBatch);
}
}
// We'll start and stop the event processors twice. This way, we can assert they will behave
// the same way both times, reprocessing all events in the second run.
for (int i = 0; i < 2; i++)
{
receivedEventsCount = 0;
// 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), $"Events should match in iteration { i + 1 }.");
}
}
}
}
public async Task PartitionProcessorProcessEventsAsyncReceivesAllEvents()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var connection = new EventHubConnection(connectionString))
{
var allReceivedEvents = new ConcurrentDictionary <string, List <EventData> >();
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumerClient.DefaultConsumerGroupName,
connectionString,
onProcessEvent: eventArgs =>
{
if (eventArgs.Data != null)
{
allReceivedEvents.AddOrUpdate
(
eventArgs.Partition.PartitionId,
partitionId => new List <EventData>()
{
eventArgs.Data
},
(partitionId, list) =>
{
list.Add(eventArgs.Data);
return(list);
}
);
}
}
);
eventProcessorManager.AddEventProcessors(1);
// Send some events.
string[] partitionIds;
var expectedEvents = new Dictionary <string, List <EventData> >();
await using (var producer = new EventHubProducerClient(connection))
{
partitionIds = await producer.GetPartitionIdsAsync();
foreach (var partitionId in partitionIds)
{
// Send a similar set of events for every partition.
using (var partitionBatch = await producer.CreateBatchAsync(new CreateBatchOptions {
PartitionId = partitionId
}))
{
expectedEvents[partitionId] = new List <EventData>
{
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: event processor tests are so long.")),
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: there are so many of them.")),
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: will they ever end?")),
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: let's add a few more messages.")),
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: this is a monologue.")),
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: loneliness is what I feel.")),
new EventData(Encoding.UTF8.GetBytes($"{ partitionId }: the end has come."))
};
foreach (var expectedEvent in expectedEvents[partitionId])
{
partitionBatch.TryAdd(expectedEvent);
}
await producer.SendAsync(partitionBatch);
}
}
}
// 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. Make sure we received every event with the correct partition context,
// in the order they were sent.
foreach (var partitionId in partitionIds)
{
Assert.That(allReceivedEvents.TryGetValue(partitionId, out List <EventData> partitionReceivedEvents), Is.True, $"{ partitionId }: there should have been a set of events received.");
Assert.That(partitionReceivedEvents.Count, Is.EqualTo(expectedEvents[partitionId].Count), $"{ partitionId }: amount of received events should match.");
var index = 0;
foreach (EventData receivedEvent in partitionReceivedEvents)
{
Assert.That(receivedEvent.IsEquivalentTo(expectedEvents[partitionId][index]), Is.True, $"{ partitionId }: the received event at index { index } did not match the sent set of events.");
++index;
}
}
Assert.That(allReceivedEvents.Keys.Count, Is.EqualTo(partitionIds.Count()));
}
}
}