/// <summary>
/// Sends a set of events to the associated Event Hub using a batched approach.
/// </summary>
///
/// <param name="eventBatch">The set of event data to send.</param>
/// <param name="cancellationToken">An optional <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>
///
/// <seealso cref="SendAsync(EventData, CancellationToken)" />
/// <seealso cref="SendAsync(EventData, SendEventOptions, CancellationToken)" />
/// <seealso cref="SendAsync(IEnumerable{EventData}, CancellationToken)" />
/// <seealso cref="SendAsync(IEnumerable{EventData}, SendEventOptions, CancellationToken)" />
///
public virtual async Task SendAsync(EventDataBatch eventBatch,
CancellationToken cancellationToken = default)
{
Argument.AssertNotNull(eventBatch, nameof(eventBatch));
AssertSinglePartitionReference(eventBatch.SendOptions.PartitionId, eventBatch.SendOptions.PartitionKey);
// Determine the transport producer to delegate the send operation to. Because sending to a specific
// partition requires a dedicated client, use (or create) that client if a partition was specified. Otherwise
// the default gateway producer can be used to request automatic routing from the Event Hubs service gateway.
TransportProducer activeProducer;
if (String.IsNullOrEmpty(eventBatch.SendOptions.PartitionId))
{
activeProducer = EventHubProducer;
}
else
{
// This assertion is intended as an additional check, not as a guarantee. There still exists a benign
// race condition where a transport producer may be created after the client has been closed; in this case
// the transport producer will be force-closed with the associated connection or, worst case, will close once
// its idle timeout period elapses.
Argument.AssertNotClosed(IsClosed, nameof(EventHubProducerClient));
activeProducer = PartitionProducers.GetOrAdd(eventBatch.SendOptions.PartitionId, id => Connection.CreateTransportProducer(id, RetryPolicy));
}
using DiagnosticScope scope = CreateDiagnosticScope();
try
{
await activeProducer.SendAsync(eventBatch, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
}