/// <summary>
/// Fetches the next batch of active messages without changing the state of the receiver or the message source.
/// </summary>
/// <param name="sequenceNumber">The sequence number from where to peek the message.</param>
/// <param name="maxMessages">The maximum number of messages that will be fetched.</param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
/// <returns>An <see cref="IList{ServiceBusReceivedMessage}" /> of messages that were peeked.</returns>
private async Task <IList <ServiceBusReceivedMessage> > PeekBatchAtInternalAsync(
long?sequenceNumber,
int maxMessages,
CancellationToken cancellationToken)
{
Argument.AssertNotClosed(IsDisposed, nameof(ServiceBusReceiver));
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
ServiceBusEventSource.Log.PeekMessageStart(Identifier, sequenceNumber, maxMessages);
IList <ServiceBusReceivedMessage> messages = null;
try
{
messages = await InnerReceiver.PeekBatchAtAsync(
sequenceNumber,
maxMessages,
cancellationToken)
.ConfigureAwait(false);
}
catch (Exception exception)
{
ServiceBusEventSource.Log.PeekMessageException(Identifier, exception);
throw;
}
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
ServiceBusEventSource.Log.PeekMessageComplete(Identifier, maxMessages);
return(messages);
}
/// <summary>
/// Fetches the next batch of active messages without changing the state of the receiver or the message source.
/// </summary>
/// <param name="sequenceNumber">The sequence number from where to peek the message.</param>
/// <param name="maxMessages">The maximum number of messages that will be fetched.</param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
/// <returns>An <see cref="IList{ServiceBusReceivedMessage}" /> of messages that were peeked.</returns>
private async Task <IList <ServiceBusReceivedMessage> > PeekBatchAtInternalAsync(
long?sequenceNumber,
int maxMessages,
CancellationToken cancellationToken)
{
Argument.AssertNotClosed(IsDisposed, nameof(ServiceBusReceiver));
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
Logger.PeekMessageStart(Identifier, sequenceNumber, maxMessages);
using DiagnosticScope scope = _scopeFactory.CreateScope(
DiagnosticProperty.PeekActivityName,
requestedMessageCount: maxMessages);
scope.Start();
IList <ServiceBusReceivedMessage> messages = new List <ServiceBusReceivedMessage>();
try
{
messages = await InnerReceiver.PeekBatchAtAsync(
sequenceNumber,
maxMessages,
cancellationToken)
.ConfigureAwait(false);
}
catch (Exception exception)
{
Logger.PeekMessageException(Identifier, exception.ToString());
scope.Failed(exception);
throw;
}
Logger.PeekMessageComplete(Identifier, messages.Count);
scope.SetMessageData(messages);
return(messages);
}