/// <summary>
/// Receives a batch of <see cref="ServiceBusMessage" /> from the Service Bus entity partition.
/// </summary>
///
/// <param name="maximumMessageCount">The maximum number of messages to receive in this batch.</param>
/// <param name="timeout"></param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
///
/// <returns>The batch of <see cref="ServiceBusMessage" /> from the Service Bus entity partition this consumer is associated with. If no events are present, an empty enumerable is returned.</returns>
///
internal async Task <IEnumerable <ServiceBusMessage> > ReceiveAsyncInternal(
int maximumMessageCount,
TimeSpan timeout,
CancellationToken cancellationToken)
{
Argument.AssertNotClosed(_closed, nameof(AmqpConsumer));
Argument.AssertAtLeast(maximumMessageCount, 1, nameof(maximumMessageCount));
var link = default(ReceivingAmqpLink);
var amqpMessages = default(IEnumerable <AmqpMessage>);
var receivedMessages = default(List <ServiceBusMessage>);
var stopWatch = Stopwatch.StartNew();
ServiceBusEventSource.Log.MessageReceiveStart(EntityName);
link = await ReceiveLink.GetOrCreateAsync(UseMinimum(ConnectionScope.SessionTimeout, timeout)).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
var messagesReceived = await Task.Factory.FromAsync
(
(callback, state) => link.BeginReceiveRemoteMessages(maximumMessageCount, TimeSpan.FromMilliseconds(20), timeout, callback, state),
(asyncResult) => link.EndReceiveMessages(asyncResult, out amqpMessages),
TaskCreationOptions.RunContinuationsAsynchronously
).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
// If event messages were received, then package them for consumption and
// return them.
if ((messagesReceived) && (amqpMessages != null))
{
receivedMessages = new List <ServiceBusMessage>();
foreach (AmqpMessage message in amqpMessages)
{
if (_receiveMode == ReceiveMode.ReceiveAndDelete)
{
link.DisposeDelivery(message, true, AmqpConstants.AcceptedOutcome);
}
receivedMessages.Add(AmqpMessageConverter.AmqpMessageToSBMessage(message));
// message.Dispose();
}
stopWatch.Stop();
return(receivedMessages);
}
stopWatch.Stop();
// No events were available.
return(Enumerable.Empty <ServiceBusMessage>());
}
/// <summary>
/// Receives a batch of <see cref="ServiceBusMessage" /> from the Service Bus entity partition.
/// </summary>
///
/// <param name="maximumMessageCount">The maximum number of messages to receive in this batch.</param>
/// <param name="maximumWaitTime">The maximum amount of time to wait to build up the requested message count for the batch; if not specified, the per-try timeout specified by the retry policy will be used.</param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
///
/// <returns>The batch of <see cref="ServiceBusMessage" /> from the Service Bus entity partition this consumer is associated with. If no events are present, an empty enumerable is returned.</returns>
///
public override async Task <IEnumerable <ServiceBusMessage> > ReceiveAsync(
int maximumMessageCount,
TimeSpan?maximumWaitTime,
CancellationToken cancellationToken)
{
Argument.AssertNotClosed(_closed, nameof(AmqpConsumer));
Argument.AssertAtLeast(maximumMessageCount, 1, nameof(maximumMessageCount));
var receivedMessageCount = 0;
var failedAttemptCount = 0;
var tryTimeout = _retryPolicy.CalculateTryTimeout(0);
var waitTime = (maximumWaitTime ?? tryTimeout);
var link = default(ReceivingAmqpLink);
var retryDelay = default(TimeSpan?);
var amqpMessages = default(IEnumerable <AmqpMessage>);
var receivedMessages = default(List <ServiceBusMessage>);
var stopWatch = Stopwatch.StartNew();
try
{
while (!cancellationToken.IsCancellationRequested)
{
try
{
ServiceBusEventSource.Log.MessageReceiveStart(EntityName);
link = await ReceiveLink.GetOrCreateAsync(UseMinimum(ConnectionScope.SessionTimeout, tryTimeout)).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
var messagesReceived = await Task.Factory.FromAsync
(
(callback, state) => link.BeginReceiveRemoteMessages(maximumMessageCount, TimeSpan.FromMilliseconds(20), waitTime, callback, state),
(asyncResult) => link.EndReceiveMessages(asyncResult, out amqpMessages),
TaskCreationOptions.RunContinuationsAsynchronously
).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
// If event messages were received, then package them for consumption and
// return them.
if ((messagesReceived) && (amqpMessages != null))
{
receivedMessages ??= new List <ServiceBusMessage>();
foreach (AmqpMessage message in amqpMessages)
{
//link.DisposeDelivery(message, true, AmqpConstants.AcceptedOutcome);
receivedMessages.Add(AmqpMessageConverter.AmqpMessageToSBMessage(message));
message.Dispose();
}
receivedMessageCount = receivedMessages.Count;
return(receivedMessages);
}
// No events were available.
return(Enumerable.Empty <ServiceBusMessage>());
}
catch (ServiceBusException ex) when(ex.Reason == ServiceBusException.FailureReason.ServiceTimeout)
{
// Because the timeout specified with the request is intended to be the maximum
// amount of time to wait for events, a timeout isn't considered an error condition,
// rather a sign that no events were available in the requested period.
return(Enumerable.Empty <ServiceBusMessage>());
}
catch (Exception ex)
{
Exception activeEx = ex.TranslateServiceException(EntityName);
// Determine if there should be a retry for the next attempt; if so enforce the delay but do not quit the loop.
// Otherwise, bubble the exception.
++failedAttemptCount;
retryDelay = _retryPolicy.CalculateRetryDelay(activeEx, failedAttemptCount);
if ((retryDelay.HasValue) && (!ConnectionScope.IsDisposed) && (!cancellationToken.IsCancellationRequested))
{
ServiceBusEventSource.Log.MessageReceiveError(EntityName, activeEx.Message);
await Task.Delay(UseMinimum(retryDelay.Value, waitTime.CalculateRemaining(stopWatch.Elapsed)), cancellationToken).ConfigureAwait(false);
tryTimeout = _retryPolicy.CalculateTryTimeout(failedAttemptCount);
}
else if (ex is AmqpException)
{
throw activeEx;
}
else
{
throw;
}
}
}
// If no value has been returned nor exception thrown by this point,
// then cancellation has been requested.
throw new TaskCanceledException();
}
catch (Exception ex)
{
ServiceBusEventSource.Log.MessageReceiveError(EntityName, ex.Message);
throw;
}
finally
{
stopWatch.Stop();
ServiceBusEventSource.Log.MessageReceiveComplete(EntityName, receivedMessageCount);
}
}
/// <summary>
///
/// </summary>
/// <param name="retryPolicy"></param>
/// <param name="fromSequenceNumber"></param>
/// <param name="messageCount"></param>
/// <param name="sessionId"></param>
/// <param name="receiveLinkName"></param>
/// <param name="timeout"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
internal async Task <IEnumerable <ServiceBusMessage> > PeekInternal(
ServiceBusRetryPolicy retryPolicy,
long?fromSequenceNumber,
int messageCount,
string sessionId,
string receiveLinkName,
TimeSpan timeout,
CancellationToken cancellationToken = default)
{
var stopWatch = new Stopwatch();
stopWatch.Start();
AmqpRequestMessage amqpRequestMessage = AmqpRequestMessage.CreateRequest(
ManagementConstants.Operations.PeekMessageOperation,
timeout,
null);
await AquireAccessTokenAsync(cancellationToken).ConfigureAwait(false);
if (receiveLinkName != null)
{
// include associated link for service optimization
amqpRequestMessage.AmqpMessage.ApplicationProperties.Map[ManagementConstants.Request.AssociatedLinkName] = receiveLinkName;
}
amqpRequestMessage.Map[ManagementConstants.Properties.FromSequenceNumber] = fromSequenceNumber ?? LastPeekedSequenceNumber + 1;
amqpRequestMessage.Map[ManagementConstants.Properties.MessageCount] = messageCount;
if (!string.IsNullOrWhiteSpace(sessionId))
{
amqpRequestMessage.Map[ManagementConstants.Properties.SessionId] = sessionId;
}
RequestResponseAmqpLink link = await ManagementLink.GetOrCreateAsync(
UseMinimum(ConnectionScope.SessionTimeout,
timeout.CalculateRemaining(stopWatch.Elapsed)))
.ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
using AmqpMessage responseAmqpMessage = await link.RequestAsync(
amqpRequestMessage.AmqpMessage,
timeout.CalculateRemaining(stopWatch.Elapsed))
.ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
AmqpResponseMessage amqpResponseMessage = AmqpResponseMessage.CreateResponse(responseAmqpMessage);
var messages = new List <ServiceBusMessage>();
//AmqpError.ThrowIfErrorResponse(responseAmqpMessage, EntityName);
if (amqpResponseMessage.StatusCode == AmqpResponseStatusCode.OK)
{
ServiceBusMessage message = null;
IEnumerable <AmqpMap> messageList = amqpResponseMessage.GetListValue <AmqpMap>(ManagementConstants.Properties.Messages);
foreach (AmqpMap entry in messageList)
{
var payload = (ArraySegment <byte>)entry[ManagementConstants.Properties.Message];
var amqpMessage = AmqpMessage.CreateAmqpStreamMessage(new BufferListStream(new[] { payload }), true);
message = AmqpMessageConverter.AmqpMessageToSBMessage(amqpMessage, true);
messages.Add(message);
}
if (message != null)
{
LastPeekedSequenceNumber = message.SystemProperties.SequenceNumber;
}
return(messages);
}
if (amqpResponseMessage.StatusCode == AmqpResponseStatusCode.NoContent ||
(amqpResponseMessage.StatusCode == AmqpResponseStatusCode.NotFound && Equals(AmqpClientConstants.MessageNotFoundError, amqpResponseMessage.GetResponseErrorCondition())))
{
return(messages);
}
// TODO throw correct exception
throw new Exception();
}
