protected override async Task <IList <EventData> > OnReceiveAsync(int maxMessageCount, TimeSpan waitTime)
{
bool shouldRetry;
int retryCount = 0;
var timeoutHelper = new TimeoutHelper(waitTime, true);
do
{
shouldRetry = false;
try
{
try
{
// Always use default timeout for AMQP sesssion.
ReceivingAmqpLink receiveLink =
await this.ReceiveLinkManager.GetOrCreateAsync(
TimeSpan.FromSeconds(AmqpClientConstants.AmqpSessionTimeoutInSeconds)).ConfigureAwait(false);
IEnumerable <AmqpMessage> amqpMessages = null;
bool hasMessages = await Task.Factory.FromAsync(
(c, s) => receiveLink.BeginReceiveMessages(maxMessageCount, timeoutHelper.RemainingTime(), c, s),
a => receiveLink.EndReceiveMessages(a, out amqpMessages),
this).ConfigureAwait(false);
if (receiveLink.TerminalException != null)
{
throw receiveLink.TerminalException;
}
if (hasMessages && amqpMessages != null)
{
IList <EventData> eventDatas = null;
foreach (var amqpMessage in amqpMessages)
{
if (eventDatas == null)
{
eventDatas = new List <EventData>();
}
receiveLink.DisposeDelivery(amqpMessage, true, AmqpConstants.AcceptedOutcome);
eventDatas.Add(AmqpMessageConverter.AmqpMessageToEventData(amqpMessage));
}
return(eventDatas);
}
}
catch (AmqpException amqpException)
{
throw AmqpExceptionHelper.ToMessagingContract(amqpException.Error);
}
}
catch (Exception ex)
{
// Evaluate retry condition?
TimeSpan?retryInterval = this.RetryPolicy.GetNextRetryInterval(ex, timeoutHelper.RemainingTime(), ++retryCount);
if (retryInterval != null && !this.EventHubClient.IsClosed)
{
await Task.Delay(retryInterval.Value).ConfigureAwait(false);
shouldRetry = true;
}
else
{
// Handle EventHubsTimeoutException explicitly.
// We don't really want to to throw EventHubsTimeoutException on this call.
if (ex is EventHubsTimeoutException)
{
break;
}
throw;
}
}
} while (shouldRetry);
// No messages to deliver.
return(null);
}
protected override async Task <IList <EventData> > OnReceiveAsync(int maxMessageCount, TimeSpan waitTime)
{
bool shouldRetry;
var timeoutHelper = new TimeoutHelper(waitTime, true);
do
{
shouldRetry = false;
try
{
try
{
ReceivingAmqpLink receiveLink = await this.ReceiveLinkManager.GetOrCreateAsync(timeoutHelper.RemainingTime()).ConfigureAwait(false);
IEnumerable <AmqpMessage> amqpMessages = null;
bool hasMessages = await Task.Factory.FromAsync(
(c, s) => receiveLink.BeginReceiveMessages(maxMessageCount, timeoutHelper.RemainingTime(), c, s),
a => receiveLink.EndReceiveMessages(a, out amqpMessages),
this).ConfigureAwait(false);
if (receiveLink.TerminalException != null)
{
throw receiveLink.TerminalException;
}
this.EventHubClient.RetryPolicy.ResetRetryCount(this.ClientId);
if (hasMessages && amqpMessages != null)
{
IList <EventData> eventDatas = null;
foreach (var amqpMessage in amqpMessages)
{
if (eventDatas == null)
{
eventDatas = new List <EventData>();
}
receiveLink.DisposeDelivery(amqpMessage, true, AmqpConstants.AcceptedOutcome);
eventDatas.Add(AmqpMessageConverter.AmqpMessageToEventData(amqpMessage));
}
return(eventDatas);
}
}
catch (AmqpException amqpException)
{
throw AmqpExceptionHelper.ToMessagingContract(amqpException.Error);
}
}
catch (Exception ex)
{
// Evaluate retry condition?
this.EventHubClient.RetryPolicy.IncrementRetryCount(this.ClientId);
TimeSpan?retryInterval = this.EventHubClient.RetryPolicy.GetNextRetryInterval(this.ClientId, ex, timeoutHelper.RemainingTime());
if (retryInterval != null)
{
await Task.Delay(retryInterval.Value).ConfigureAwait(false);
shouldRetry = true;
}
else
{
throw;
}
}
} while (shouldRetry);
// No messages to deliver.
return(null);
}
