/// <summary>
/// Read from queue.
/// Returns true, if data was read, false if it was not
/// </summary>
/// <param name="myQueueId"></param>
/// <param name="rcvr"></param>
/// <param name="maxCacheAddCount"></param>
/// <returns></returns>
private async Task<bool> ReadFromQueue(QueueId myQueueId, IQueueAdapterReceiver rcvr, int maxCacheAddCount)
{
try
{
var now = DateTime.UtcNow;
// Try to cleanup the pubsub cache at the cadence of 10 times in the configurable StreamInactivityPeriod.
if ((now - lastTimeCleanedPubSubCache) >= config.StreamInactivityPeriod.Divide(StreamInactivityCheckFrequency))
{
lastTimeCleanedPubSubCache = now;
CleanupPubSubCache(now);
}
if (queueCache != null)
{
IList<IBatchContainer> purgedItems;
if (queueCache.TryPurgeFromCache(out purgedItems))
{
try
{
await rcvr.MessagesDeliveredAsync(purgedItems);
}
catch (Exception exc)
{
logger.Warn(ErrorCode.PersistentStreamPullingAgent_27,
$"Exception calling MessagesDeliveredAsync on queue {myQueueId}. Ignoring.", exc);
}
}
}
if (queueCache != null && queueCache.IsUnderPressure())
{
// Under back pressure. Exit the loop. Will attempt again in the next timer callback.
logger.Info((int)ErrorCode.PersistentStreamPullingAgent_24, "Stream cache is under pressure. Backing off.");
return false;
}
// Retrive one multiBatch from the queue. Every multiBatch has an IEnumerable of IBatchContainers, each IBatchContainer may have multiple events.
IList<IBatchContainer> multiBatch = await rcvr.GetQueueMessagesAsync(maxCacheAddCount);
if (multiBatch == null || multiBatch.Count == 0) return false; // queue is empty. Exit the loop. Will attempt again in the next timer callback.
queueCache?.AddToCache(multiBatch);
numMessages += multiBatch.Count;
numReadMessagesCounter.IncrementBy(multiBatch.Count);
if (logger.IsVerbose2) logger.Verbose2(ErrorCode.PersistentStreamPullingAgent_11, "Got {0} messages from queue {1}. So far {2} msgs from this queue.",
multiBatch.Count, myQueueId.ToStringWithHashCode(), numMessages);
foreach (var group in
multiBatch
.Where(m => m != null)
.GroupBy(container => new Tuple<Guid, string>(container.StreamGuid, container.StreamNamespace)))
{
var streamId = StreamId.GetStreamId(group.Key.Item1, queueAdapter.Name, group.Key.Item2);
StreamConsumerCollection streamData;
if (pubSubCache.TryGetValue(streamId, out streamData))
{
streamData.RefreshActivity(now);
StartInactiveCursors(streamData); // if this is an existing stream, start any inactive cursors
}
else
{
RegisterStream(streamId, group.First().SequenceToken, now).Ignore(); // if this is a new stream register as producer of stream in pub sub system
}
}
return true;
}
catch (Exception exc)
{
logger.Error(ErrorCode.PersistentStreamPullingAgent_28, "Exception while reading from queue.", exc);
throw;
}
}
/// <summary>
/// Read from queue.
/// Returns true, if data was read, false if it was not
/// </summary>
/// <param name="myQueueId"></param>
/// <param name="rcvr"></param>
/// <param name="maxCacheAddCount"></param>
/// <returns></returns>
private async Task <bool> ReadFromQueue(QueueId myQueueId, IQueueAdapterReceiver rcvr, int maxCacheAddCount)
{
if (rcvr == null)
{
return(false);
}
var now = DateTime.UtcNow;
// Try to cleanup the pubsub cache at the cadence of 10 times in the configurable StreamInactivityPeriod.
if ((now - lastTimeCleanedPubSubCache) >= this.options.StreamInactivityPeriod.Divide(StreamInactivityCheckFrequency))
{
lastTimeCleanedPubSubCache = now;
CleanupPubSubCache(now);
}
if (queueCache != null)
{
IList <IBatchContainer> purgedItems;
if (queueCache.TryPurgeFromCache(out purgedItems))
{
try
{
await rcvr.MessagesDeliveredAsync(purgedItems);
}
catch (Exception exc)
{
logger.LogWarning(
(int)ErrorCode.PersistentStreamPullingAgent_27,
exc,
"Exception calling MessagesDeliveredAsync on queue {MyQueueId}. Ignoring.",
myQueueId);
}
}
}
if (queueCache != null && queueCache.IsUnderPressure())
{
// Under back pressure. Exit the loop. Will attempt again in the next timer callback.
logger.LogInformation((int)ErrorCode.PersistentStreamPullingAgent_24, "Stream cache is under pressure. Backing off.");
return(false);
}
// Retrieve one multiBatch from the queue. Every multiBatch has an IEnumerable of IBatchContainers, each IBatchContainer may have multiple events.
IList <IBatchContainer> multiBatch = await rcvr.GetQueueMessagesAsync(maxCacheAddCount);
if (multiBatch == null || multiBatch.Count == 0)
{
return(false); // queue is empty. Exit the loop. Will attempt again in the next timer callback.
}
queueCache?.AddToCache(multiBatch);
numMessages += multiBatch.Count;
numReadMessagesCounter.IncrementBy(multiBatch.Count);
if (logger.IsEnabled(LogLevel.Trace))
{
logger.LogTrace(
(int)ErrorCode.PersistentStreamPullingAgent_11,
"Got {ReceivedCount} messages from queue {Queue}. So far {MessageCount} messages from this queue.",
multiBatch.Count,
myQueueId.ToStringWithHashCode(),
numMessages);
}
foreach (var group in
multiBatch
.Where(m => m != null)
.GroupBy(container => container.StreamId))
{
var streamId = new InternalStreamId(queueAdapter.Name, group.Key);
StreamSequenceToken startToken = group.First().SequenceToken;
StreamConsumerCollection streamData;
if (pubSubCache.TryGetValue(streamId, out streamData))
{
streamData.RefreshActivity(now);
if (streamData.StreamRegistered)
{
StartInactiveCursors(streamData,
startToken); // if this is an existing stream, start any inactive cursors
}
else
{
if (this.logger.IsEnabled(LogLevel.Debug))
{
this.logger.LogDebug(
$"Pulled new messages in stream {streamId} from the queue, but pulling agent haven't succeeded in" +
$"RegisterStream yet, will start deliver on this stream after RegisterStream succeeded");
}
}
}
else
{
RegisterStream(streamId, startToken, now).Ignore(); // if this is a new stream register as producer of stream in pub sub system
}
}
return(true);
}