public async Task <List <Envelope> > GetUnprocessed(string route, CancellationToken cancellationToken)
{
var threshold = DateTime.UtcNow - _messagingConfiguration.ResendThreshold;
var collection = _mongoAgent.GetEnvelops(route);
var notProcessedQuery = Query.And(
Query <Envelope> .LT(x => x.ReadAt, threshold),
Query <Envelope> .EQ(x => x.IsRead, true),
Query <Envelope> .EQ(x => x.IsProcessed, false)
);
var notProcessed = collection.Find(notProcessedQuery).ToList();
_messagingLogger.Debug($"got {notProcessed.Count} unprocessed messages to resend");
return(notProcessed);
}
public async Task <bool> TrySetProcessingStartedAt(string route, string messageId, CancellationToken cancellationToken)
{
var collection = _mongoAgent.GetEnvelops(route);
var query = Query.And(Query <Envelope> .EQ(x => x.Id, messageId), Query <Envelope> .EQ(x => x.IsProcessed, false));
var update = Update <Envelope> .Set(x => x.ProcessingStartedAt, DateTime.UtcNow).Set(x => x.IsProcessingStarted, true);
var result = collection.FindAndModify(new FindAndModifyArgs
{
Query = query,
Update = update,
VersionReturned = FindAndModifyDocumentVersion.Modified,
Upsert = false,
});
return(result.ModifiedDocument != null);
}
public async Task Listen(string route, CancellationToken cancellationToken)
{
var notReadQuery = Query <Envelope> .EQ(x => x.IsRead, false);
var collection = _mongoAgent.GetEnvelops(route);
try
{
while (true)
{
var messages = collection.Find(notReadQuery).ToList();
foreach (var envelope in messages)
{
var readMessage = await _messageStatusManager.TrySetReadAt(route, envelope.Id, cancellationToken);
if (readMessage != null)
{
var resend = readMessage.OriginalId != IdGenerator.Empty;
_messageProcessor.Process(route, readMessage.Id, readMessage.Topic, readMessage.Payload, resend, cancellationToken);
}
}
if (!messages.Any())
{
await Task.Delay(100, cancellationToken);
}
}
}
catch (MongoCommandException mongoCommandException)
{
if (mongoCommandException.Code == 96)
{
_messagingLogger.Error(mongoCommandException,
$"{route} reader processes messages slower than they occur");
}
else
{
_messagingLogger.Error(mongoCommandException, $"{route}");
}
}
}
public void PublishToSubscriber(string subscriberName, string topic, string payload, Ack ack = Ack.Master)
{
var collection = _mongoAgent.GetEnvelops(subscriberName);
collection.Insert(new Envelope(topic, payload), ack.ToWriteConcern());
}
public void PublishToSubscriber(string subscriberName, string topic, string payload)
{
var collection = _mongoAgent.GetEnvelops(subscriberName);
collection.Insert(new Envelope(topic, payload));
}