public async Task <StreamHandshakeToken> DeliverItem(object item, StreamSequenceToken currentToken, StreamHandshakeToken handshakeToken)
{
if (expectedToken != null)
{
if (!expectedToken.Equals(handshakeToken))
{
return(expectedToken);
}
}
await NextItem(item, currentToken);
// check again, in case the expectedToken was changed indiretly via ResumeAsync()
if (expectedToken != null)
{
if (!expectedToken.Equals(handshakeToken))
{
return(expectedToken);
}
}
expectedToken = StreamHandshakeToken.CreateDeliveyToken(currentToken);
return(null);
}
public async Task <StreamHandshakeToken> DeliverBatch(IBatchContainer batch, StreamHandshakeToken handshakeToken)
{
// we validate expectedToken only for ordered (rewindable) streams
if (expectedToken != null)
{
if (!expectedToken.Equals(handshakeToken))
{
return(expectedToken);
}
}
if (batch is IBatchContainerBatch)
{
var batchContainerBatch = batch as IBatchContainerBatch;
await NextBatch(batchContainerBatch);
}
else
{
foreach (var itemTuple in batch.GetEvents <T>())
{
await NextItem(itemTuple.Item1, itemTuple.Item2);
}
}
if (IsRewindable)
{
expectedToken = StreamHandshakeToken.CreateDeliveyToken(batch.SequenceToken);
}
return(null);
}
private async Task DeliverBatchToConsumer(StreamConsumerData consumerData, IBatchContainer batch)
{
StreamHandshakeToken prevToken = consumerData.LastToken;
Task<StreamHandshakeToken> batchDeliveryTask;
bool isRequestContextSet = batch.ImportRequestContext();
try
{
batchDeliveryTask = consumerData.StreamConsumer.DeliverBatch(consumerData.SubscriptionId, batch.AsImmutable(), prevToken);
}
finally
{
if (isRequestContextSet)
{
// clear RequestContext before await!
RequestContext.Clear();
}
}
StreamHandshakeToken newToken = await batchDeliveryTask;
if (newToken != null)
{
consumerData.LastToken = newToken;
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid,
consumerData.StreamId.Namespace, newToken.Token);
}
else
{
consumerData.LastToken = StreamHandshakeToken.CreateDeliveyToken(batch.SequenceToken); // this is the currently delivered token
}
}
private async Task <StreamHandshakeToken> DeliverBatchToConsumer(StreamConsumerData consumerData, IBatchContainer batch)
{
try
{
StreamHandshakeToken newToken = await ContextualizedDeliverBatchToConsumer(consumerData, batch);
consumerData.LastToken = StreamHandshakeToken.CreateDeliveyToken(batch.SequenceToken); // this is the currently delivered token
return(newToken);
}
catch (Exception ex)
{
this.logger.LogWarning(ex, "Failed to deliver message to consumer on {SubscriptionId} for stream {StreamId}, may retry.", consumerData.SubscriptionId, consumerData.StreamId);
throw;
}
}
public async Task <StreamHandshakeToken> DeliverBatch(IBatchContainer batch, StreamHandshakeToken handshakeToken)
{
if (expectedToken != null)
{
if (!expectedToken.Equals(handshakeToken))
{
return(expectedToken);
}
}
foreach (var itemTuple in batch.GetEvents <T>())
{
await NextItem(itemTuple.Item1, itemTuple.Item2);
}
expectedToken = StreamHandshakeToken.CreateDeliveyToken(batch.SequenceToken);
return(null);
}
public async Task <StreamHandshakeToken> DeliverItem(object item, StreamSequenceToken currentToken, StreamHandshakeToken handshakeToken)
{
if (this.expectedToken != null)
{
if (!this.expectedToken.Equals(handshakeToken))
{
return(this.expectedToken);
}
}
T typedItem;
try
{
typedItem = (T)item;
}
catch (InvalidCastException)
{
// We got an illegal item on the stream -- close it with a Cast exception
throw new InvalidCastException("Received an item of type " + item.GetType().Name + ", expected " + typeof(T).FullName);
}
await((this.observer != null)
? NextItem(typedItem, currentToken)
: NextItems(new[] { Tuple.Create(typedItem, currentToken) }));
// check again, in case the expectedToken was changed indiretly via ResumeAsync()
if (this.expectedToken != null)
{
if (!this.expectedToken.Equals(handshakeToken))
{
return(this.expectedToken);
}
}
if (IsRewindable)
{
this.expectedToken = StreamHandshakeToken.CreateDeliveyToken(currentToken);
}
return(null);
}
private async Task<StreamHandshakeToken> DeliverBatchToConsumer(StreamConsumerData consumerData, IBatchContainer batch)
{
StreamHandshakeToken prevToken = consumerData.LastToken;
Task<StreamHandshakeToken> batchDeliveryTask;
bool isRequestContextSet = batch.ImportRequestContext();
try
{
batchDeliveryTask = consumerData.StreamConsumer.DeliverBatch(consumerData.SubscriptionId, batch.AsImmutable(), prevToken);
}
finally
{
if (isRequestContextSet)
{
// clear RequestContext before await!
RequestContext.Clear();
}
}
StreamHandshakeToken newToken = await batchDeliveryTask;
consumerData.LastToken = StreamHandshakeToken.CreateDeliveyToken(batch.SequenceToken); // this is the currently delivered token
return newToken;
}