async Task Dispatch(CapturedTransportOperation operation, RootContext rootContext)
{
using (var conn = settings.Links[operation.Destination].ConnectionFactory())
{
await conn.OpenAsync().ConfigureAwait(false);
using (var trans = conn.BeginTransaction())
{
//Will block until the record insert transaction is completed.
await OutboxPersister.MarkAsDispatched(operation, conn, trans).ConfigureAwait(false);
var iface = settings.GetDestinationInterface(operation.Destination);
var chains = rootContext.Interfaces.GetChainsFor(iface);
var chain = chains.Get <AnycastContext>();
var dispatchContext = new OutboxDispatchContext(rootContext, iface);
var forwardContext = new AnycastContext(operation.Destination, operation.OutgoingMessage, DistributionStrategyScope.Send, dispatchContext);
dispatchContext.Set(new TransportTransaction());
await chain.Invoke(forwardContext).ConfigureAwait(false);
//Only commit the transaction if the dispatch succeeded.
trans.Commit();
}
}
}
public async Task Store(CapturedTransportOperation operation, Action triggerAdvance, SqlConnection conn, SqlTransaction trans)
{
var localState = linkState;
var seq = await sequence.GetNextValue(conn, trans).ConfigureAwait(false);
InterlocedEx.ExchangeIfGreaterThan(ref highestSeq, seq);
if (localState.IsStale(seq))
{
var freshLinkState = await linkStateTable.Get(operation.Destination, conn, trans).ConfigureAwait(false);
UpdateCachedLinkState(freshLinkState);
localState = linkState;
}
if (localState.ShouldAdvance(seq))
{
triggerAdvance();
}
if (localState.IsStale(seq))
{
throw new ProcessCurrentMessageLaterException("Link state is stale. Processing current message later.");
}
var tableName = localState.GetTableName(seq);
var table = new OutboxTable(tableName);
try
{
operation.OutgoingMessage.Headers[RouterDeduplicationHeaders.SequenceNumber] = seq.ToString();
operation.OutgoingMessage.Headers[RouterDeduplicationHeaders.SequenceKey] = sourceKey;
operation.AssignTable(tableName);
operation.AssignSequence(seq);
var persistentOperation = Convert(operation);
await table.Insert(persistentOperation, seq, conn, trans).ConfigureAwait(false);
}
catch (SqlException e)
{
if (e.Number == 547) //Constraint violation. We used very old seq and that value cannot be used any more because the epoch has advanced.
{
var freshLinkState = await linkStateTable.Get(operation.Destination, conn, trans).ConfigureAwait(false);
UpdateCachedLinkState(freshLinkState);
throw new ProcessCurrentMessageLaterException("Link state is stale. Processing current message later.");
}
throw;
}
catch (Exception ex)
{
log.Debug($"Unhandled exception while storing outbox operation with sequence {seq}", ex);
throw;
}
}
public Task Store(CapturedTransportOperation operation, SqlConnection conn, SqlTransaction trans)
{
return(persisters[operation.Destination].Store(operation, conn, trans));
}
public void Enqueue(CapturedTransportOperation operation)
{
operationsQueue.Add(operation);
}
public Task Store(CapturedTransportOperation operation, SqlConnection conn, SqlTransaction trans)
{
return(persister.Store(operation, () => @event.Set(), conn, trans));
}