public IOperationDataStream GetCopyState(long upToSequenceNumber, IOperationDataStream copyContext)
{
LogMessage(nameof(GetCopyState));
var startData = copyContext.GetNextAsync(CancellationToken.None).GetAwaiter().GetResult();
var startLsn = BitConverter.ToInt64(startData[0].Array, 0);
return(new CopyStateOperationStream(log, startLsn, upToSequenceNumber));
}
/// <summary>
/// Gets operation data from state providers.
/// </summary>
public async Task <OperationData> GetNextAsync(CancellationToken cancellationToken)
{
try
{
while (this.currentIndex < this.operationDataStreamCollection.Count)
{
StateProviderIdentifier stateProviderIdentifier = this.operationDataStreamCollection[this.currentIndex].Item1;
IOperationDataStream operationDataStream = this.operationDataStreamCollection[this.currentIndex].Item2;
OperationData operationData = await operationDataStream.GetNextAsync(cancellationToken).ConfigureAwait(false);
if (operationData == null)
{
++this.currentIndex;
continue;
}
// Reserve the List space with expected size: Version, ID, OperationData
List <ArraySegment <byte> > namedBytes = new List <ArraySegment <byte> >(2 + operationData.Count);
byte[] versionAsBytes = BitConverter.GetBytes(this.version);
namedBytes.Add(new ArraySegment <byte>(versionAsBytes));
long stateProviderId = stateProviderIdentifier.StateProviderId;
byte[] idAsBytes = BitConverter.GetBytes(stateProviderId);
namedBytes.Add(new ArraySegment <byte>(idAsBytes));
foreach (ArraySegment <byte> roll in operationData)
{
namedBytes.Add(roll);
}
return(new OperationData(namedBytes));
}
FabricEvents.Events.NamedOperationDataCollectionGetNext(this.traceType);
return(null);
}
catch (Exception e)
{
string msg = string.Format(
CultureInfo.InvariantCulture,
"OperationDataStreamCollection Count: {0}, CurrentIndex: {1}.",
this.operationDataStreamCollection.Count,
this.currentIndex);
StateManagerStructuredEvents.TraceException(
this.traceType,
"NamedOperationDataCollection.GetNextAsync.",
msg,
e);
throw;
}
}
