async Task VolatileLogicalTimeManager.ISnapshotHandler.OnSnapshotAsync(TimeSpan currentLogicalTime)
{
var logicalTimedata = new LogicalTimestamp(currentLogicalTime);
var data = LogicalTimestampSerializer.Serialize(logicalTimedata);
try
{
using (var tx = this.stateManager.CreateTransaction())
{
await this.logicalTimeDictionary.AddOrUpdateAsync(tx, LogicalTimestampKey, data, (k, v) => data);
await tx.CommitAsync();
}
}
catch (FabricException)
{
// Ignore any fabric exception.
}
catch (Exception ex)
{
ActorTrace.Source.WriteErrorWithId(
TraceType,
this.traceId,
string.Format("OnSnapshotAsync() unexpected exception: {0}.", ex.ToString()));
}
}
internal static byte[] Serialize(LogicalTimestamp logicalTimestamp)
{
var dataSizeInBytes = ComputeSizeInBytes(logicalTimestamp);
using (var stream = new MemoryStream(dataSizeInBytes))
{
using (var writer = new BinaryWriter(stream, DataEncoding))
{
writer.Write(CurrentDataVersion);
if (logicalTimestamp == null)
{
writer.WriteNullPrefixByte();
}
else
{
writer.WriteNotNullPrefixByte();
writer.Write(logicalTimestamp.Timestamp);
}
writer.Flush();
return(stream.GetBuffer());
}
}
}
private static int ComputeSizeInBytes(LogicalTimestamp logicalTimestamp)
{
int size = sizeof(ushort); // Data version
size += sizeof(byte); // Null value indicator prefix
if (logicalTimestamp != null)
{
size += sizeof(long); // TimSpan
}
return(size);
}
