private IEnumerable <L7Flow> AvailableUnidirectionL7Conversations(Boolean forceCreate, TcpFlowReassembler reassembler) =>
reassembler.CompletedFlows.Where(flow => !flow.Paired)
.Where(flow => forceCreate ||
this._lastFrameTimestampTicks - flow.LastSeenTicks >= TcpSessionTimeoutTicks);
GetOrCreateTcpFlowReassemblerForFrame(ref TcpFlowReassembler flow, FlowDirection direction) => flow ?? (flow = new TcpFlowReassembler(direction));