/// <summary> /// Provides overriden implementation for Main Loop Service method. Reflects associated IPort ConnState changes into this object. /// Services the underlying port read and port write actions to implement the basic functionality of this object. /// </summary> protected override void PerformMainLoopService() { System.Threading.Thread.Sleep(1); IBaseState portBaseState = portBaseStateObserver.Object; if (portBaseStateObserver.IsUpdateNeeded) { portBaseStateObserver.Update(); IBaseState updatedBaseState = portBaseStateObserver.Object; if (updatedBaseState.ConnState != BaseState.ConnState) { SetBaseState(updatedBaseState.ConnState, "Port ConnState changed", true); } portBaseState = updatedBaseState; } if (portBaseState.IsConnected) { if (portRdAction.ActionState.IsComplete && portRdActionParam.ActionResultEnum != ActionResultEnum.None) { if (portRdActionParam.BytesRead > 0 && portWrAction.ActionState.CanStart) { portRdActionParam.ActionResultEnum = ActionResultEnum.None; portWrActionParam.BytesToWrite = portRdActionParam.BytesRead; portWrAction.Start(); } } else if (portWrAction.ActionState.IsComplete && portWrActionParam.ActionResultEnum != ActionResultEnum.None) { portWrActionParam.ActionResultEnum = ActionResultEnum.None; portRdAction.Start(); } else if (portRdAction.ActionState.CanStart && portWrAction.ActionState.CanStart) { portWrActionParam.Reset(); portRdAction.Start(); } } }
/// <summary> /// Provides the server specific version of the Part's Main Loop Service method. /// </summary> protected override void PerformMainLoopService() { base.PerformMainLoopService(); InnerServiceFCServerAndStateRelay(); bool portIsConnected = portBaseStateObserver.Object.IsConnected; if (portWriteAction.ActionState.IsPendingCompletion || portFlushAction.ActionState.IsPendingCompletion || portReinitializeAction.ActionState.IsPendingCompletion) { // we cannot service a new request until the write, flush, and/or reinitialize actions started in any prior service loop have completed. return; } bool resyncCommandStream = false; bool startWrite = false; if (portIsConnected && portReadAction.ActionState.CanStart) { if (portReadAction.ActionState.IsComplete) { serverFunctionContainer.requestAdu.PktBuf.numBytes = portReadActionParam.BytesRead; string ec = null; TimeSpan bufferAge = bufferFillStartTime.Age; if (serverFunctionContainer.AttemptToDecodeRequestPkt(out ec)) { if (String.IsNullOrEmpty(ec)) { Log.Trace.Emit("Attempting to perform request ADU:{0}", serverFunctionContainer.requestAdu); if (serverFunctionContainer.ServiceDecodedRequest(fcServer)) { startWrite = true; } else { Log.Trace.Emit("Decoded request produced no response [ADU:{0}]", serverFunctionContainer.requestAdu); } } else { Log.Error.Emit("Invalid request received: {0} [numBytes:{1}]", ec, portReadActionParam.BytesRead); resyncCommandStream = true; } portReadActionParam.BytesRead = 0; } else if (portReadActionParam.BytesRead > 0) { if (port.PortBehavior.IsDatagramPort) { Log.Warning.Emit("Invalid partial request received from datagram port. Discarding {0} bytes", portReadActionParam.BytesRead); portReadActionParam.BytesRead = 0; } else if (bufferAge > Timeout) { Log.Warning.Emit("Incomplete Partial Request timeout after {0:f3} seconds. Discarding {0} bytes", bufferAge.TotalSeconds, portReadActionParam.BytesRead); portReadActionParam.BytesRead = 0; } } else { Log.Trace.Emit("Empty read completed"); } } if (!resyncCommandStream) { // start the read immediately even if we are also starting a write (keep the interface primed) // do not start the next read if we need to resync the command stream if (portReadActionParam.BytesRead == 0) { bufferFillStartTime = QpcTimeStamp.Now; } if (portReadActionParam.Buffer == null) { portReadActionParam.Buffer = serverFunctionContainer.requestAdu.PktBuf.bytes; portReadActionParam.BytesToRead = serverFunctionContainer.requestAdu.PktBuf.bytes.Length; } portReadAction.Start(); } } else if (portReadAction.ActionState.IsComplete && portReadActionParam.BytesRead > 0) { Log.Debug.Emit("Discarding {0} bytes of read data: port is no longer connected"); portReadActionParam.BytesRead = 0; } if (!portIsConnected) { } else if (startWrite) { Log.Trace.Emit("Writing response ADU:{0}", serverFunctionContainer.responseAdu); portWriteActionParam.Buffer = serverFunctionContainer.responseAdu.PktBuf.bytes; portWriteActionParam.BytesToWrite = serverFunctionContainer.responseAdu.PktBuf.numBytes; portWriteActionParam.BytesWritten = 0; portWriteAction.Start(); } else if (resyncCommandStream) { IPortBehavior portBehavior = port.PortBehavior; if (portBehavior.IsDatagramPort) { // there is nothing to do for datagram ports. // Each message is a seperate item so there is no "leftover" bytes from prior requests that we might need to get rid of. } else if (portBehavior.IsByteStreamPort && portBehavior.IsNetworkPort) { Log.Debug.Emit("Forcing port to reset current connection after protocol decode error (drop and immediately reconnect)"); portReinitializeAction.Start(); } else { portFlushAction.Start(); } } }