Physics Simulation       Lecture 15A DataMonitorDesign Processing Steps Run DataMonitor DataClientApplet DataServer DataSender DataClient DataReader Lectures 1A: Introduction 1B: Java Intro 2A: BuildingBlocks 2B: Objects 3A: More Objects 3B: Exceptions        & Threads 4A: Waves 4B: Nuclear &        Particle 5A: AWT 5B: More AWT       & Graphics 6A:Detectors &       Simulation 6B: LHC/Atlas &      RandomSims     7A: Swing 7B: Java2D 8A: Java Apps 8B: Dialogs &     MoreClasses 9A: Java I/O 9B: Utilities,         Unicode 10A: More     Threading 10B: File     Handling 11A: Array,Print,     Images 11B: SimplePhysics     Simulation 12A: Tips &     Techniques 12B: More Tips &     Techniques 13A: Satellite     Simulations 13B: Intro to Java     Networking 14A: Java Servers 14B: HTTP Server 15A: ServerClient 15B: ServerClient    Expt.Simulation 16A: Course           Review 16B: ExerciseTest         Discussion     Contacts     Description     Exercises     Index     Outline     Q&A     Resources     StudentInfoForm     Student Pages     What's New

Home : Lectures : Lecture 15A : DataReader DataReader DataSender is the Thread subclass that DataServer uses to service the clients. DataReader Class (in DataClient.java) //***************************************************************** // This thread class used to monitor the connection to the // DataServer. It periodically requests data from the server and // then has DataClient update its display. class DataReader extends Thread   {     String net_line = "";     boolean keepRunning = true;     DataClient c;     //-------------------------------------------------------------     public DataReader(DataClient c) {       this.c = c;     }    //--------------------------------------------------------------     public void run() {       String dataString="";       String histDataString;       // This loops until either the connection is broken or the       // stop button or stop key is hit       while (keepRunning) {         // Ask the server to send data.         try{           c.write_net_output_line("send data");         }catch (IOException e){           break;         }         // First number sent from server is an integer that gives         // the number of data values to be sent.         try{           c.numData = c.read_net_input_int();         }catch (IOException e){break;}         dataString = "Number data pts= " + c.numData + "\n";         System.out.println(dataString);         histDataString = "";         // Create an array to hold the data and then read in the         // values from the server.         c.data = new float[c.numData];         for( int i=0; i < c.numData; i++){           try{             c.data[i] = c.read_net_input_float();             // Pass the data for the monitored channel to the             // histogram.             if(i == c.monitorChan) c.hist.setData(c.data[i]);           }catch (IOException e){break;}           // BarChart needs data in string form so convert here.           int j=((int)c.data[i]);           dataString +=  c.data[i] + " ";           histDataString += j + " ";         }         // Set the data for the TextArea, the event chart.         c.data_line = dataString + "\n";         c.chart.setData(histDataString);         // Now repaint the display.         c.repaint();         // Ask for data every TimeUpdate         try {           Thread.sleep(c.TimeUpdate);         } catch (InterruptedException e)         {}       }       c.data_line = dataString + "\n";       c.msg_line = "disconnected";       c.repaint();     }   }

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