Source Code of it.polito.appeal.traci.examples.TcpNoDelayControl

/*   
    Copyright (C) 2013 ApPeAL Group, Politecnico di Torino


    This file is part of TraCI4J.


    TraCI4J is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.


    TraCI4J is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.


    You should have received a copy of the GNU General Public License
    along with TraCI4J.  If not, see <http://www.gnu.org/licenses/>.
*/


package it.polito.appeal.traci.examples;


import it.polito.appeal.traci.SumoTraciConnection;


import java.util.ArrayList;


import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Priority;


/**
 * Based on the OpenStepsClose example. Shows how to control the TCP_NODELAY
 * setting, which can be a problem for Linux platforms.
 * 
 * @author Enrico Gueli &lt;enrico.gueli@polito.it&gt;
 * <br/>with modifications by Mardi &lt;mardi.rmit@gmail.com&gt;
 * 
 */
public class TcpNoDelayControl {


  /** main method */
  public static void main(String[] args)
  {
     /*
      * Removes the debug log messages from console output 
      */
     ConsoleAppender ca = new ConsoleAppender();
    ca.setThreshold(Priority.WARN);
    BasicConfigurator.configure(ca);
    
    SumoTraciConnection conn = new SumoTraciConnection(
        "test/sumo_maps/box1l/test.sumo.cfg",  // config file
        12345                                  // random seed
        );
    


    /*
     * Sets the TCP_NODELAY property on the socket connection to SUMO based
     * on the OS we are executing in.
     */
    String os = System.getProperty("os.name");
    if(os.matches("Linux"))
    {
       conn.enableTcpNoDelay();
    }
    else
    {
       conn.disableTcpNoDelay();
    }
    
    
    /*
     * Just some simple checking code. 
     */
    boolean check = conn.isTcpNoDelayActive();
    
    System.out.println();
    System.out.printf("Setting TcpNoDelay to [%b] as we are in %s\n", check, os);
    
    
    /*
     * For calculating mean execution times.
     */
    ArrayList<Long> val = new ArrayList<Long>();
    
    try
    {
       /*
        * If we did not want to depend on the OS, we can simply override the
        * TCP_NODELAY setting by doing conn.setTcpNoDelay(false) here.  
        */
       // conn.setTcpNoDelay(false);
      conn.runServer();
      
      System.out.println();
      System.out.println("Map bounds are: " + conn.queryBounds());
      System.out.println();
      
      int i;
            
      for (i = 0; i < 20; i++)
      {
        int time = conn.getCurrentSimStep();
        
         long bgn;
         long end;
         long dif;
         
         bgn = System.currentTimeMillis();
        conn.nextSimStep();
        end = System.currentTimeMillis();
        dif = end - bgn;
        
        System.out.println();
        System.out.printf("Begin Time: %s ms\n", bgn);
        System.out.printf("End Time  : %s ms\n", end);
        System.out.printf("Tick %03d : %d ms\n", time, dif);
        val.add(dif);
      }
      
      double sum = 0;
      
      for(Long l : val)
      {
         sum += l;
      }
      
      double avg = sum / (double)val.size();
      
      System.out.println();
      System.out.printf("Average: %.2f ms for %d ticks, with tcpnodelay=%b\n", avg, i, conn.isTcpNoDelayActive());
      
      conn.close();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
}
Source Code of it.polito.appeal.traci.examples.TcpNoDelayControl

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