added option to make random seed automatically generated at simulation load

+ a single random generator instance is used instead of sharing seed between different parts of the simulator

tools/cooja/java/se/sics/cooja/GUI.java

@@ -24,7 +24,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Id: GUI.java,v 1.102 2009/02/08 18:33:05 fros4943 Exp $
+ * $Id: GUI.java,v 1.103 2009/02/18 10:09:32 fros4943 Exp $
  */
 
 package se.sics.cooja;
@@ -592,7 +592,7 @@ public class GUI extends Observable {
     JMenuItem menuItem2 = new JMenuItem("same random seed");
     menuItem2.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
-        reloadCurrentSimulation(false, false);
+        reloadCurrentSimulation(false, getSimulation().getRandomSeed());
       }
     });
     menuItem.add(menuItem2);
@@ -600,7 +600,7 @@ public class GUI extends Observable {
     menuItem2 = new JMenuItem("new random seed");
     menuItem2.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
-        reloadCurrentSimulation(false, true);
+        reloadCurrentSimulation(false, getSimulation().getRandomSeed()+1);
       }
     });
     menuItem.add(menuItem2);
@@ -2389,7 +2389,7 @@ public class GUI extends Observable {
    * @param autoStart Start executing simulation when loaded
    * @param newSeed Change simulation seed
    */
-  public void reloadCurrentSimulation(final boolean autoStart, final boolean newSeed) {
+  public void reloadCurrentSimulation(final boolean autoStart, final long randomSeed) {
     if (getSimulation() == null) {
       logger.fatal("No simulation to reload");
       return;
@@ -2402,9 +2402,6 @@ public class GUI extends Observable {
         /* Get current simulation configuration */
         Element root = new Element("simconf");
         Element simulationElement = new Element("simulation");
-        if (newSeed) {
-          getSimulation().setRandomSeed(getSimulation().getRandomSeed() + 1);
-        }
 
         simulationElement.addContent(getSimulation().getConfigXML());
         root.addContent(simulationElement);
@@ -2421,6 +2418,8 @@ public class GUI extends Observable {
             myGUI.doRemoveSimulation(false);
             Simulation newSim = loadSimulationConfig(root, true);
             myGUI.setSimulation(newSim);
+            myGUI.getSimulation().setRandomSeed(randomSeed);
+
             if (autoStart) {
               newSim.startSimulation();
             }
@@ -2486,7 +2485,7 @@ public class GUI extends Observable {
    * @param autoStart Start executing simulation when loaded
    */
   public void reloadCurrentSimulation(boolean autoStart) {
-    reloadCurrentSimulation(autoStart, false);
+    reloadCurrentSimulation(autoStart, getSimulation().getRandomSeed());
   }
 
   /**

tools/cooja/java/se/sics/cooja/Simulation.java

@@ -24,7 +24,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Id: Simulation.java,v 1.37 2009/01/08 15:42:38 fros4943 Exp $
+ * $Id: Simulation.java,v 1.38 2009/02/18 10:09:59 fros4943 Exp $
  */
 
 package se.sics.cooja;
@@ -74,9 +74,11 @@ public class Simulation extends Observable implements Runnable {
 
   private long randomSeed = 123456;
 
+  private boolean randomSeedGenerated = false;
+
   private int maxMoteStartupDelay = 1000;
 
-  private Random delayMotesRandom = new Random();
+  private Random randomGenerator = new Random();
 
   // Tick observable
   private class TickObservable extends Observable {
@@ -276,7 +278,6 @@ public class Simulation extends Observable implements Runnable {
    */
   public Simulation(GUI gui) {
     myGUI = gui;
-    delayMotesRandom.setSeed(randomSeed);
   }
 
   /**
@@ -342,6 +343,26 @@ public class Simulation extends Observable implements Runnable {
    */
   public void setRandomSeed(long randomSeed) {
     this.randomSeed = randomSeed;
+    randomGenerator.setSeed(randomSeed);
+    logger.info("Simulation random seed: " + randomSeed);
+  }
+
+  /**
+   * @param generated Autogenerated random seed at simulation load
+   */
+  public void setRandomSeedGenerated(boolean generated) {
+    this.randomSeedGenerated = generated;
+  }
+
+  /**
+   * @return Autogenerated random seed at simulation load
+   */
+  public boolean getRandomSeedGenerated() {
+    return randomSeedGenerated;
+  }
+
+  public Random getRandomGenerator() {
+    return randomGenerator;
   }
 
   /**
@@ -386,7 +407,11 @@ public class Simulation extends Observable implements Runnable {
 
     // Random seed
     element = new Element("randomseed");
-    element.setText(Long.toString(randomSeed));
+    if (randomSeedGenerated) {
+      element.setText("generated");
+    } else {
+      element.setText(Long.toString(getRandomSeed()));
+    }
     config.add(element);
 
     // Max mote startup delay
@@ -467,8 +492,12 @@ public class Simulation extends Observable implements Runnable {
 
       // Random seed
       if (element.getName().equals("randomseed")) {
-        randomSeed = Long.parseLong(element.getText());
-        delayMotesRandom.setSeed(randomSeed);
+        if (element.getText().equals("generated")) {
+          randomSeedGenerated = true;
+          setRandomSeed(new Random().nextLong());
+        } else {
+          setRandomSeed(Long.parseLong(element.getText()));
+        }
       }
 
       // Max mote startup delay
@@ -602,7 +631,9 @@ public class Simulation extends Observable implements Runnable {
     }
 
     if (maxMoteStartupDelay > 0 && mote.getInterfaces().getClock() != null) {
-      mote.getInterfaces().getClock().setDrift(-delayMotesRandom.nextInt(maxMoteStartupDelay));
+      mote.getInterfaces().getClock().setDrift(
+          -randomGenerator.nextInt(maxMoteStartupDelay)
+      );
     }
 
     currentRadioMedium.registerMote(mote, this);

tools/cooja/java/se/sics/cooja/dialogs/CreateSimDialog.java

@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: CreateSimDialog.java,v 1.14 2008/12/04 14:03:42 joxe Exp $
+ * $Id: CreateSimDialog.java,v 1.15 2009/02/18 10:10:47 fros4943 Exp $
  */
 
 package se.sics.cooja.dialogs;
@@ -34,8 +34,10 @@ package se.sics.cooja.dialogs;
 import java.awt.*;
 import java.awt.event.*;
 import java.text.*;
+import java.util.Random;
 import java.util.Vector;
 import javax.swing.*;
+
 import org.apache.log4j.Logger;
 
 import se.sics.cooja.*;
@@ -61,6 +63,7 @@ public class CreateSimDialog extends JDialog {
 
   private JFormattedTextField delayTime, simulationTime, tickTime;
   private JFormattedTextField randomSeed, tickLists, delayedStartup;
+  private JCheckBox randomSeedGenerated;
 
   private JTextField title;
   private JComboBox radioMediumBox;
@@ -146,7 +149,14 @@ public class CreateSimDialog extends JDialog {
     }
 
     // Set random seed
+    if (simulationToConfigure.getRandomSeedGenerated()) {
+      myDialog.randomSeedGenerated.setSelected(true);
+      myDialog.randomSeed.setEnabled(false);
+      myDialog.randomSeed.setText("[autogenerated]");
+    } else {
+      myDialog.randomSeed.setEnabled(true);
       myDialog.randomSeed.setValue(new Long(simulationToConfigure.getRandomSeed()));
+    }
 
     // Set delayed mote startup time
     myDialog.delayedStartup.setValue(new Integer(simulationToConfigure.getDelayedMoteStartupTime()));
@@ -375,10 +385,25 @@ public class CreateSimDialog extends JDialog {
     numberField.setColumns(4);
     randomSeed = numberField;
 
+    randomSeedGenerated = new JCheckBox();
+    randomSeedGenerated.setToolTipText("Autmatically generate random seed at simulation load");
+    randomSeedGenerated.addActionListener(new ActionListener() {
+      public void actionPerformed(ActionEvent e) {
+        if (((JCheckBox)e.getSource()).isSelected()) {
+          randomSeed.setEnabled(false);
+          randomSeed.setText("[autogenerated]");
+        } else {
+          randomSeed.setEnabled(true);
+          randomSeed.setValue(new Integer(123456));
+        }
+      }
+
+    });
     horizBox.add(label);
     horizBox.add(Box.createHorizontalStrut(150));
     horizBox.add(numberField);
-    horizBox.setToolTipText("Main random seed. Determines mote tick order, mote startup delay etc.");
+    horizBox.add(randomSeedGenerated);
+    horizBox.setToolTipText("Simulation random seed. Controls the random behavior such as mote startup delays, node positions etc.");
 
     advancedBox.add(horizBox);
     advancedBox.add(Box.createVerticalStrut(5));
@@ -422,7 +447,14 @@ public class CreateSimDialog extends JDialog {
           }
         }
 
+        if (randomSeedGenerated.isSelected()) {
+          mySimulation.setRandomSeedGenerated(true);
+          mySimulation.setRandomSeed(new Random().nextLong());
+        } else {
+          mySimulation.setRandomSeedGenerated(false);
           mySimulation.setRandomSeed(((Number) randomSeed.getValue()).longValue());
+        }
+
         mySimulation.setDelayedMoteStartupTime(((Number) delayedStartup.getValue()).intValue());
 
         dispose();