Statistician

- Returns some times in milliseconds instead of microseconds

KadServer
- Made a few operations synchronized
- Handled the exception when the timer is already canceled

src/kademlia/Statistician.java

@@ -111,11 +111,11 @@ public class Statistician
     /**
      * Compute the average time a content lookup took
      *
-     * @return The average time
+     * @return The average time in milliseconds
      */
     public double averageContentLookupTime()
     {
-        double avg = (double) this.totalContentLookupTime / (double) this.numContentLookups;
+        double avg = (double) ((double) this.totalContentLookupTime / (double) this.numContentLookups) / 1000000D;
         DecimalFormat df = new DecimalFormat("#.00");
         return new Double(df.format(avg));
     }

src/kademlia/core/DefaultConfiguration.java

@@ -14,7 +14,7 @@ public class DefaultConfiguration implements KadConfiguration
     private final static long RESPONSE_TIMEOUT = 1500;
     private final static long OPERATION_TIMEOUT = 3000;
     private final static int CONCURRENCY = 10;
-    private final static int K = 10;
+    private final static int K = 5;
     private final static int RCSIZE = 3;
     private final static int STALE = 1;
     private final static String LOCAL_FOLDER = "kademlia";

src/kademlia/core/KadServer.java

@@ -111,7 +111,7 @@ public class KadServer
     {
         if (!isRunning)
         {
-            throw new KadServerDownException("Kad Server is not running on node " + this.localNode);
+            throw new KadServerDownException(this.localNode + " - Kad Server is not running.");
         }
 
         /* Generate a random communication ID */
@@ -119,6 +119,8 @@ public class KadServer
 
         /* If we have a receiver */
         if (recv != null)
+        {
+            try
             {
                 /* Setup the receiver to handle message response */
                 receivers.put(comm, recv);
@@ -126,6 +128,11 @@ public class KadServer
                 timer.schedule(task, this.config.responseTimeout());
                 tasks.put(comm, task);
             }
+            catch (IllegalStateException ex)
+            {
+                /* The timer is already cancelled so we cannot do anything here really */
+            }
+        }
 
         /* Send the message */
         sendMessage(to, msg, comm);
@@ -154,7 +161,7 @@ public class KadServer
     /**
      * Internal sendMessage method called by the public sendMessage method after a communicationId is generated
      */
-    private void sendMessage(Node to, Message msg, int comm) throws IOException
+    private synchronized void sendMessage(Node to, Message msg, int comm) throws IOException
     {
         /* Use a try-with resource to auto-close streams after usage */
         try (ByteArrayOutputStream bout = new ByteArrayOutputStream(); DataOutputStream dout = new DataOutputStream(bout);)
@@ -185,7 +192,7 @@ public class KadServer
     /**
      * Listen for incoming messages in a separate thread
      */
-    private void listen()
+    private synchronized void listen()
     {
         try
         {
@@ -272,7 +279,7 @@ public class KadServer
     /**
      * Stops listening and shuts down the server
      */
-    public void shutdown()
+    public synchronized void shutdown()
     {
         this.isRunning = false;
         this.socket.close();