fix for DHT selection target

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3722 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/yacy/yacyDHTAction.java

@@ -45,8 +45,8 @@ package de.anomic.yacy;
 
 import java.util.ArrayList;
 import java.util.Enumeration;
-import java.util.Hashtable;
 import java.util.TreeMap;
+import java.util.TreeSet;
 
 import de.anomic.kelondro.kelondroBase64Order;
 import de.anomic.kelondro.kelondroCloneableIterator;
@@ -303,9 +303,9 @@ public class yacyDHTAction implements yacyPeerAction {
         double ownDistance = Math.min(yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, firstKey), yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, lastKey));
         double maxDistance = Math.min(ownDistance, maxDist);
 
-        double avdist, firstdist, lastdist;
+        double firstdist, lastdist;
         Enumeration e = this.getAcceptRemoteIndexSeeds(lastKey);
-        Hashtable peerFilter = new Hashtable();
+        TreeSet doublecheck = new TreeSet(kelondroBase64Order.enhancedCoder);
         int maxloop = Math.min(100, yacyCore.seedDB.sizeConnected()); // to ensure termination
         if (log != null) log.logInfo("Collecting DHT target peers for first_hash = " + firstKey + ", last_hash = " + lastKey);
         while ((e.hasMoreElements()) && (seeds.size() < (primaryPeerCount + reservePeerCount)) && (maxloop-- > 0)) {
@@ -313,11 +313,10 @@ public class yacyDHTAction implements yacyPeerAction {
             if (seeds != null) {
             	firstdist = yacyDHTAction.dhtDistance(seed.hash, firstKey);
             	lastdist = yacyDHTAction.dhtDistance(seed.hash, lastKey);
-                avdist = Math.max(firstdist, lastdist);
-                if (avdist < maxDistance && !peerFilter.containsKey(seed.hash)) {
+                if ((lastdist < maxDistance) && (!(doublecheck.contains(seed.hash)))) {
                     if (log != null) log.logInfo("Selected  " + ((seeds.size() < primaryPeerCount) ? "primary" : "reserve") + "  DHT target peer " + seed.getName() + ":" + seed.hash + ", distance2first = " + firstdist + ", distance2last = " + lastdist);
                     seeds.add(seed);
-                    peerFilter.put(seed.hash, seed);
+                    doublecheck.add(seed.hash);
                 } else {
                 	if (log != null) log.logInfo("Discarded improper DHT target peer " + seed.getName() + ":" + seed.hash + ", distance2first = " + firstdist + ", distance2last = " + lastdist);
                 }