Make parameters of NegativeLookupCache configurable

router/java/src/net/i2p/router/networkdb/kademlia/KademliaNetworkDatabaseFacade.java

@@ -274,7 +274,7 @@ public class KademliaNetworkDatabaseFacade extends NetworkDatabaseFacade {
         //_ds = new TransientDataStore();
 //        _exploreKeys = new HashSet(64);
         _dbDir = dbDir;
-        _negativeCache = new NegativeLookupCache();
+        _negativeCache = new NegativeLookupCache(_context);
         
         createHandlers();
         

router/java/src/net/i2p/router/networkdb/kademlia/NegativeLookupCache.java

@@ -4,6 +4,7 @@ import java.util.Map;
 
 import net.i2p.data.Destination;
 import net.i2p.data.Hash;
+import net.i2p.router.RouterContext;
 import net.i2p.util.LHMCache;
 import net.i2p.util.ObjectCounter;
 import net.i2p.util.SimpleTimer;
@@ -17,15 +18,18 @@ import net.i2p.util.SimpleTimer2;
 class NegativeLookupCache {
     private final ObjectCounter<Hash> counter;
     private final Map<Hash, Destination> badDests;
-
+    private final int _maxFails;
+    
     private static final int MAX_FAILS = 3;
     private static final int MAX_BAD_DESTS = 128;
     private static final long CLEAN_TIME = 2*60*1000;
 
-    public NegativeLookupCache() {
+    public NegativeLookupCache(RouterContext context) {
         this.counter = new ObjectCounter<Hash>();
         this.badDests = new LHMCache<Hash, Destination>(MAX_BAD_DESTS);
-        SimpleTimer2.getInstance().addPeriodicEvent(new Cleaner(), CLEAN_TIME);
+        this._maxFails = context.getProperty("netdb.negativeCache.maxFails",MAX_FAILS);
+        final long cleanTime = context.getProperty("netdb.negativeCache.cleanupInterval", CLEAN_TIME);
+        SimpleTimer2.getInstance().addPeriodicEvent(new Cleaner(), cleanTime);
     }
 
     public void lookupFailed(Hash h) {
@@ -33,7 +37,7 @@ class NegativeLookupCache {
     }
 
     public boolean isCached(Hash h) {
-        if (counter.count(h) >= MAX_FAILS)
+        if (counter.count(h) >= _maxFails)
             return true;
         synchronized(badDests) {
             return badDests.get(h) != null;