small memory leak patch

source/net/yacy/crawler/data/Latency.java

@@ -43,6 +43,7 @@ public class Latency {
     private final static int DEFAULT_AVERAGE = 300;
 
     // the map is a mapping from host names to host configurations
+    private static final int mapMaxSize = 1000;
     private static final ConcurrentHashMap<String, Host> map = new ConcurrentHashMap<String, Host>();
 
     /**
@@ -57,7 +58,7 @@ public class Latency {
         Host h = map.get(hosthash);
         if (h == null) {
             h = new Host(host, DEFAULT_AVERAGE, robotsCrawlDelay);
-            if (map.size() > 1000 || MemoryControl.shortStatus()) map.clear();
+            if (map.size() > mapMaxSize || MemoryControl.shortStatus()) map.clear();
             map.put(hosthash, h);
         }
     }
@@ -74,7 +75,7 @@ public class Latency {
         Host h = map.get(hosthash);
         if (h == null) {
             h = new Host(host, 500, 0);
-            if (map.size() > 1000 || MemoryControl.shortStatus()) map.clear();
+            if (map.size() > mapMaxSize || MemoryControl.shortStatus()) map.clear();
             map.put(hosthash, h);
         } else {
             h.update();
@@ -93,7 +94,7 @@ public class Latency {
         Host h = map.get(hosthash);
         if (h == null) {
             h = new Host(host, time, 0);
-            if (map.size() > 1000 || MemoryControl.shortStatus()) map.clear();
+            if (map.size() > mapMaxSize || MemoryControl.shortStatus()) map.clear();
             map.put(hosthash, h);
         } else {
             h.update(time);

source/net/yacy/repository/LoaderDispatcher.java

@@ -65,6 +65,7 @@ import net.yacy.search.Switchboard;
 
 public final class LoaderDispatcher {
 
+    private final static int accessTimeMaxsize = 1000;
     private static final ConcurrentHashMap<String, Long> accessTime = new ConcurrentHashMap<String, Long>(); // to protect targets from DDoS
 
     private final Switchboard sb;
@@ -271,7 +272,10 @@ public final class LoaderDispatcher {
         }
 
         // now it's for sure that we will access the target. Remember the access time
-        if (host != null) accessTime.put(host, System.currentTimeMillis());
+        if (host != null) {
+            if (accessTime.size() > accessTimeMaxsize) accessTime.clear(); // prevent a memory leak here
+            accessTime.put(host, System.currentTimeMillis());
+        }
 
         // load resource from the internet
         Response response = null;