clear some more caches if running out of memory

source/net/yacy/cora/protocol/Domains.java

@@ -824,7 +824,11 @@ public class Domains {
     }
 
     public static void clear() {
-        try {globalHosts.clear();} catch (IOException e) {}
+        try {
+        	globalHosts.clear();
+        	NAME_CACHE_HIT.clear();
+        	NAME_CACHE_MISS.clear();
+        } catch (IOException e) {}
     }
     
 

source/net/yacy/repository/Blacklist.java

@@ -307,6 +307,13 @@ public class Blacklist {
         return size;
     }
 
+    public void clearblacklistCache() {
+        final Iterator<BlacklistType> iter = this.cachedUrlHashs.keySet().iterator();
+        while (iter.hasNext()) {
+            this.cachedUrlHashs.get(iter.next()).clear();
+        }
+    }
+
     public boolean hashInBlacklistedCache(final BlacklistType blacklistType, final byte[] urlHash) {
         HandleSet s = getCacheUrlHashsSet(blacklistType);
         return s != null && s.has(urlHash);

source/net/yacy/search/ResourceObserver.java

@@ -26,8 +26,11 @@ package net.yacy.search;
 
 import java.io.File;
 
+import net.yacy.cora.document.WordCache;
+import net.yacy.cora.protocol.Domains;
 import net.yacy.kelondro.logging.Log;
 import net.yacy.kelondro.util.MemoryControl;
+import net.yacy.search.query.SearchEventCache;
 
 public class ResourceObserver {
 
@@ -85,7 +88,13 @@ public class ResourceObserver {
     			this.sb.setConfig(SwitchboardConstants.INDEX_RECEIVE_AUTODISABLED, true);
     		}
     		if (this.normalizedMemoryFree.compareTo(Space.HIGH) < 0 ) {
+    			// clear some caches - @all: are there more of these, we could clear here?
     			this.sb.index.fulltext().clearCache();
+                SearchEventCache.cleanupEvents(true);
+                this.sb.trail.clear();
+                Switchboard.urlBlacklist.clearblacklistCache();
+                WordCache.clear();
+                Domains.clear();
     		}
     	}