automatically adopt size of word cache to available memory

source/net/yacy/cora/sorting/OrderedScoreMap.java

@@ -31,14 +31,14 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Random;
 import java.util.Set;
 import java.util.SortedMap;
 import java.util.TreeMap;
 import java.util.TreeSet;
 import java.util.concurrent.atomic.AtomicInteger;
 
-
-
+import net.yacy.document.StringBuilderComparator;
 
 public class OrderedScoreMap<E> extends AbstractScoreMap<E> implements ScoreMap<E> {
 
@@ -252,4 +252,16 @@ public class OrderedScoreMap<E> extends AbstractScoreMap<E> implements ScoreMap<
         }
     }
 
+    public static void main(String[] args) {
+    	OrderedScoreMap<StringBuilder> w = new OrderedScoreMap<StringBuilder>(StringBuilderComparator.CASE_INSENSITIVE_ORDER);
+    	Random r = new Random();
+    	for (int i = 0; i < 10000; i++) {
+    		w.inc(new StringBuilder("a" + ((char) (((int) 'a') + r.nextInt(26)))));
+    	}
+    	for (StringBuilder s: w) System.out.println(s + ":" + w.get(s));
+    	System.out.println("--");
+    	w.shrinkToMaxSize(10);
+    	for (StringBuilder s: w) System.out.println(s + ":" + w.get(s));
+    }
+    
 }

source/net/yacy/document/WordCache.java

@@ -48,9 +48,12 @@ import net.yacy.kelondro.util.MemoryControl;
 public class WordCache {
 
     // common word cache
-    private static final int commonWordsMaxSize = 100000; // maximum size of common word cache
+    private static final int commonWordsMaxSize = (int) (MemoryControl.available() / 30000); // maximum size of common word cache
     private static final int commonWordsMinLength = 5;    // words must have that length at minimum
     private static OrderedScoreMap<StringBuilder> commonWords = new OrderedScoreMap<StringBuilder>(StringBuilderComparator.CASE_INSENSITIVE_ORDER);
+    static {
+    	Log.logConfig("WordCache", "commonWordsMaxSize = " + commonWordsMaxSize);
+    }
     
     // dictionaries
     private final File dictionaryPath;
@@ -62,6 +65,7 @@ public class WordCache {
         private final TreeSet<StringBuilder> tcid; // the dictionary of reverse words
 
         public Dictionary(final File file) throws IOException {
+        	
             this.dict = new TreeSet<StringBuilder>(StringBuilderComparator.CASE_INSENSITIVE_ORDER);
             this.tcid = new TreeSet<StringBuilder>(StringBuilderComparator.CASE_INSENSITIVE_ORDER);