a variety of possible memory leak fixes

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

@@ -453,6 +453,7 @@ public class Domains {
             globalHosts = null;
         } else try {
             globalHosts = new KeyList(globalHostsnameCache);
+            Log.logInfo("Domains", "loaded globalHosts cache of hostnames, size = " + globalHosts.size());
         } catch (final IOException e) {
             globalHosts = null;
         }

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

@@ -89,7 +89,7 @@ public class WeakPriorityBlockingQueue<E> {
 
 
     /**
-     * get the number of elements that had been drained so far and are wainting
+     * get the number of elements that had been drained so far and are waiting
      * in a list to get enumerated with element()
      * @return
      */
@@ -103,7 +103,7 @@ public class WeakPriorityBlockingQueue<E> {
      * @return
      */
     public synchronized int sizeAvailable() {
-        return this.queue.size() + this.drained.size();
+        return Math.min(this.maxsize, this.queue.size() + this.drained.size());
     }
 
     /**
@@ -170,7 +170,7 @@ public class WeakPriorityBlockingQueue<E> {
         final Element<E> element = this.queue.first();
         assert element != null;
         this.queue.remove(element);
-        this.drained.add(element);
+        if (this.drained.size() < this.maxsize) this.drained.add(element);
         assert this.queue.size() >= this.enqueued.availablePermits() : "(take) queue.size() = " + this.queue.size() + ", enqueued.availablePermits() = " + this.enqueued.availablePermits();
         return element;
     }
@@ -289,14 +289,17 @@ public class WeakPriorityBlockingQueue<E> {
         public long weight;
         public E element;
 
+        @Override
         public long getWeight() {
             return this.weight;
         }
 
+        @Override
         public E getElement() {
             return this.element;
         }
 
+        @Override
         public boolean equals(Element<E> o) {
             return this.element.equals(o.getElement());
         }
@@ -308,7 +311,7 @@ public class WeakPriorityBlockingQueue<E> {
 
         @Override
         public String toString() {
-            return element.toString() + "/" + weight;
+            return this.element.toString() + "/" + this.weight;
         }
     }
 
@@ -323,10 +326,12 @@ public class WeakPriorityBlockingQueue<E> {
             this.weight = weight;
         }
 
+        @Override
         public int compare(NaturalElement<E> o1, NaturalElement<E> o2) {
             return o1.compareTo(o2);
         }
 
+        @Override
         public int compareTo(NaturalElement<E> o) {
             if (this.element == o.getElement()) return 0;
             if (this.element.equals(o.getElement())) return 0;
@@ -352,10 +357,12 @@ public class WeakPriorityBlockingQueue<E> {
             this.weight = weight;
         }
 
+        @Override
         public int compare(ReverseElement<E> o1, ReverseElement<E> o2) {
             return o1.compareTo(o2);
         }
 
+        @Override
         public int compareTo(ReverseElement<E> o) {
             if (this.element == o.getElement()) return 0;
             if (this.element.equals(o.getElement())) return 0;

source/net/yacy/cora/storage/HashARC.java

@@ -37,13 +37,13 @@ public final class HashARC<K, V> extends SimpleARC<K, V> implements Map<K, V>, I
 
     public HashARC(final int cacheSize) {
         this.cacheSize = cacheSize / 2;
-        super.levelA = Collections.synchronizedMap(new LinkedHashMap<K, V>(cacheSize, 0.1f, accessOrder) {
+        super.levelA = Collections.synchronizedMap(new LinkedHashMap<K, V>(1, 0.1f, accessOrder) {
             private static final long serialVersionUID = 1L;
             @Override protected boolean removeEldestEntry(final Map.Entry<K, V> eldest) {
                 return size() > HashARC.this.cacheSize;
             }
         });
-        this.levelB = Collections.synchronizedMap(new LinkedHashMap<K, V>(cacheSize, 0.1f, accessOrder) {
+        this.levelB = Collections.synchronizedMap(new LinkedHashMap<K, V>(1, 0.1f, accessOrder) {
             private static final long serialVersionUID = 1L;
             @Override protected boolean removeEldestEntry(final Map.Entry<K, V> eldest) {
                 return size() > HashARC.this.cacheSize;

source/net/yacy/cora/storage/KeyList.java

@@ -76,6 +76,10 @@ public class KeyList implements Iterable<String> {
 
     }
 
+    public int size() {
+        return this.keys.size();
+    }
+
     public boolean contains(final String key) {
         return this.keys.containsKey(key.trim().toLowerCase());
     }

source/net/yacy/kelondro/index/HandleMap.java

@@ -98,6 +98,7 @@ public final class HandleMap implements Iterable<Row.Entry> {
         is.close();
         is = null;
         assert this.index.size() == file.length() / (keylength + idxbytes);
+        trim();
     }
 
     public void trim() {
@@ -415,6 +416,7 @@ public final class HandleMap implements Iterable<Row.Entry> {
             return this.result.get();
         }
 
+        @Override
         public final HandleMap call() throws IOException {
             try {
                 finishloop: while (true) {
@@ -439,7 +441,8 @@ public final class HandleMap implements Iterable<Row.Entry> {
         }
     }
 
-	public Iterator<Row.Entry> iterator() {
+	@Override
+    public Iterator<Row.Entry> iterator() {
 		return rows(true, null);
 	}
 }

source/net/yacy/kelondro/rwi/ReferenceContainerArray.java

@@ -473,6 +473,7 @@ public final class ReferenceContainerArray<ReferenceType extends Reference> {
                 }
             }
         }
+        references.trim();
         System.out.println("CELL REFERENCE COLLECTION finished");
         return references;
     }

source/net/yacy/kelondro/table/Table.java

@@ -187,6 +187,7 @@ public class Table implements Index, Iterable<Row.Entry> {
                     }
                 }
             }
+            this.index.trim();
 
             // open the file
             this.file = new BufferedRecords(new Records(tablefile, rowdef.objectsize), this.buffersize);
@@ -594,6 +595,7 @@ public class Table implements Index, Iterable<Row.Entry> {
      * @throws IOException
      * @throws RowSpaceExceededException
      */
+    @Override
     public boolean put(final Entry row) throws IOException, RowSpaceExceededException {
         assert row != null;
         if (this.file == null || row == null) return true;
@@ -702,6 +704,7 @@ public class Table implements Index, Iterable<Row.Entry> {
         }
     }
 
+    @Override
     public boolean delete(final byte[] key) throws IOException {
         return remove(key) != null;
     }

source/net/yacy/search/query/SnippetProcess.java

@@ -109,8 +109,8 @@ public class SnippetProcess {
 
         this.urlRetrievalAllTime = 0;
         this.snippetComputationAllTime = 0;
-        this.result = new WeakPriorityBlockingQueue<ResultEntry>(-1); // this is the result, enriched with snippets, ranked and ordered by ranking
+        this.result = new WeakPriorityBlockingQueue<ResultEntry>(Math.max(1000, 10 * query.itemsPerPage())); // this is the result, enriched with snippets, ranked and ordered by ranking
-        this.images = new WeakPriorityBlockingQueue<MediaSnippet>(-1);
+        this.images = new WeakPriorityBlockingQueue<MediaSnippet>(Math.max(1000, 10 * query.itemsPerPage()));
 
         // snippets do not need to match with the complete query hashes,
         // only with the query minus the stopwords which had not been used for the search

source/net/yacy/search/snippet/TextSnippet.java

@@ -206,10 +206,10 @@ public class TextSnippet implements Comparable<TextSnippet>, Comparator<TextSnip
 
                 if (de.anomic.crawler.Cache.has(url.hash())) {
                     // get the sentences from the cache
-                    final Request request = loader.request(url, true, reindexing);
+                    final Request request = loader == null ? null : loader.request(url, true, reindexing);
                     Response response;
                     try {
-                        response = loader == null ? null : loader.load(request, CacheStrategy.CACHEONLY, true);
+                        response = loader == null || request == null ? null : loader.load(request, CacheStrategy.CACHEONLY, true);
                     } catch (IOException e1) {
                         response = null;
                     }