*) Adding missing synchronized blocks

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@608 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/plasma/plasmaHTCache.java

@@ -133,19 +133,25 @@ public final class plasmaHTCache {
     }
 
     public int size() {
-        return cacheStack.size();
+        synchronized (this.cacheStack) {
+            return this.cacheStack.size();
+        }        
     }
 
     public void push(Entry entry) {
-        cacheStack.add(entry);
+        synchronized (this.cacheStack) {
+            this.cacheStack.add(entry);
+        }
     }
 
     public Entry pop() {
-        if (cacheStack.size() > 0)
-            return (Entry) cacheStack.removeFirst();
+        synchronized (this.cacheStack) {
+        if (this.cacheStack.size() > 0)
+            return (Entry) this.cacheStack.removeFirst();
         else
             return null;
         }
+    }
 
     public void storeHeader(String urlHash, httpHeader responseHeader) throws IOException {
         responseHeaderDB.set(urlHash, responseHeader);