added property app.cacheusage that holds current number of elements

in the object cache.

src/helma/framework/core/ApplicationBean.java

@@ -114,6 +114,10 @@ public class ApplicationBean implements Serializable {
 
     // getter methods for readonly properties of this application
 
+    public int getcacheusage () {
+    return app.nmgr.countCacheEntries ();
+    }
+
     public INode getdata() {
 	return app.getCacheNode ();
     }

src/helma/objectmodel/db/NodeManager.java

@@ -1160,6 +1160,13 @@ public final class NodeManager {
 	return cache.getEntryArray ();
     }
 
+    /**
+     * Get the number of elements in the object cache
+     */
+    public int countCacheEntries () {
+    return cache.size ();
+    }
+
     /**
     * Clear the object cache, causing all objects to be recreated.
     */