INTEGRATION: CWS uno4 (1.1.2); FILE ADDED

2003/05/09 10:11:46 sb 1.1.2.1: #108642# Helper class WaitUnreachable added.

qadevOOo/runner/util/WaitUnreachable.java

+/*************************************************************************
+ *
+ *  $RCSfile: WaitUnreachable.java,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: vg $ $Date: 2003-05-22 08:36:20 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (the "License"); You may not use this file
+ *  except in compliance with the License. You may obtain a copy of the
+ *  License at http://www.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+package util;
+
+import java.lang.ref.PhantomReference;
+import java.lang.ref.ReferenceQueue;
+
+/**
+ * Wait until an object has become unreachable.
+ *
+ * <p>This class will typically be used as follows:</p>
+ * <pre>
+ * Object o = ...;
+ * ...
+ * WaitUnreachable u = new WaitUnreachable(o);
+ * o = null;
+ * u.waitUnreachable();
+ * </pre>
+ */
+public final class WaitUnreachable {
+    public WaitUnreachable(Object obj) {
+        queue = new ReferenceQueue();
+        ref = new PhantomReference(obj, queue);
+    }
+
+    public void waitUnreachable() {
+        System.out.println("waiting for gc");
+        while (queue.poll() == null) {
+            System.gc();
+            System.runFinalization();
+            byte[] dummy = new byte[1024];
+        }
+    }
+
+    private final ReferenceQueue queue;
+    private final PhantomReference ref;
+}