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diff --git a/tools/gnu/classpath/tools/common/Persistent.java b/tools/gnu/classpath/tools/common/Persistent.java
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+/* PersistentBidiHasthable.java -- Constants for the persistent tables.
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.classpath.tools.common;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * The static fields, shared by the multiple classes, implementing the
+ * persistent work.
+ * 
+ * @author Audrius Meskauskas (audriusa@bioinformatics.org)
+ */
+public interface Persistent
+{
+  /**
+   * Sheduled termination task.
+   */
+  static class ExitTask extends TimerTask
+  {
+    public void run()
+    {
+      System.exit(0);
+    }
+  }
+  
+  /**
+   * The timer, sheduling all disk database update events, shared by all
+   * instances.
+   */
+  static Timer timer = new Timer(true);
+
+  /**
+   * The longest time, in ms, after that the database content on the disk must
+   * be updated. The algorithm is written to avoid the very frequent writings to
+   * the disk.
+   */
+  static long SAVE_AT_MOST_AFTER = 5000;
+
+  /**
+   * States how long the database may stay not updated during the intensive
+   * operations, in ms. Otherwise the intensively used structure may never
+   * be stored to the disk.
+   */
+  static long ALWAYS_UPDATE = 300000;
+  
+  /**
+   * Write the database content to the disk.
+   */
+  void writeContent();  
+  
+}