/* Refreshable.java -- an object whose state may be refreshed.
   Copyright (C) 2004 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
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independent module, the terms and conditions of the license of that
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this exception to your version of the library, but you are not
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exception statement from your version. */


package javax.security.auth;

/**
 * An object whose internal state may be <em>refreshed:</em> as in a
 * credential object with a expiry date.
 */
public interface Refreshable
{

  /**
   * Tells whether or not this object is current. Refreshable objects that
   * are not current may need to be refreshed.
   *
   * @return Whether this object is current.
   */
  boolean isCurrent();

  /**
   * Refresh this object. The process involved in refreshing an object is
   * per-implementation dependent.
   *
   * @throws RefreshFailedException If refreshing this object fails.
   * @throws SecurityException If the caller does not have permission to
   *  refresh, or to take the steps involved in refreshing, this object.
   */
  void refresh() throws RefreshFailedException;
}