/* * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.security.auth; /** * Objects such as credentials may optionally implement this * interface to provide the capability to refresh itself. * For example, a credential with a particular time-restricted lifespan * may implement this interface to allow callers to refresh the time period * for which it is valid. * * @see javax.security.auth.Subject */public interface Refreshable {     /**     * Determine if this <code>Object</code> is current.     *     * <p>     *     * @return true if this <code>Object</code> is currently current,     *          false otherwise.     */    boolean isCurrent();     /**     * Update or extend the validity period for this     * <code>Object</code>.     *     * <p>     *     * @exception SecurityException if the caller does not have permission     *          to update or extend the validity period for this     *          <code>Object</code>. <p>     *     * @exception RefreshFailedException if the refresh attempt failed.     */    void refresh() throws RefreshFailedException;}