/* * Copyright (c) 1997, 2005, 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.net.ssl; import java.util.Enumeration;  /** * A <code>SSLSessionContext</code> represents a set of * <code>SSLSession</code>s associated with a single entity. For example, * it could be associated with a server or client who participates in many * sessions concurrently. * <p> * Not all environments will contain session contexts. * <p> * There are <code>SSLSessionContext</code> parameters that affect how * sessions are stored: * <UL> *      <LI>Sessions can be set to expire after a specified *      time limit. *      <LI>The number of sessions that can be stored in context *      can be limited. * </UL> * A session can be retrieved based on its session id, and all session id's * in a <code>SSLSessionContext</code> can be listed. * * @see SSLSession * * @since 1.4 * @author Nathan Abramson * @author David Brownell */public interface SSLSessionContext {     /**     * Returns the <code>SSLSession</code> bound to the specified session id.     *     * @param sessionId the Session identifier     * @return the <code>SSLSession</code> or null if     * the specified session id does not refer to a valid SSLSession.     *     * @throws NullPointerException if <code>sessionId</code> is null.     */    public SSLSession getSession(byte[] sessionId);     /**     * Returns an Enumeration of all session id's grouped under this     * <code>SSLSessionContext</code>.     *     * @return an enumeration of all the Session id's     */    public Enumeration<byte[]> getIds();     /**     * Sets the timeout limit for <code>SSLSession</code> objects grouped     * under this <code>SSLSessionContext</code>.     * <p>     * If the timeout limit is set to 't' seconds, a session exceeds the     * timeout limit 't' seconds after its creation time.     * When the timeout limit is exceeded for a session, the     * <code>SSLSession</code> object is invalidated and future connections     * cannot resume or rejoin the session.     * A check for sessions exceeding the timeout is made immediately whenever     * the timeout limit is changed for this <code>SSLSessionContext</code>.     *     * @param seconds the new session timeout limit in seconds; zero means     *          there is no limit.     *     * @exception IllegalArgumentException if the timeout specified is < 0.     * @see #getSessionTimeout     */    public void setSessionTimeout(int seconds)                 throws IllegalArgumentException;     /**     * Returns the timeout limit of <code>SSLSession</code> objects grouped     * under this <code>SSLSessionContext</code>.     * <p>     * If the timeout limit is set to 't' seconds, a session exceeds the     * timeout limit 't' seconds after its creation time.     * When the timeout limit is exceeded for a session, the     * <code>SSLSession</code> object is invalidated and future connections     * cannot resume or rejoin the session.     * A check for sessions exceeding the timeout limit is made immediately     * whenever the timeout limit is changed for this     * <code>SSLSessionContext</code>.     *     * @return the session timeout limit in seconds; zero means there is no     * limit.     * @see #setSessionTimeout     */    public int getSessionTimeout();     /**     * Sets the size of the cache used for storing     * <code>SSLSession</code> objects grouped under this     * <code>SSLSessionContext</code>.     *     * @param size the new session cache size limit; zero means there is no     * limit.     * @exception IllegalArgumentException if the specified size is < 0.     * @see #getSessionCacheSize     */    public void setSessionCacheSize(int size)                 throws IllegalArgumentException;     /**     * Returns the size of the cache used for storing     * <code>SSLSession</code> objects grouped under this     * <code>SSLSessionContext</code>.     *     * @return size of the session cache; zero means there is no size limit.     * @see #setSessionCacheSize     */    public int getSessionCacheSize(); }