Java tutorial
/* * Copyright (c) 1997, 2018, 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>. * * @apiNote Note that the JDK Implementation uses default values for both * the session cache size and timeout. See * {@code getSessionCacheSize} and {@code getSessionTimeout} for * more information. Applications should consider their * performance requirements and override the defaults if necessary. * * @param seconds the new session timeout limit in seconds; zero means * there is no limit. * * @throws IllegalArgumentException if the timeout specified is {@code < 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>. * * @implNote The JDK implementation returns the session timeout as set by * the {@code setSessionTimeout} method, or if not set, a default * value of 86400 seconds (24 hours). * * @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>. * * @apiNote Note that the JDK Implementation uses default values for both * the session cache size and timeout. See * {@code getSessionCacheSize} and {@code getSessionTimeout} for * more information. Applications should consider their * performance requirements and override the defaults if necessary. * * @param size the new session cache size limit; zero means there is no * limit. * * @throws IllegalArgumentException if the specified size is {@code < 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>. * * @implNote The JDK implementation returns the cache size as set by * the {@code setSessionCacheSize} method, or if not set, the * value of the {@systemProperty javax.net.ssl.sessionCacheSize} * system property. If neither is set, it returns a default * value of 20480. * * @return size of the session cache; zero means there is no size limit. * * @see #setSessionCacheSize */ public int getSessionCacheSize(); }