diff options
Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/sasl/srp/ClientStore.java')
| -rw-r--r-- | libjava/classpath/gnu/javax/crypto/sasl/srp/ClientStore.java | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/sasl/srp/ClientStore.java b/libjava/classpath/gnu/javax/crypto/sasl/srp/ClientStore.java new file mode 100644 index 00000000000..ce16f4aa75d --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/sasl/srp/ClientStore.java @@ -0,0 +1,173 @@ +/* ClientStore.java -- + Copyright (C) 2003, 2006 Free Software Foundation, Inc. + +This file is a 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, 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.javax.crypto.sasl.srp; + +import java.util.HashMap; + +/** + * <p>The client-side implementation of the SRP security context store.</p> + */ +public class ClientStore +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + /** The underlying singleton. */ + private static ClientStore singleton = null; + + /** The map of uid --> SASL Security Context record. */ + private static final HashMap uid2ssc = new HashMap(); + + /** The map of sid --> Session timing record. */ + private static final HashMap uid2ttl = new HashMap(); + + /** A synchronisation lock. */ + private static final Object lock = new Object(); + + // Constructor(s) + // ------------------------------------------------------------------------- + + /** Private constructor to enforce Singleton pattern. */ + private ClientStore() + { + super(); + + // TODO: add a cleaning timer thread + } + + // Class methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns the classloader Singleton.</p> + * + * @return the classloader Singleton instance. + */ + static synchronized final ClientStore instance() + { + if (singleton == null) + { + singleton = new ClientStore(); + } + return singleton; + } + + // Instance methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns a boolean flag indicating if the designated client's session is + * still alive or not.</p> + * + * @param uid the identifier of the client whose session to check. + * @return <code>true</code> if the designated client's session is still + * alive. <code>false</code> otherwise. + */ + boolean isAlive(final String uid) + { + final boolean result; + synchronized (lock) + { + final Object obj = uid2ssc.get(uid); + result = (obj != null); + if (result) + { // is it still alive? + final StoreEntry sto = (StoreEntry) uid2ttl.get(uid); + if (!sto.isAlive()) + { // invalidate it + uid2ssc.remove(uid); + uid2ttl.remove(uid); + } + } + } + return result; + } + + /** + * <p>Records a mapping between a client's unique identifier and its security + * context.</p> + * + * @param uid the unique identifier of the SRP client for which the session + * is to be cached. + * @param ttl the session's Time-To-Live indicator (in seconds). + * @param ctx the client's security context. + */ + void cacheSession(final String uid, final int ttl, final SecurityContext ctx) + { + synchronized (lock) + { + uid2ssc.put(uid, ctx); + uid2ttl.put(uid, new StoreEntry(ttl)); + } + } + + /** + * <p>Removes the mapping between the designated SRP client unique identifier + * and the its session security context (and other timing information).</p> + * + * @param uid the identifier of the client whose session is to invalidate. + */ + void invalidateSession(final String uid) + { + synchronized (lock) + { + uid2ssc.remove(uid); + uid2ttl.remove(uid); + } + } + + /** + * <p>Returns an SRP client's security context record mapped by that client's + * unique identifier.</p> + * + * @param uid the identifier of the client whose session is to restore. + * @return the SRP client's security context. + */ + SecurityContext restoreSession(final String uid) + { + final SecurityContext result; + synchronized (lock) + { + result = (SecurityContext) uid2ssc.remove(uid); + uid2ttl.remove(uid); + } + return result; + } +}
\ No newline at end of file |
