/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.undertow.session;
import java.util.Map;
import java.util.WeakHashMap;
/**
* Tracks sessions invalidated by the current thread so that JBossCacheManager can avoid trying to retrieve them from the
* distributed cache if the thread asks it to {@link DistributableSessionManager#findSession(String) find} them again.
* <p>
* Needed for cases where code that executes after {@link ClusteredSessionHandler} has returned asks the request for the session
* again. With an invalidated session this results in a <code>findSession</code> call to JBossCacheManager, which results in a
* read of the distributed cache. With buddy replication, that will lead to a data gravitation attempt, which is at a minimum
* expensive and with asynchronous replication may result pulling a stale version of the session back into the cache.
* </p>
*
* @author Brian Stansberry
*/
public class SessionInvalidationTracker {
private static final ThreadLocal<Map<SessionManager, String>> invalidatedSessions = new ThreadLocal<>();
private static final ThreadLocal<Boolean> suspended = new ThreadLocal<>();
public static void suspend() {
suspended.set(Boolean.TRUE);
}
public static void resume() {
suspended.set(null);
}
public static void sessionInvalidated(String id, SessionManager manager) {
if (Boolean.TRUE != suspended.get()) {
Map<SessionManager, String> map = invalidatedSessions.get();
if (map == null) {
map = new WeakHashMap<>(2);
invalidatedSessions.set(map);
}
map.put(manager, id);
}
}
public static void clearInvalidatedSession( SessionManager manager) {
Map<SessionManager, String> map = invalidatedSessions.get();
if (map != null) {
map.remove(manager);
}
}
public static boolean isSessionInvalidated(String id, SessionManager manager) {
boolean result = false;
Map<SessionManager, String> map = invalidatedSessions.get();
if (map != null) {
result = id.equals(map.get(manager));
}
return result;
}
}