/*
* JBoss, Home of Professional Open Source.
* Copyright 2013, Red Hat, Inc., 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.wildfly.clustering.web.infinispan.session;
import java.security.AccessController;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import org.jboss.as.clustering.infinispan.distribution.Locality;
import org.jboss.threads.JBossThreadFactory;
import org.wildfly.clustering.ee.Batch;
import org.wildfly.clustering.ee.Batcher;
import org.wildfly.clustering.ee.infinispan.Remover;
import org.wildfly.clustering.ee.infinispan.TransactionBatch;
import org.wildfly.clustering.web.infinispan.logging.InfinispanWebLogger;
import org.wildfly.clustering.web.session.ImmutableSession;
import org.wildfly.security.manager.action.GetAccessControlContextAction;
/**
* Session expiration scheduler that eagerly expires sessions as soon as they are eligible.
* If/When Infinispan implements expiration notifications (ISPN-694), this will be obsolete.
* @author Paul Ferraro
*/
public class SessionExpirationScheduler implements Scheduler {
final Map<String, Future<?>> expirationFutures = new ConcurrentHashMap<>();
final Batcher<TransactionBatch> batcher;
final Remover<String> remover;
private final ScheduledExecutorService executor;
public SessionExpirationScheduler(Batcher<TransactionBatch> batcher, Remover<String> remover) {
this(batcher, remover, createScheduledExecutor(createThreadFactory()));
}
private static ThreadFactory createThreadFactory() {
return new JBossThreadFactory(new ThreadGroup(SessionExpirationScheduler.class.getSimpleName()), Boolean.FALSE, null, "%G - %t", null, null, AccessController.doPrivileged(GetAccessControlContextAction.getInstance()));
}
private static ScheduledExecutorService createScheduledExecutor(ThreadFactory factory) {
ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1, factory);
executor.setRemoveOnCancelPolicy(true);
executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
return executor;
}
public SessionExpirationScheduler(Batcher<TransactionBatch> batcher, Remover<String> remover, ScheduledExecutorService executor) {
this.batcher = batcher;
this.remover = remover;
this.executor = executor;
}
@Override
public void cancel(String sessionId) {
Future<?> future = this.expirationFutures.remove(sessionId);
if (future != null) {
future.cancel(false);
}
}
@Override
public void schedule(ImmutableSession session) {
long timeout = session.getMetaData().getMaxInactiveInterval(TimeUnit.MILLISECONDS);
if (timeout > 0) {
long lastAccessed = session.getMetaData().getLastAccessedTime().getTime();
long delay = Math.max(lastAccessed + timeout - System.currentTimeMillis(), 0);
String id = session.getId();
Runnable task = new ExpirationTask(id);
InfinispanWebLogger.ROOT_LOGGER.tracef("Session %s will expire in %d ms", id, timeout);
synchronized (task) {
this.expirationFutures.put(id, this.executor.schedule(task, delay, TimeUnit.MILLISECONDS));
}
}
}
@Override
public void cancel(Locality locality) {
for (String sessionId: this.expirationFutures.keySet()) {
if (!locality.isLocal(sessionId)) {
this.cancel(sessionId);
}
}
}
@Override
public void close() {
this.executor.shutdown();
for (Future<?> future: this.expirationFutures.values()) {
future.cancel(false);
}
for (Future<?> future: this.expirationFutures.values()) {
if (!future.isDone()) {
try {
future.get();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (ExecutionException e) {
// Ignore
}
}
}
this.expirationFutures.clear();
}
private class ExpirationTask implements Runnable {
private final String id;
public ExpirationTask(String id) {
this.id = id;
}
@Override
public void run() {
InfinispanWebLogger.ROOT_LOGGER.tracef("Expiring session %s", this.id);
try {
Batch batch = SessionExpirationScheduler.this.batcher.createBatch();
boolean success = false;
try {
SessionExpirationScheduler.this.remover.remove(this.id);
success = true;
} catch (Throwable e) {
InfinispanWebLogger.ROOT_LOGGER.failedToExpireSession(e, this.id);
} finally {
if (success) {
batch.close();
} else {
batch.discard();
}
}
} finally {
synchronized (this) {
SessionExpirationScheduler.this.expirationFutures.remove(this.id);
}
}
}
}
}