/*
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* Copyright 2015, 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.undertow.session;
import java.time.Duration;
import java.time.Instant;
import java.util.AbstractMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import org.wildfly.clustering.ee.Recordable;
import org.wildfly.clustering.web.session.ImmutableSession;
import org.wildfly.clustering.web.session.InactiveSessionStatistics;
/**
* Records statistics for inactive sessions.
* @author Paul Ferraro
*/
public class RecordableInactiveSessionStatistics implements InactiveSessionStatistics, Recordable<ImmutableSession> {
private final AtomicLong expiredSessions = new AtomicLong();
private final AtomicReference<Duration> maxLifetime = new AtomicReference<>();
// Tuple containing total lifetime of sessions, and total session count
private final AtomicReference<Map.Entry<Duration, Long>> totals = new AtomicReference<>();
public RecordableInactiveSessionStatistics() {
this.reset();
}
@Override
public void record(ImmutableSession session) {
Duration lifetime = Duration.between(session.getMetaData().getCreationTime(), Instant.now());
Duration currentMaxLifetime = this.maxLifetime.get();
while (lifetime.compareTo(currentMaxLifetime) > 0) {
if (this.maxLifetime.compareAndSet(currentMaxLifetime, lifetime)) {
break;
}
currentMaxLifetime = this.maxLifetime.get();
}
Map.Entry<Duration, Long> currentTotals = this.totals.get();
Map.Entry<Duration, Long> sessions = createNewTotals(currentTotals, lifetime);
while (!this.totals.compareAndSet(currentTotals, sessions)) {
currentTotals = this.totals.get();
sessions = createNewTotals(currentTotals, lifetime);
}
if (session.getMetaData().isExpired()) {
this.expiredSessions.incrementAndGet();
}
}
private static Map.Entry<Duration, Long> createNewTotals(Map.Entry<Duration, Long> totals, Duration lifetime) {
Duration totalLifetime = totals.getKey();
long totalSessions = totals.getValue();
return new AbstractMap.SimpleImmutableEntry<>(totalLifetime.plus(lifetime), totalSessions + 1);
}
@Override
public Duration getMeanSessionLifetime() {
Map.Entry<Duration, Long> totals = this.totals.get();
Duration lifetime = totals.getKey();
long count = totals.getValue();
return (count > 0) ? lifetime.dividedBy(count) : Duration.ZERO;
}
@Override
public Duration getMaxSessionLifetime() {
return this.maxLifetime.get();
}
@Override
public long getExpiredSessionCount() {
return this.expiredSessions.get();
}
@Override
public void reset() {
this.maxLifetime.set(Duration.ZERO);
this.totals.set(new AbstractMap.SimpleImmutableEntry<>(Duration.ZERO, 0L));
this.expiredSessions.set(0L);
}
}