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HazelcastSessionManager.java
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HazelcastSessionManager.java
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package org.appng.tomcat.session.hazelcast;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.juli.logging.Log;
import org.appng.tomcat.session.Session;
import org.appng.tomcat.session.SessionData;
import org.appng.tomcat.session.SessionManager;
import org.appng.tomcat.session.Utils;
import com.hazelcast.cluster.Address;
import com.hazelcast.config.ClasspathXmlConfig;
import com.hazelcast.core.EntryEvent;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.map.IMap;
import com.hazelcast.map.listener.EntryRemovedListener;
import com.hazelcast.topic.ITopic;
import com.hazelcast.topic.Message;
import com.hazelcast.topic.MessageListener;
public class HazelcastSessionManager extends SessionManager<IMap<String, SessionData>> {
private final Log log = Utils.getLog(HazelcastSessionManager.class);
// Listen for sessions that have been remove from the persistent store
private class SessionRemovedListener implements EntryRemovedListener<String, SessionData> {
@Override
public void entryRemoved(EntryEvent<String, SessionData> event) {
// remove locally cached session
String sessionId = event.getOldValue().getId();
org.apache.catalina.Session oldValue = sessions.remove(sessionId);
if (log.isDebugEnabled()) {
Address address = event.getMember().getAddress();
if (null != oldValue) {
log.debug(String.format("%s has been removed from local cache due to removal event from %s",
sessionId, address));
} else {
log.debug(String.format("%s was not present in local cache, received removal event from %s",
sessionId, address));
}
}
}
}
private class SiteReloadListener implements MessageListener<byte[]> {
@Override
public void onMessage(Message<byte[]> message) {
// clears the locally cached sessions when a SiteReloadEvent occurs
byte[] data = message.getMessageObject();
try {
ByteArrayInputStream bais = new ByteArrayInputStream(data);
ObjectInputStream ois = new ObjectInputStream(bais);
String siteName = (String) ois.readObject();
bais.reset();
ObjectInputStream siteOis = Utils.getObjectInputStream(bais, siteName, getContext());
// org.appng.api.messaging.Serializer first writes the siteName, then the event itself
siteName = (String) siteOis.readObject();
Object event = siteOis.readObject();
String eventType = event.getClass().getName();
if (clearSessionsOnEvent.contains(eventType)) {
log.info(String.format("Received %s, clearing %s local sessions!", eventType, sessions.size()));
sessions.clear();
}
} catch (Throwable t) {
log.error("Error reading event", t);
}
}
}
private String configFile = "hazelcast.xml";
private String mapName = "tomcat.sessions";
private String topicName = "appng-messaging";
protected List<String> clearSessionsOnEvent = Arrays.asList("org.appng.core.controller.messaging.ReloadSiteEvent",
"org.appng.appngizer.controller.SiteController.ReloadSiteFromAppNGizer");
private HazelcastInstance instance;
@Override
public Log log() {
return log;
}
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
protected void startInternal() throws LifecycleException {
super.startInternal();
ClasspathXmlConfig config = new ClasspathXmlConfig(configFile);
instance = Hazelcast.getOrCreateHazelcastInstance(config);
UUID listenerUid = getTopic().addMessageListener((MessageListener) new SiteReloadListener());
log.info(String.format("Attached to topic %s with UUID %s", topicName, listenerUid));
log.info(String.format("Loaded %s from %s", instance, configFile));
log.info(String.format("Sticky: %s", sticky));
setState(LifecycleState.STARTING);
getPersistentSessions().addEntryListener(new SessionRemovedListener(), true);
}
protected ITopic<Object> getTopic() {
return instance.getReliableTopic(topicName);
}
@Override
public void processExpires() {
long timeNow = System.currentTimeMillis();
Set<String> keys = new HashSet<>();
if (sticky) {
keys.addAll(sessions.keySet());
} else {
keys.addAll(getPersistentSessions().keySet());
}
if (log.isDebugEnabled()) {
log.debug(String.format("Performing expiration check for %s sessions.", keys.size()));
}
AtomicInteger count = new AtomicInteger(0);
keys.forEach(k -> {
try {
SessionData sessionData = getPersistentSessions().get(k);
if (null == sessionData) {
if (log.isDebugEnabled()) {
log.debug(String.format("Session %s not found in persistent store.", k));
}
if (sticky) {
removeLocal(sessions.get(k));
}
} else {
Session session = Session.load(this, sessionData);
if (null == session) {
// session is not valid, so manager.remove(session, true) already has been called
// which in turn will remove the session from the local cache and also from the persistent store
count.incrementAndGet();
if (log.isTraceEnabled()) {
log.trace(String.format("%s has been removed by internal expiration", k, mapName));
}
}
}
} catch (Throwable t) {
log.error("Error expiring session " + k, t);
}
});
long timeEnd = System.currentTimeMillis();
long duration = timeEnd - timeNow;
processingTime += duration;
if (log.isInfoEnabled()) {
log.info(String.format("Expired %s of %s sessions in %sms", count, keys.size(), duration));
}
}
@Override
protected void updateSession(String id, SessionData sessionData) {
getPersistentSessions().set(id, sessionData);
}
@Override
protected String generateSessionId() {
String result = null;
do {
if (result != null) {
// Not thread-safe but if one of multiple increments is lost
// that is not a big deal since the fact that there was any
// duplicate is a much bigger issue.
duplicates++;
}
result = sessionIdGenerator.generateSessionId();
} while (sessions.containsKey(result) || getPersistentSessions().containsKey(result));
log.debug(String.format("Generated session ID: %s", result));
return result;
}
@Override
protected SessionData findSessionInternal(String id) throws IOException {
SessionData sessionData = null;
getPersistentSessions().lock(id);
try {
sessionData = getPersistentSessions().get(id);
} finally {
getPersistentSessions().unlock(id);
}
return sessionData;
}
@Override
public void removeInternal(org.apache.catalina.Session session) {
getPersistentSessions().remove(session.getId());
if (log.isTraceEnabled()) {
log.trace(String.format("%s has been removed from '%s'", session.getId(), mapName));
}
}
protected IMap<String, SessionData> getPersistentSessions() {
return instance.getMap(mapName);
}
public void setConfigFile(String configFile) {
this.configFile = configFile;
}
public void setMapName(String mapName) {
this.mapName = mapName;
}
public void setTopicName(String topicName) {
this.topicName = topicName;
}
}