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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.List;
import java.util.UUID;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.juli.logging.Log;
import org.appng.tomcat.session.SessionData;
import org.appng.tomcat.session.SessionManager;
import org.appng.tomcat.session.Utils;
import com.hazelcast.config.ClasspathXmlConfig;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.map.IMap;
import com.hazelcast.topic.ITopic;
import com.hazelcast.topic.Message;
import com.hazelcast.topic.MessageListener;
public class HazelcastSessionManager extends SessionManager<IMap<String, SessionData>>
implements MessageListener<byte[]> {
private final Log log = Utils.getLog(HazelcastSessionManager.class);
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) this);
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("Always store session: %s", alwaysStoreSession));
setState(LifecycleState.STARTING);
}
protected ITopic<Object> getTopic() {
return instance.getReliableTopic(topicName);
}
@Override
public void onMessage(Message<byte[]> message) {
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);
}
}
@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, boolean update) {
getPersistentSessions().remove(session.getId());
if (log.isTraceEnabled()) {
log.trace(String.format("Removed %s (update: %s)", session.getId(), update));
}
}
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;
}
}