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package com.pdd.pop.ext.glassfish.grizzly.http.server;
import java.util.Iterator;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import com.pdd.pop.ext.glassfish.grizzly.http.Cookie;
import com.pdd.pop.ext.glassfish.grizzly.utils.DataStructures;
/**
* Default {@link SessionManager} implementation.
*/
public class DefaultSessionManager implements SessionManager {
/**
* @return DefaultSessionManager singleton
*/
public static SessionManager instance() {
return LazyHolder.INSTANCE;
}
// Lazy initialization of DefaultSessionManager
private static class LazyHolder {
private static final DefaultSessionManager INSTANCE = new DefaultSessionManager();
}
/**
* Not Good. We need a better mechanism. TODO: Move Session Management out
* of here
*/
private final ConcurrentMap sessions
= DataStructures.getConcurrentMap();
private final Random rnd = new Random();
/**
* Scheduled Thread that clean the cache every XX seconds.
*/
private final ScheduledThreadPoolExecutor sessionExpirer
= new ScheduledThreadPoolExecutor(1, new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
final Thread t = new Thread(r, "Grizzly-HttpSession-Expirer");
t.setDaemon(true);
return t;
}
});
{
sessionExpirer.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
long currentTime = System.currentTimeMillis();
Iterator> iterator = sessions.entrySet().iterator();
Map.Entry entry;
while (iterator.hasNext()) {
entry = iterator.next();
final Session session = entry.getValue();
if (!session.isValid()
|| (session.getSessionTimeout() > 0
&& currentTime - session.getTimestamp() > session.getSessionTimeout())) {
session.setValid(false);
iterator.remove();
}
}
}
}, 5, 5, TimeUnit.SECONDS);
}
private DefaultSessionManager() {
}
@Override
public Session getSession(final Request request,
String requestedSessionId) {
if (requestedSessionId != null) {
final Session session = sessions.get(requestedSessionId);
if (session != null && session.isValid()) {
return session;
}
}
return null;
}
@Override
public Session createSession(final Request request) {
final Session session = new Session();
String requestedSessionId;
do {
requestedSessionId = String.valueOf(generateRandomLong());
session.setIdInternal(requestedSessionId);
} while (sessions.putIfAbsent(requestedSessionId, session) != null);
return session;
}
@Override
public String changeSessionId(final Request request, final Session session) {
final String oldSessionId = session.getIdInternal();
final String newSessionId = String.valueOf(generateRandomLong());
session.setIdInternal(newSessionId);
sessions.remove(oldSessionId);
sessions.put(newSessionId, session);
return oldSessionId;
}
@Override
public void configureSessionCookie(final Request request,
final Cookie cookie) {
}
/**
* Returns pseudorandom positive long value.
*/
private long generateRandomLong() {
return (rnd.nextLong() & 0x7FFFFFFFFFFFFFFFL);
}
}