/**
* Returns a session from the session store, returning null if there's no cached session.
*
* @param key the session id
* @param now the time in milliseconds. now == 0 implies that we're just checking for the
* existence of such a session in the cache and do not intend actually to load it if it is
* not.
* @return the cached session.
*/
public SessionArrayValue getSession(Env env, String key, long now) {
SessionArrayValue session;
boolean isNew = false;
boolean killSession = false;
if (_sessions == null) return null;
// Check the cache first
session = _sessions.get(key);
if (session != null && !session.getId().equals(key))
throw new IllegalStateException(key + " != " + session.getId());
if (session != null) {
if (session.inUse()) {
System.out.println("USE:" + isNew);
return (SessionArrayValue) session.copy(env);
}
}
if (session == null) return null;
if (isNew) {
isNew = !load(env, session, now);
System.out.println("LOAD:" + isNew);
} else if (!getSaveOnlyOnShutdown() && !session.load()) {
// if the load failed, then the session died out from underneath
session.reset(now);
isNew = true;
}
if (!isNew) session.setAccess(now);
return (SessionArrayValue) session.copy(env);
}
public void saveSession(Env env, SessionArrayValue session) {
SessionArrayValue copy = (SessionArrayValue) session.copy(env);
_sessions.put(session.getId(), copy);
session.finish();
if (_persistentStore != null) {
_persistentStore.put(session.getId(), copy.encode(env));
}
}
/**
* Creates a session. It's already been established that the key does not currently have a
* session.
*/
protected SessionArrayValue create(Env env, String key, long now) {
SessionArrayValue session = createSessionValue(key, now, _sessionTimeout);
load(env, session, now);
// If another thread has created and stored a new session,
// putIfNew will return the old session
session = _sessions.putIfNew(key, session);
if (!key.equals(session.getId()))
throw new IllegalStateException(key + " != " + session.getId());
return (SessionArrayValue) session.copy(env);
}
/**
* Loads the session from the backing store.
*
* @param session the session to load.
* @param now current time in milliseconds. now == 0 implies that we're just checking for the
* existence of such a session in the cache and do not intend actually to load it if it is
* not.
*/
protected boolean load(Env env, SessionArrayValue session, long now) {
try {
if (session.inUse()) {
return true;
} else if (now <= 0) {
return false;
}
if (_persistentStore != null) {
String encoded = (String) _persistentStore.get(session.getId());
if (encoded != null) {
session.decode(env, new StringBuilderValue(encoded));
}
}
if (session.load()) {
session.setAccess(now);
return true;
} else {
session.reset(now);
}
} catch (Exception e) {
log.log(Level.FINE, e.toString(), e);
session.reset(now);
}
return false;
}
/** Timeout for reaping old sessions. */
public void handleAlarm(Alarm alarm) {
try {
_sessionList.clear();
int liveSessions = 0;
if (_isClosed) return;
long now = Alarm.getCurrentTime();
synchronized (_sessions) {
_sessionIter = _sessions.values(_sessionIter);
while (_sessionIter.hasNext()) {
SessionArrayValue session = _sessionIter.next();
long maxIdleTime = session.getMaxInactiveInterval();
if (session.inUse()) liveSessions++;
else if (session.getAccessTime() + maxIdleTime < now) _sessionList.add(session);
else liveSessions++;
}
}
synchronized (_statisticsLock) {
_sessionTimeoutCount += _sessionList.size();
}
for (int i = 0; i < _sessionList.size(); i++) {
SessionArrayValue session = _sessionList.get(i);
try {
long maxIdleTime = session.getMaxInactiveInterval();
_sessions.remove(session.getId());
session.invalidate();
} catch (Throwable e) {
log.log(Level.FINER, e.toString(), e);
}
}
} finally {
if (!_isClosed) alarm.queue(60000);
}
}
/** Cleans up the sessions when the Application shuts down gracefully. */
public void close() {
synchronized (this) {
if (_isClosed) return;
_isClosed = true;
}
if (_sessions == null) return;
// _alarm.dequeue();
_sessionList.clear();
ArrayList<SessionArrayValue> list = new ArrayList<SessionArrayValue>();
boolean isError = false;
synchronized (_sessions) {
_sessionIter = _sessions.values(_sessionIter);
while (_sessionIter.hasNext()) {
SessionArrayValue session = _sessionIter.next();
if (session.isValid()) list.add(session);
}
}
for (int i = list.size() - 1; i >= 0; i--) {
SessionArrayValue session = list.get(i);
try {
if (session.isValid()) {
synchronized (session) {
if (!session.isEmpty()) session.storeOnShutdown();
}
}
_sessions.remove(session.getId());
} catch (Exception e) {
if (!isError) log.log(Level.WARNING, "Can't store session: " + e, e);
isError = true;
}
}
}