/**
* Reinstantiates a serialized session from the data passed in. This will first call
* createSession() so that we get a fresh instance with all the managers set and all the transient
* fields validated. Then it calls Session.readObjectData(byte[]) to deserialize the object
*
* @param data - a byte array containing session data
* @return a valid Session object, null if an error occurs
*/
protected Session readSession(byte[] data, String sessionId) {
try {
ReplicationStream session_in = getReplicationStream(data);
Session session = sessionId != null ? this.findSession(sessionId) : null;
boolean isNew = (session == null);
// clear the old values from the existing session
if (session != null) {
ReplicatedSession rs = (ReplicatedSession) session;
rs.expire(false); // cleans up the previous values, since we are not doing removes
session = null;
} // end if
if (session == null) {
session = createSession(null, false, false);
sessions.remove(session.getIdInternal());
}
boolean hasPrincipal = session_in.readBoolean();
SerializablePrincipal p = null;
if (hasPrincipal) p = (SerializablePrincipal) session_in.readObject();
((ReplicatedSession) session).readObjectData(session_in);
if (hasPrincipal) session.setPrincipal(p.getPrincipal(getContainer().getRealm()));
((ReplicatedSession) session).setId(sessionId, isNew);
ReplicatedSession rsession = (ReplicatedSession) session;
rsession.setAccessCount(1);
session.setManager(this);
session.setValid(true);
rsession.setLastAccessedTime(System.currentTimeMillis());
rsession.setThisAccessedTime(System.currentTimeMillis());
((ReplicatedSession) session).setAccessCount(0);
session.setNew(false);
if (log.isTraceEnabled())
log.trace(
"Session loaded id="
+ sessionId
+ " actualId="
+ session.getId()
+ " exists="
+ this.sessions.containsKey(sessionId)
+ " valid="
+ rsession.isValid());
return session;
} catch (Exception x) {
log.error("Failed to deserialize the session!", x);
}
return null;
}
public ClusterMessage requestCompleted(String sessionId) {
if (!getDistributable()) {
log.warn(
"Received requestCompleted message, although this context["
+ getName()
+ "] is not distributable. Ignoring message");
return null;
}
try {
if (invalidatedSessions.get(sessionId) != null) {
synchronized (invalidatedSessions) {
invalidatedSessions.remove(sessionId);
SessionMessage msg =
new SessionMessageImpl(
name, SessionMessage.EVT_SESSION_EXPIRED, null, sessionId, sessionId);
return msg;
}
} else {
ReplicatedSession session = (ReplicatedSession) findSession(sessionId);
if (session != null) {
// return immediately if the session is not dirty
if (useDirtyFlag && (!session.isDirty())) {
// but before we return doing nothing,
// see if we should send
// an updated last access message so that
// sessions across cluster dont expire
long interval = session.getMaxInactiveInterval();
long lastaccdist = System.currentTimeMillis() - session.getLastAccessWasDistributed();
if (((interval * 1000) / lastaccdist) < 3) {
SessionMessage accmsg =
new SessionMessageImpl(
name, SessionMessage.EVT_SESSION_ACCESSED, null, sessionId, sessionId);
session.setLastAccessWasDistributed(System.currentTimeMillis());
return accmsg;
}
return null;
}
session.setIsDirty(false);
if (log.isDebugEnabled()) {
try {
log.debug("Sending session to cluster=" + session);
} catch (Exception ignore) {
}
}
SessionMessage msg =
new SessionMessageImpl(
name,
SessionMessage.EVT_SESSION_CREATED,
writeSession(session),
session.getIdInternal(),
session.getIdInternal());
return msg;
} // end if
} // end if
} catch (Exception x) {
log.error("Unable to replicate session", x);
}
return null;
}
/**
* Serialize a session into a byte array<br>
* This method simple calls the writeObjectData method on the session and returns the byte data
* from that call
*
* @param session - the session to be serialized
* @return a byte array containing the session data, null if the serialization failed
*/
protected byte[] writeSession(Session session) {
try {
java.io.ByteArrayOutputStream session_data = new java.io.ByteArrayOutputStream();
java.io.ObjectOutputStream session_out = new java.io.ObjectOutputStream(session_data);
session_out.flush();
boolean hasPrincipal = session.getPrincipal() != null;
session_out.writeBoolean(hasPrincipal);
if (hasPrincipal) {
session_out.writeObject(
SerializablePrincipal.createPrincipal((GenericPrincipal) session.getPrincipal()));
} // end if
((ReplicatedSession) session).writeObjectData(session_out);
return session_data.toByteArray();
} catch (Exception x) {
log.error("Failed to serialize the session!", x);
}
return null;
}
/**
* Creates a HTTP session. Most of the code in here is copied from the StandardManager. This is
* not pretty, yeah I know, but it was necessary since the StandardManager had hard coded the
* session instantiation to the a StandardSession, when we actually want to instantiate a
* ReplicatedSession<br>
* If the call comes from the Tomcat servlet engine, a SessionMessage goes out to the other nodes
* in the cluster that this session has been created.
*
* @param notify - if set to true the other nodes in the cluster will be notified. This flag is
* needed so that we can create a session before we deserialize a replicated one
* @see ReplicatedSession
*/
protected Session createSession(String sessionId, boolean notify, boolean setId) {
// inherited from the basic manager
if ((getMaxActiveSessions() >= 0) && (sessions.size() >= getMaxActiveSessions())) {
throw new TooManyActiveSessionsException(
sm.getString("standardManager.createSession.ise"), getMaxActiveSessions());
}
Session session = new ReplicatedSession(this);
// Initialize the properties of the new session and return it
session.setNew(true);
session.setValid(true);
session.setCreationTime(System.currentTimeMillis());
session.setMaxInactiveInterval(this.maxInactiveInterval);
if (sessionId == null) sessionId = generateSessionId();
if (setId) session.setId(sessionId);
if (notify && (cluster != null)) {
((ReplicatedSession) session).setIsDirty(true);
}
return (session);
} // createSession
/**
* This method is called by the received thread when a SessionMessage has been received from one
* of the other nodes in the cluster.
*
* @param msg - the message received
* @param sender - the sender of the message, this is used if we receive a EVT_GET_ALL_SESSION
* message, so that we only reply to the requesting node
*/
protected void messageReceived(SessionMessage msg, Member sender) {
try {
if (log.isInfoEnabled()) {
log.debug("Received SessionMessage of type=" + msg.getEventTypeString());
log.debug("Received SessionMessage sender=" + sender);
}
switch (msg.getEventType()) {
case SessionMessage.EVT_GET_ALL_SESSIONS:
{
// get a list of all the session from this manager
Object[] sessions = findSessions();
java.io.ByteArrayOutputStream bout = new java.io.ByteArrayOutputStream();
java.io.ObjectOutputStream oout = new java.io.ObjectOutputStream(bout);
oout.writeInt(sessions.length);
for (int i = 0; i < sessions.length; i++) {
ReplicatedSession ses = (ReplicatedSession) sessions[i];
oout.writeUTF(ses.getIdInternal());
byte[] data = writeSession(ses);
oout.writeObject(data);
} // for
// don't send a message if we don't have to
oout.flush();
oout.close();
byte[] data = bout.toByteArray();
SessionMessage newmsg =
new SessionMessageImpl(
name,
SessionMessage.EVT_ALL_SESSION_DATA,
data,
"SESSION-STATE",
"SESSION-STATE-" + getName());
cluster.send(newmsg, sender);
break;
}
case SessionMessage.EVT_ALL_SESSION_DATA:
{
java.io.ByteArrayInputStream bin = new java.io.ByteArrayInputStream(msg.getSession());
java.io.ObjectInputStream oin = new java.io.ObjectInputStream(bin);
int size = oin.readInt();
for (int i = 0; i < size; i++) {
String id = oin.readUTF();
byte[] data = (byte[]) oin.readObject();
Session session = readSession(data, id);
} // for
stateTransferred = true;
break;
}
case SessionMessage.EVT_SESSION_CREATED:
{
Session session = this.readSession(msg.getSession(), msg.getSessionID());
if (log.isDebugEnabled()) {
log.debug("Received replicated session=" + session + " isValid=" + session.isValid());
}
break;
}
case SessionMessage.EVT_SESSION_EXPIRED:
{
Session session = findSession(msg.getSessionID());
if (session != null) {
session.expire();
this.remove(session);
} // end if
break;
}
case SessionMessage.EVT_SESSION_ACCESSED:
{
Session session = findSession(msg.getSessionID());
if (session != null) {
session.access();
session.endAccess();
}
break;
}
default:
{
// we didn't recognize the message type, do nothing
break;
}
} // switch
} catch (Exception x) {
log.error("Unable to receive message through TCP channel", x);
}
}
