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package org.apache.catalina.connector;
import org.apache.catalina.Session;
import org.apache.catalina.SessionEvent;
import org.apache.catalina.SessionListener;
import java.util.ArrayList;
/**
* Class responsible for keeping track of the total number of active sessions
* associated with an HTTP request.
*
* A given HTTP request may be associated with more than one active
* session if it has been dispatched to one or more foreign contexts.
*
*
The number of active sessions being tracked is used to determine whether
* or not any session information needs to be reflected in the response (e.g.,
* in the form of a response cookie). If no active sessions are associated
* with the request by the time the response is committed, no session
* information will be reflected in the response.
*
* See GlassFish Issue 896 for additional details.
*/
public class SessionTracker implements SessionListener {
// The number of currently tracked sessions
private volatile int count;
// The session id that is shared by all tracked sessions
private volatile String trackedSessionId;
private Response response;
/*
* The list of contexts whose sessions we're tracking.
*
* The size of this list will be greater than one only in cross
* context request dispatch scenarios
*/
private ArrayList contextNames = new ArrayList(2);
/**
* Processes the given session event, by unregistering this SessionTracker
* as a session listener from the session that is the source of the event,
* and by decrementing the counter of currently tracked sessions.
*
* @param event The session event
*/
public void sessionEvent(SessionEvent event) {
if (!Session.SESSION_DESTROYED_EVENT.equals(event.getType())) {
return;
}
Session session = event.getSession();
synchronized (this) {
if (session.getIdInternal() != null
&& session.getIdInternal().equals(trackedSessionId)
&& session.getManager() != null
&& session.getManager().getContainer() != null
&& contextNames.contains(
session.getManager().getContainer().getName())) {
count--;
if (count == 0) {
trackedSessionId = null;
if (response != null) {
response.removeSessionCookies();
}
}
}
session.removeSessionListener(this);
}
}
/**
* Gets the number of active sessions that are being tracked.
*
* @return The number of active sessions being tracked
*/
public int getActiveSessions() {
return count;
}
/**
* Gets the id of the sessions that are being tracked.
*
* Notice that since all sessions are associated with the same request,
* albeit in different context, they all share the same id.
*
* @return The id of the sessions that are being tracked
*/
public String getSessionId() {
return trackedSessionId;
}
/**
* Tracks the given session, by registering this SessionTracker as a
* listener with the given session, and by incrementing the counter of
* currently tracked sessions.
*
* @param session The session to track
*/
public synchronized void track(Session session) {
if (trackedSessionId == null) {
trackedSessionId = session.getIdInternal();
} else if (!trackedSessionId.equals(session.getIdInternal())) {
throw new IllegalArgumentException("Should never reach here");
}
count++;
if (session.getManager() != null
&& session.getManager().getContainer() != null
&& session.getManager().getContainer().getName() != null) {
contextNames.add(session.getManager().getContainer().getName());
}
session.addSessionListener(this);
}
/**
* Associates the given response with this SessionTracker.
*
* If the number of tracked sessions drops to zero, this SessionTracker
* will remove the Set-Cookie from the given response.
*
* @param response The response from which to remove the Set-Cookie
* header if the number of tracked sessions drops to zero
*/
public synchronized void setResponse(Response response) {
this.response = response;
}
/**
* Resets this session tracker.
*/
public synchronized void reset() {
count = 0;
trackedSessionId = null;
contextNames.clear();
}
}