persistentmanagerbase.java

This temp directory is used by the JVM for temporary file storage. The JVM is configured to use thi

        if (log.isDebugEnabled())
            log.debug(sm.getString("persistentManager.unloading",
                             String.valueOf(n)));

        for (int i = 0; i < n; i++)
            try {
                swapOut(sessions[i]);
            } catch (IOException e) {
                ;   // This is logged in writeSession()
            }

    }


    // ------------------------------------------------------ Protected Methods


    /**
     * Look for a session in the Store and, if found, restore
     * it in the Manager's list of active sessions if appropriate.
     * The session will be removed from the Store after swapping
     * in, but will not be added to the active session list if it
     * is invalid or past its expiration.
     */
    protected Session swapIn(String id) throws IOException {

        if (store == null)
            return null;

        Session session = null;
        try {
            if (System.getSecurityManager() != null){
                try{
                    session = (Session) AccessController.doPrivileged(new PrivilegedStoreLoad(id));
                }catch(PrivilegedActionException ex){
                    Exception exception = ex.getException();
                    log.error("Exception clearing the Store: " + exception);
                    if (exception instanceof IOException){
                        throw (IOException)exception;
                    } else if (exception instanceof ClassNotFoundException) {
                        throw (ClassNotFoundException)exception;
                    }
                }
            } else {
                 session = store.load(id);
            }   
        } catch (ClassNotFoundException e) {
            log.error(sm.getString("persistentManager.deserializeError", id, e));
            throw new IllegalStateException
                (sm.getString("persistentManager.deserializeError", id, e));
        }

        if (session == null)
            return (null);

        if (!session.isValid()) {
            log.error("session swapped in is invalid or expired");
            session.expire();
            removeSession(id);
            return (null);
        }

        if(log.isDebugEnabled())
            log.debug(sm.getString("persistentManager.swapIn", id));

        session.setManager(this);
        // make sure the listeners know about it.
        ((StandardSession)session).tellNew();
        add(session);
        ((StandardSession)session).activate();
        session.endAccess();

        return (session);

    }


    /**
     * Remove the session from the Manager's list of active
     * sessions and write it out to the Store. If the session
     * is past its expiration or invalid, this method does
     * nothing.
     *
     * @param session The Session to write out.
     */
    protected void swapOut(Session session) throws IOException {

        if (store == null || !session.isValid()) {
            return;
        }

        ((StandardSession)session).passivate();
        writeSession(session);
        super.remove(session);
        session.recycle();

    }


    /**
     * Write the provided session to the Store without modifying
     * the copy in memory or triggering passivation events. Does
     * nothing if the session is invalid or past its expiration.
     */
    protected void writeSession(Session session) throws IOException {

        if (store == null || !session.isValid()) {
            return;
        }

        try {
            if (System.getSecurityManager() != null){
                try{
                    AccessController.doPrivileged(new PrivilegedStoreSave(session));
                }catch(PrivilegedActionException ex){
                    Exception exception = ex.getException();
                    log.error("Exception clearing the Store: " + exception);
                    exception.printStackTrace();                        
                }
            } else {
                 store.save(session);
            }   
        } catch (IOException e) {
            log.error(sm.getString
                ("persistentManager.serializeError", session.getId(), e));
            throw e;
        }

    }


    // ------------------------------------------------------ Lifecycle Methods


    /**
     * Add a lifecycle event listener to this component.
     *
     * @param listener The listener to add
     */
    public void addLifecycleListener(LifecycleListener listener) {

        lifecycle.addLifecycleListener(listener);

    }


    /**
     * Get the lifecycle listeners associated with this lifecycle. If this 
     * Lifecycle has no listeners registered, a zero-length array is returned.
     */
    public LifecycleListener[] findLifecycleListeners() {

        return lifecycle.findLifecycleListeners();

    }


    /**
     * Remove a lifecycle event listener from this component.
     *
     * @param listener The listener to remove
     */
    public void removeLifecycleListener(LifecycleListener listener) {

        lifecycle.removeLifecycleListener(listener);

    }


    /**
     * Prepare for the beginning of active use of the public methods of this
     * component.  This method should be called after <code>configure()</code>,
     * and before any of the public methods of the component are utilized.
     *
     * @exception LifecycleException if this component detects a fatal error
     *  that prevents this component from being used
     */
    public void start() throws LifecycleException {

        // Validate and update our current component state
        if (started) {
            log.info(sm.getString("standardManager.alreadyStarted"));
            return;
        }
        if( ! initialized )
            init();
        
        lifecycle.fireLifecycleEvent(START_EVENT, null);
        started = true;

        // Force initialization of the random number generator
        if (log.isDebugEnabled())
            log.debug("Force random number initialization starting");
        String dummy = generateSessionId();
        if (log.isDebugEnabled())
            log.debug("Force random number initialization completed");

        if (store == null)
            log.error("No Store configured, persistence disabled");
        else if (store instanceof Lifecycle)
            ((Lifecycle)store).start();

    }


    /**
     * Gracefully terminate the active use of the public methods of this
     * component.  This method should be the last one called on a given
     * instance of this component.
     *
     * @exception LifecycleException if this component detects a fatal error
     *  that needs to be reported
     */
   public void stop() throws LifecycleException {

        if (log.isDebugEnabled())
            log.debug("Stopping");

        // Validate and update our current component state
        if (!isStarted()) {
            log.info(sm.getString("standardManager.notStarted"));
            return;
        }
        
        lifecycle.fireLifecycleEvent(STOP_EVENT, null);
        setStarted(false);

        if (getStore() != null && saveOnRestart) {
            unload();
        } else {
            // Expire all active sessions
            Session sessions[] = findSessions();
            for (int i = 0; i < sessions.length; i++) {
                StandardSession session = (StandardSession) sessions[i];
                if (!session.isValid())
                    continue;
                session.expire();
            }
        }

        if (getStore() != null && getStore() instanceof Lifecycle)
            ((Lifecycle)getStore()).stop();

        // Require a new random number generator if we are restarted
        this.random = null;

        if( initialized )
            destroy();

    }


    // ----------------------------------------- PropertyChangeListener Methods


    /**
     * Process property change events from our associated Context.
     *
     * @param event The property change event that has occurred
     */
    public void propertyChange(PropertyChangeEvent event) {

        // Validate the source of this event
        if (!(event.getSource() instanceof Context))
            return;
        Context context = (Context) event.getSource();

        // Process a relevant property change
        if (event.getPropertyName().equals("sessionTimeout")) {
            try {
                setMaxInactiveInterval
                    ( ((Integer) event.getNewValue()).intValue()*60 );
            } catch (NumberFormatException e) {
                log.error(sm.getString("standardManager.sessionTimeout",
                                 event.getNewValue().toString()));
            }
        }

    }


    // ------------------------------------------------------ Protected Methods


    /**
     * Swap idle sessions out to Store if they are idle too long.
     */
    protected void processMaxIdleSwaps() {

        if (!isStarted() || maxIdleSwap < 0)
            return;

        Session sessions[] = findSessions();
        long timeNow = System.currentTimeMillis();

        // Swap out all sessions idle longer than maxIdleSwap
        // FIXME: What's preventing us from mangling a session during
        // a request?
        if (maxIdleSwap >= 0) {
            for (int i = 0; i < sessions.length; i++) {
                StandardSession session = (StandardSession) sessions[i];
                if (!session.isValid())
                    continue;
                int timeIdle = // Truncate, do not round up
                    (int) ((timeNow - session.getLastAccessedTime()) / 1000L);
                if (timeIdle > maxIdleSwap && timeIdle > minIdleSwap) {
                    if (log.isDebugEnabled())
                        log.debug(sm.getString
                            ("persistentManager.swapMaxIdle",
                             session.getId(), new Integer(timeIdle)));
                    try {
                        swapOut(session);
                    } catch (IOException e) {
                        ;   // This is logged in writeSession()
                    }
                }
            }
        }

    }


    /**
     * Swap idle sessions out to Store if too many are active
     */
    protected void processMaxActiveSwaps() {

        if (!isStarted() || getMaxActiveSessions() < 0)
            return;

        Session sessions[] = findSessions();

        // FIXME: Smarter algorithm (LRU)
        if (getMaxActiveSessions() >= sessions.length)
            return;

        if(log.isDebugEnabled())
            log.debug(sm.getString
                ("persistentManager.tooManyActive",
                 new Integer(sessions.length)));

        int toswap = sessions.length - getMaxActiveSessions();
        long timeNow = System.currentTimeMillis();

        for (int i = 0; i < sessions.length && toswap > 0; i++) {
            int timeIdle = // Truncate, do not round up
                (int) ((timeNow - sessions[i].getLastAccessedTime()) / 1000L);
            if (timeIdle > minIdleSwap) {
                if(log.isDebugEnabled())
                    log.debug(sm.getString
                        ("persistentManager.swapTooManyActive",
                         sessions[i].getId(), new Integer(timeIdle)));
                try {
                    swapOut(sessions[i]);
                } catch (IOException e) {
                    ;   // This is logged in writeSession()
                }
                toswap--;
            }
        }

    }


    /**
     * Back up idle sessions.
     */
    protected void processMaxIdleBackups() {

        if (!isStarted() || maxIdleBackup < 0)
            return;

        Session sessions[] = findSessions();
        long timeNow = System.currentTimeMillis();

        // Back up all sessions idle longer than maxIdleBackup
        if (maxIdleBackup >= 0) {
            for (int i = 0; i < sessions.length; i++) {
                StandardSession session = (StandardSession) sessions[i];
                if (!session.isValid())
                    continue;
                int timeIdle = // Truncate, do not round up
                    (int) ((timeNow - session.getLastAccessedTime()) / 1000L);
                if (timeIdle > maxIdleBackup) {
                    if (log.isDebugEnabled())
                        log.debug(sm.getString
                            ("persistentManager.backupMaxIdle",
                            session.getId(), new Integer(timeIdle)));

                    try {
                        writeSession(session);
                    } catch (IOException e) {
                        ;   // This is logged in writeSession()
                    }
                }
            }
        }

    }


}