Tomcat example source code file (PersistentValve.java)

This example Tomcat source code file (PersistentValve.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

exception, http, io, ioexception, manager, persistentmanager, persistentmanager, request, response, servlet, session, session, staled, standardhost, store, store, string, string, truncate

The Tomcat PersistentValve.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.catalina.valves;


import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.Context;
import org.apache.catalina.Manager;
import org.apache.catalina.Session;
import org.apache.catalina.Store;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.core.StandardHost;
import org.apache.catalina.session.PersistentManager;
import org.apache.catalina.util.StringManager;


/**
 * Valve that implements the default basic behavior for the
 * <code>StandardHost container implementation.
 * <p>
 * <b>USAGE CONSTRAINT: To work correctly it requires a  PersistentManager.
 *
 * @author Jean-Frederic Clere
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class PersistentValve
    extends ValveBase {


    // ----------------------------------------------------- Instance Variables


    /**
     * The descriptive information related to this implementation.
     */
    private static final String info =
        "org.apache.catalina.valves.PersistentValve/1.0";


    /**
     * The string manager for this package.
     */
    private static final StringManager sm =
        StringManager.getManager(Constants.Package);


    // ------------------------------------------------------------- Properties


    /**
     * Return descriptive information about this Valve implementation.
     */
    public String getInfo() {

        return (info);

    }


    // --------------------------------------------------------- Public Methods


    /**
     * Select the appropriate child Context to process this request,
     * based on the specified request URI.  If no matching Context can
     * be found, return an appropriate HTTP error.
     *
     * @param request Request to be processed
     * @param response Response to be produced
     *
     * @exception IOException if an input/output error occurred
     * @exception ServletException if a servlet error occurred
     */
    public void invoke(Request request, Response response)
        throws IOException, ServletException {

        // Select the Context to be used for this Request
        StandardHost host = (StandardHost) getContainer();
        Context context = request.getContext();
        if (context == null) {
            response.sendError
                (HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                 sm.getString("standardHost.noContext"));
            return;
        }

        // Bind the context CL to the current thread
        Thread.currentThread().setContextClassLoader
            (context.getLoader().getClassLoader());

        // Update the session last access time for our session (if any)
        String sessionId = request.getRequestedSessionId();
        Manager manager = context.getManager();
        if (sessionId != null && manager != null) {
            if (manager instanceof PersistentManager) {
                Store store = ((PersistentManager) manager).getStore();
                if (store != null) {
                    Session session = null;
                    try {
                        session = store.load(sessionId);
                    } catch (Exception e) {
                        container.getLogger().error("deserializeError");
                    }
                    if (session != null) {
                        if (!session.isValid() ||
                            isSessionStale(session, System.currentTimeMillis())) {
                            if (container.getLogger().isDebugEnabled())
                                container.getLogger().debug("session swapped in is invalid or expired");
                            session.expire();
                            store.remove(sessionId);
                        } else {
                            session.setManager(manager);
                            // session.setId(sessionId); Only if new ???
                            manager.add(session);
                            // ((StandardSession)session).activate();
                            session.access();
                        }
                    }
                }
            }
        }
        if (container.getLogger().isDebugEnabled())
            container.getLogger().debug("sessionId: " + sessionId);

        // Ask the next valve to process the request.
        getNext().invoke(request, response);

        // Read the sessionid after the response.
        // HttpSession hsess = hreq.getSession(false);
        Session hsess;
        try {
            hsess = request.getSessionInternal();
        } catch (Exception ex) {
            hsess = null;
        }
        String newsessionId = null;
        if (hsess!=null)
            newsessionId = hsess.getIdInternal();

        if (container.getLogger().isDebugEnabled())
            container.getLogger().debug("newsessionId: " + newsessionId);
        if (newsessionId!=null) {
            /* store the session in the store and remove it from the manager */
            if (manager instanceof PersistentManager) {
                Session session = manager.findSession(newsessionId);
                Store store = ((PersistentManager) manager).getStore();
                if (store != null && session!=null &&
                    session.isValid() &&
                    !isSessionStale(session, System.currentTimeMillis())) {
                    // ((StandardSession)session).passivate();
                    store.save(session);
                    ((PersistentManager) manager).removeSuper(session);
                    session.recycle();
                } else {
                    if (container.getLogger().isDebugEnabled())
                        container.getLogger().debug("newsessionId store: " + store + " session: " +
                                session + " valid: " + session.isValid() +
                                " Staled: " +
                                isSessionStale(session, System.currentTimeMillis()));

                }
            } else {
                if (container.getLogger().isDebugEnabled())
                    container.getLogger().debug("newsessionId Manager: " + manager);
            }
        }
    }

    /**
     * Indicate whether the session has been idle for longer
     * than its expiration date as of the supplied time.
     *
     * FIXME: Probably belongs in the Session class.
     */
    protected boolean isSessionStale(Session session, long timeNow) {
 
        int maxInactiveInterval = session.getMaxInactiveInterval();
        if (maxInactiveInterval >= 0) {
            int timeIdle = // Truncate, do not round up
                (int) ((timeNow - session.getLastAccessedTime()) / 1000L);
            if (timeIdle >= maxInactiveInterval)
                return true;
        }
 
        return false;
 
    }

}