standardmanager.java

这是一个法律事务所系统源码

/*
 * $Header: /home/cvs/jakarta-tomcat/src/share/org/apache/tomcat/session/Attic/StandardManager.java,v 1.11.2.1 2000/11/18 01:33:59 craigmcc Exp $
 * $Revision: 1.11.2.1 $
 * $Date: 2000/11/18 01:33:59 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
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 */ 


package org.apache.tomcat.session;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpSession;
import org.apache.tomcat.util.*;
import org.apache.tomcat.core.Request;

/**
 * Standard implementation of the <b>Manager</b> interface that provides
 * no session persistence or distributable capabilities, but does support
 * an optional, configurable, maximum number of active sessions allowed.
 * <p>
 * Lifecycle configuration of this component assumes an XML node
 * in the following format:
 * <code>
 *     &lt;Manager className="org.apache.tomcat.session.StandardManager"
 *              checkInterval="60" maxActiveSessions="-1"
 *              maxInactiveInterval="-1" />
 * </code>
 * where you can adjust the following parameters, with default values
 * in square brackets:
 * <ul>
 * <li><b>checkInterval</b> - The interval (in seconds) between background
 *     thread checks for expired sessions.  [60]
 * <li><b>maxActiveSessions</b> - The maximum number of sessions allowed to
 *     be active at once, or -1 for no limit.  [-1]
 * <li><b>maxInactiveInterval</b> - The default maximum number of seconds of
 *     inactivity before which the servlet container is allowed to time out
 *     a session, or -1 for no limit.  This value should be overridden from
 *     the default session timeout specified in the web application deployment
 *     descriptor, if any.  [-1]
 * </ul>
 *
 * @author Craig R. McClanahan
 * @author [e-mail]
 * @author <a href="mailto:[e-mail]">Jon S. Stevens</a>
 * @author Shai Fultheim [[e-mail]]
 * @version $Revision: 1.11.2.1 $ $Date: 2000/11/18 01:33:59 $
 */
public final class StandardManager implements Runnable  {
    // ----------------------------------------------------- Instance Variables
    /**
     * The distributable flag for Sessions created by this Manager.  If this
     * flag is set to <code>true</code>, any user attributes added to a
     * session controlled by this Manager must be Serializable.
     */
    protected boolean distributable;

    /**
     * The default maximum inactive interval for Sessions created by
     * this Manager.
     */
    protected int maxInactiveInterval = 60;

    /**
     * The set of previously recycled Sessions for this Manager.
     */
    protected Vector recycled = new Vector();

    /**
     * The set of currently active Sessions for this Manager, keyed by
     * session identifier.
     */
    protected Hashtable sessions = new Hashtable();

    /**
     * The interval (in seconds) between checks for expired sessions.
     */
    private int checkInterval = 60;

    /**
     * The maximum number of active Sessions allowed, or -1 for no limit.
     */
    protected int maxActiveSessions = -1;

    /**
     * The string manager for this package.
     */
    private static StringManager sm =
        StringManager.getManager("org.apache.tomcat.session");

    /**
     * The background thread.
     */
    private Thread thread = null;

    /**
     * The background thread completion semaphore.
     */
    private boolean threadDone = false;

    /**
     * Name to register for the background thread.
     */
    private String threadName = "StandardManager";

    // ------------------------------------------------------------- Constructor

    public StandardManager() {
    }

    // ------------------------------------------------------------- Properties
    /**
     * Return the distributable flag for the sessions supported by
     * this Manager.
     */
    public boolean getDistributable() {
	return (this.distributable);
    }

    /**
     * Set the distributable flag for the sessions supported by this
     * Manager.  If this flag is set, all user data objects added to
     * sessions associated with this manager must implement Serializable.
     *
     * @param distributable The new distributable flag
     */
    public void setDistributable(boolean distributable) {
	this.distributable = distributable;
    }

    /**
     * Return the default maximum inactive interval (in seconds)
     * for Sessions created by this Manager.
     */
    public int getMaxInactiveInterval() {
	return (this.maxInactiveInterval);
    }

    /**
     * Set the default maximum inactive interval (in seconds)
     * for Sessions created by this Manager.
     *
     * @param interval The new default value
     */
    public void setMaxInactiveInterval(int interval) {
	this.maxInactiveInterval = interval;
    }

    /**
     * Used by context to configure the session manager's inactivity timeout.
     *
     * The SessionManager may have some default session time out, the
     * Context on the other hand has it's timeout set by the deployment
     * descriptor (web.xml). This method lets the Context conforgure the
     * session manager according to this value.
     *
     * @param minutes The session inactivity timeout in minutes.
     */
    public void setSessionTimeOut(int minutes) {
        if(-1 != minutes) {
            // The manager works with seconds...
            setMaxInactiveInterval(minutes * 60);
        }
    }

    /**
     * Return the check interval (in seconds) for this Manager.
     */
    public int getCheckInterval() {
	return (this.checkInterval);
    }

    /**
     * Set the check interval (in seconds) for this Manager.
     *
     * @param checkInterval The new check interval
     */
    public void setCheckInterval(int checkInterval) {
	this.checkInterval = checkInterval;
    }

    /**
     * Return the maximum number of active Sessions allowed, or -1 for
     * no limit.
     */
    public int getMaxActiveSessions() {
	return (this.maxActiveSessions);
    }

    /**
     * Set the maximum number of actives Sessions allowed, or -1 for
     * no limit.
     *
     * @param max The new maximum number of sessions
     */
    public void setMaxActiveSessions(int max) {
	this.maxActiveSessions = max;
    }

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

    /**
     * Mark the specified session's last accessed time.  This should be
     * called for each request by a RequestInterceptor.
     *
     * @param session The session to be marked
     */
    public void access( HttpSession session ) {
	((StandardSession) session).access();
    }

    /** Notify that the servlet that acccessed the session is done
     */
    public void release( HttpSession session ) {
    }

    /**
     * Return the active Session, associated with this Manager, with the
     * specified session id (if any); otherwise return <code>null</code>.