contentcache.java

这是linux下ssl vpn的实现程序

/*
 */
package com.sslexplorer.replacementproxy;

import java.io.File;

import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;

import org.apache.commons.cache.SimpleCache;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.sslexplorer.core.CoreServlet;
import com.sslexplorer.security.User;

public class ContentCache extends SimpleCache implements HttpSessionBindingListener {

    final static Log log = LogFactory.getLog(ContentCache.class);

    ContentStash contentStash;
    User user;
    File cacheDir;

    public ContentCache(User user, File cacheDir, int maxMB, int maxObjects) {
        this(user, new ContentStash(1024 * 1024 * maxMB, maxObjects, cacheDir, 20, true));
        this.cacheDir = cacheDir;
        if (log.isInfoEnabled())
        	log.info("Created new cache at " + cacheDir.getAbsolutePath() + " for " + user.getPrincipalName() + " of capacity "
                        + contentStash.capacity() + ".");
    }

    private ContentCache(User user, ContentStash stash) {
        super(stash);
        contentStash = (ContentStash) stash;
        this.user = user;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.http.HttpSessionBindingListener#valueBound(javax.servlet.http.HttpSessionBindingEvent)
     */
    public void valueBound(HttpSessionBindingEvent arg0) {
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.http.HttpSessionBindingListener#valueUnbound(javax.servlet.http.HttpSessionBindingEvent)
     */
    public void valueUnbound(HttpSessionBindingEvent arg0) {
        try {
            if (!"true".equals(CoreServlet.getServlet().getPropertyDatabase().getProperty(0, null,
                "webForwards.cache.clearOnLogout"))) {
                return;
            }
        } catch (Exception e) {
        }
        if (log.isInfoEnabled())
        	log.info("Clearing content cache for " + user.getPrincipalName());
        contentStash.clear();
        if (log.isInfoEnabled())
        	log.info("Cleared content cache for " + user.getPrincipalName());
    }

}