clickstreamlistener.java

clickstream是开源的JAVA项目

package com.opensymphony.clickstream;

import com.opensymphony.util.Logger;
import com.opensymphony.clickstream.logger.ClickstreamLoggerFactory;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import java.util.HashMap;
import java.util.Map;

/**
 * The listener that keeps track of all clickstreams in the container as well
 * as the creating new Clickstream objects and initiating logging when the
 * clickstream dies (session has been invalidated).
 *
 * @author <a href="[e-mail]">Patrick Lightbody</a>
 */
public class ClickstreamListener implements ServletContextListener, HttpSessionListener {
    private static Logger log = new Logger(ClickstreamListener.class);

    private Map clickstreams = new HashMap();

    public ClickstreamListener() {
        log.debug("ClickstreamLogger constructed");
    }

    public void contextInitialized(ServletContextEvent sce) {
        log.debug("ServletContext Initialised");
        sce.getServletContext().setAttribute("clickstreams", clickstreams);
    }

    public void contextDestroyed(ServletContextEvent sce) {
        sce.getServletContext().setAttribute("clickstreams", null);
        log.debug("ServletContext Destroyed");
    }

    public void sessionCreated(HttpSessionEvent hse) {
        log.debug("Session Created");
        HttpSession session = hse.getSession();
        Clickstream clickstream = new Clickstream();
        session.setAttribute("clickstream", clickstream);
        clickstreams.put(session.getId(), clickstream);
    }

    public void sessionDestroyed(HttpSessionEvent hse) {
        log.debug("Session Destroyed");
        HttpSession session = hse.getSession();
        Clickstream stream = (Clickstream) session.getAttribute("clickstream");
        ClickstreamLoggerFactory.getLogger().log(stream);
        clickstreams.remove(session.getId());
    }
}