source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/service/UserTracker.java

package org.greenstone.gsdl3.service;

import java.io.File;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;

import org.apache.log4j.Logger;
import org.greenstone.gsdl3.util.DerbyWrapper;
import org.greenstone.gsdl3.util.GSXML;
import org.greenstone.gsdl3.util.XMLConverter;
import org.greenstone.util.GlobalProperties;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class UserTracker extends ServiceRack
{
    static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.UserTracker.class.getName());

    /**************************************************
     * The list of services the User Tracker supports *
     *************************************************/
    protected static final String RECORD_USER_ACTION = "RecordUserAction";
    protected static final String GET_ACTIVITY_ON_PAGE = "GetActivityOnPage";
    /*************************************************/

    String[] services = { RECORD_USER_ACTION, GET_ACTIVITY_ON_PAGE };

  // the parameters these services use
  protected static final String USER_PARAM = "username";
  protected static final String COLLECTION_PARAM = "collection";
  protected static final String SITE_PARAM = "site";
  protected static final String OID_PARAM = "oid";
  protected static final String ACTION_PARAM = "action";
  
    /** configure this service */
    public boolean configure(Element info, Element extra_info)
    {
        if (!super.configure(info, extra_info))
        {
            return false;
        }

        logger.info("Configuring UserTracker...");
        this.config_info = info;

        for (int i = 0; i < services.length; i++)
        {
            Element service = this.desc_doc.createElement(GSXML.SERVICE_ELEM);
            service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
            service.setAttribute(GSXML.NAME_ATT, services[i]);
            this.short_service_info.appendChild(service);
        }

        // should any of the params be saved to the session?
        // assuming not at this stage. But if they do need to be, then
        // sture them here in save_params.
        // this.save_params.add(XXX_PARAM);
        return true;
    }

    protected Element getServiceDescription(Document doc, String service_id, String lang, String subset)
    {
        for (int i = 0; i < services.length; i++)
        {
            if (service_id.equals(services[i]))
            {
                Element service_elem = doc.createElement(GSXML.SERVICE_ELEM);
                service_elem.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
                service_elem.setAttribute(GSXML.NAME_ATT, services[i]);
                return service_elem;
            }
        }

        return null;
    }

    protected synchronized Element processRecordUserAction(Element request)
    {
      Document result_doc = XMLConverter.newDOM();
        Element result = GSXML.createBasicResponse(result_doc, RECORD_USER_ACTION);

        Element paramList = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
        if (paramList == null)
        {
            GSXML.addError(result, "Request has no parameter list");
            return result;
        }

        HashMap<String, Serializable> params = GSXML.extractParams(paramList, true);
        String username = (String) params.get(USER_PARAM);
        String collection = (String) params.get(COLLECTION_PARAM);
        String site = (String) params.get(SITE_PARAM);
        String oid = (String) params.get(OID_PARAM);
        String action = (String) params.get(ACTION_PARAM);

        DerbyWrapper database = new DerbyWrapper(DerbyWrapper.USERSDB_DIR);
        database.addUserAction(username, site, collection, oid, action);
        database.closeDatabase();

        return result;
    }

    protected synchronized Element processGetActivityOnPage(Element request)
    {
      Document result_doc = XMLConverter.newDOM();
        Element result = GSXML.createBasicResponse(result_doc, GET_ACTIVITY_ON_PAGE);
        try
        {

            Element paramList = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
            if (paramList == null)
            {
                GSXML.addError(result, "Request has no parameter list");
                return result;
            }

            HashMap<String, Serializable> params = GSXML.extractParams(paramList, true);
            String collection = (String) params.get(COLLECTION_PARAM);
            String site = (String) params.get(SITE_PARAM);
            String oid = (String) params.get(OID_PARAM);

            DerbyWrapper database = new DerbyWrapper(DerbyWrapper.USERSDB_DIR);
            ArrayList<HashMap<String, String>> userActions = database.getMostRecentUserActions(site, collection, oid);

            Element userList = result_doc.createElement("userList");
            for (HashMap<String, String> userAction : userActions)
            {
                Element user = result_doc.createElement("user");
                user.setAttribute("username", userAction.get("username"));
                user.setAttribute("action", userAction.get("action"));
                userList.appendChild(user);
            }
            result.appendChild(userList);
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
        return result;
    }
}