Java tutorial
/* * Copyright (C) 2005-2006, <a href="http://www.ssel.caltech.edu">SSEL</a> * <a href="http://www.cassel.ucla.edu">CASSEL</a>, Caltech/UCLA * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. * * Project Authors: Raj Advani, Walter M. Yuan, and Peter Bossaerts * Email: jmarkets@ssel.caltech.edu */ /* * EditSessionConfigServlet.java * * Created on July 27, 2004, 2:49 PM */ package edu.caltechUcla.sselCassel.projects.jMarkets.frontdesk.web.actions; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.validator.*; import java.io.*; import org.apache.struts.upload.*; import com.thoughtworks.xstream.XStream; import edu.caltechUcla.sselCassel.projects.jMarkets.frontdesk.web.data.*; import org.apache.struts.action.ActionMessage; import org.apache.struts.action.ActionMessages; /** * @author Walter M. Yuan * @version $Revision: 1.2 $ $Date: 2005-10-29 10:49:12 -0700 (Sat, 29 Oct 2005) $ */ public final class SaveSessionConfigAction extends JMarketsAction { // ----------------------------------------------------- Instance Variables /** * The <code>Log</code> instance for this application. */ private static Log log = LogFactory.getLog(SaveSessionConfigAction.class); // --------------------------------------------------------- Public Methods /** * Process the specified HTTP request, and create the corresponding HTTP * response (or forward to another web component that will create it). * Return an <code>ActionForward</code> instance describing where and how * control should be forwarded, or <code>null</code> if the response has * already been completed. * * @param mapping The ActionMapping used to select this instance * @param actionForm The optional ActionForm bean for this request (if any) * @param request The HTTP request we are processing * @param response The HTTP response we are creating * * @exception Exception if the application business logic throws * an exception */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { // Extract attributes and parameters we will need HttpSession session = request.getSession(); DynaValidatorForm sessionForm = (DynaValidatorForm) form; // Validate the transactional control token ActionMessages errors = new ActionMessages(); isTokenValid(request, log.isDebugEnabled()); resetToken(request); if (!isExperimenter(session)) return (mapping.findForward("login_fail")); // Report any errors we have discovered back to the original form if (!errors.isEmpty()) { saveErrors(request, errors); saveToken(request); return (mapping.getInputForward()); } SessionBean sessionBean = createSessionBean(session, sessionForm); if (sessionBean == null) { ActionMessages aerrors = new ActionMessages(); aerrors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("error.session.file")); saveErrors(request, aerrors); // Remove the obsolete form bean if (mapping.getAttribute() != null) { if ("request".equals(mapping.getScope())) request.removeAttribute(mapping.getAttribute()); else session.removeAttribute(mapping.getAttribute()); } return (mapping.findForward("failure")); } session.setAttribute("sessionBean", sessionBean); // Remove the obsolete form bean if (mapping.getAttribute() != null) { if ("request".equals(mapping.getScope())) request.removeAttribute(mapping.getAttribute()); else session.removeAttribute(mapping.getAttribute()); } return (mapping.findForward("success")); } /** Given the DynaValidator sessionForm, create the SessionBean object. This occurs in one * of two ways: either by parsing an uploaded SessionBean file, or by creating a new * SessionBean from scratch (if no file was uploaded) */ private SessionBean createSessionBean(HttpSession session, DynaValidatorForm sessionForm) { try { boolean loadFromFile = ((Boolean) sessionForm.get("loadFromFile")).booleanValue(); if (!loadFromFile) { SessionBean sessionBean = new SessionBean(); sessionBean.setTimeoutLength(((Integer) sessionForm.get("timeoutLength")).intValue()); sessionBean.setNumSubjects(((Integer) sessionForm.get("numSubjects")).intValue()); sessionBean.setNumGroups(((Integer) sessionForm.get("numGroups")).intValue()); sessionBean.setName((String) sessionForm.get("name")); sessionBean.setShowPastOrders(((Boolean) sessionForm.get("showPastOrders")).booleanValue()); sessionBean.setShowPastTransactions( ((Boolean) sessionForm.get("showPastTransactions")).booleanValue()); sessionBean.setManualAdvance(((Boolean) sessionForm.get("manualAdvance")).booleanValue()); session.setAttribute("numPeriods", sessionForm.get("numPeriods")); return sessionBean; } else { FormFile sessionFile = (FormFile) sessionForm.get("sessionFile"); XStream xstream = new XStream(); xstream.alias("session", SessionBean.class); xstream.alias("periodDef", PeriodBean.class); xstream.alias("groupDef", GroupBean.class); xstream.alias("periodGroup", GroupPeriodBean.class); xstream.alias("payoffDef", PayoffBean.class); xstream.alias("bankruptcyDef", BankruptcyBean.class); xstream.alias("bankruptcyFunction", BankruptcyFunctionBean.class); xstream.alias("bankruptcySecurity", BankruptcySecurityBean.class); xstream.alias("payoffFunction", PayoffFunctionBean.class); xstream.alias("payoffSecurity", PayoffSecurityBean.class); xstream.alias("periodSecurity", SecurityPeriodBean.class); xstream.alias("periodSubject", SubjectPeriodBean.class); InputStream inStream = sessionFile.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(inStream)); String xml = ""; while (true) { String line = reader.readLine(); if (line == null) break; xml += line; } log.info("Received session xml definition"); SessionBean sessionBean = (SessionBean) xstream.fromXML(xml); int numPeriods = sessionBean.getPeriods().size(); session.setAttribute("numPeriods", new Integer(numPeriods)); reader.close(); inStream.close(); return sessionBean; } } catch (Exception e) { log.error("Error reading a session file", e); } return null; } }