/* * Copyright 2002 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright *   notice, this list of conditions and the following disclaimer. * * - Redistribution 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. * * Neither the name of Sun Microsystems, Inc. or the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * This software is provided "AS IS," without a warranty of any * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that Software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of * any nuclear facility. */package com.sun.j2ee.blueprints.waf.controller.ejb;import java.rmi.RemoteException;import javax.naming.InitialContext;import javax.naming.NamingException;import javax.ejb.SessionContext;import java.util.Collection;import java.util.HashMap;// waf importsimport com.sun.j2ee.blueprints.waf.controller.ejb.action.EJBAction;import com.sun.j2ee.blueprints.util.tracer.Debug;import com.sun.j2ee.blueprints.waf.event.EventException;import com.sun.j2ee.blueprints.waf.event.EventResponse;import com.sun.j2ee.blueprints.waf.event.Event;/** * This class is a responsible for processing Events recieved from the * client tier. Af part of the WAF framework the events are generated * by web actions. * * The State Machine ties all EJB components together dynamically at * runtime thus providing support for reusable components. * * This class should not be updated to handle various event types. * This class will use ActionHandlers to handle events that require * processing beyond the scope of this class. * * The mapping of the event names to handlers is mangaged by the JNDI * key contained in the Event:getEventName() which is looked up from * an environment entry located in the EJB Deployment descriptor of the * EJBClientController. A second option to event handling is to do so * in the XML file. * * State may be stored in the attributeMap * * */public class StateMachine implements java.io.Serializable {    private EJBControllerLocalEJB ccejb;    private HashMap attributeMap;    private HashMap actionMap;    private SessionContext sc;    public StateMachine(EJBControllerLocalEJB ccejb, SessionContext sc) {        this.ccejb = ccejb;        this.sc = sc;        attributeMap = new HashMap();        actionMap = new HashMap();    }    public EventResponse processEvent(Event ev) throws EventException {        String actionName = ev.getEJBActionClassName();        EventResponse response = null;        if (actionName  != null) {            EJBAction action = null;            try {                 if (actionMap.get(actionName) != null) {                    action = (EJBAction)actionMap.get(actionName);                 } else {                     action = (EJBAction)Class.forName(actionName).newInstance();                     actionMap.put(actionName, action);             }            } catch (Exception ex) {                System.err.println("StateMachine: error loading " + actionName + " :" + ex);            }            if (action != null) {                action.init(this);                // do the magic                action.doStart();                response = action.perform(ev);                action.doEnd();            }        }        return response;    }    public void setAttribute(String key, Object value) {        attributeMap.put(key, value);    }    public Object getAttribute(String key) {        return attributeMap.get(key);    }    public EJBControllerLocalEJB getEJBController() {        return ccejb;    }    public SessionContext getSessionContext() {        return sc;    }}