StateMachine.java |
/* * 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 imports import 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; } }
StateMachine.java |