Hi Rahul ,
Thanks for such a quick reply:
1. Yeah I had come code to print context in constructor but actually I am
testing it in reset() method of StopClock before which I had set the
constructor. But alas then also I am not able to get the context Please help
.
2. About the second thing I am not much clear , What I understand is thar
you dont want me to use StopClock ( extending AbstractStateMachine ) . I
dont understand the reason .
What I want that when a event is fired , I want to do some functionality ,
Which I can do via extending AbstractStateMachine , Is my understanding
wrong .
Please help clarifying the above .
Thanks for your time .
Thanks & Regards
Saurabh
On Sun, Feb 8, 2009 at 11:01 PM, Rahul Akolkar <rahul.akol...@gmail.com>wrote:
> On Sun, Feb 8, 2009 at 11:56 AM, Saurabh Agarwal <sagarwal1...@gmail.com>
> wrote:
> > Hi All ,
> >
> > I need your help in getting the Context in my Custom Action Class.
> >
> > Here is the scenario:
> > 1. I have a SIP Servlet (MainPOCAS) , In the servlet I am parsing a SCXML
> > file and making a SCXML object out of that file .
> > Then I make the Context ( tried SImpleContext , JexlContext ) and
> set
> > it using
> > StopClock clock=new StopClock(scxml);
> <snip/>
>
> At a quick glance it seems you are trying to retrieve the values in
> the context in the constructor above, but these are set in the line
> below.
>
> There are several other, more important things that jump out. I'm
> afraid I don't have much time ATM (you can take a deeper dive into the
> guide on the website), but the higher order bit is that it isn't
> necessary to create a AbstractStateMachine subclass and also
> instantiate SCXMLExecutor instances -- they are mutually exclusive
> patterns. The AbstractStateMachine class is meant for simple or
> introductory usecases, follows a specific usage pattern and doesn't
> require much knowledge of the Commons SCXML API. I wouldn't use it for
> any kind of SIP integration.
>
> -Rahul
>
>
> > clock.getEngine().setRootContext((Context) jc);
> > If I try retrieving the Context variable in the same class I can vey well
> > retrieve it .
> >
> > 2. But when I try to retrieve the contest i my StateMachine Class , I get
> > the value NULL , I am not able to understand why .
> >
> > What i think is that since I had set the root context of the scxml object
> I
> > should be able to retrieve the context .
> >
> > Please let me know if there is any gap in my understanding .
> >
> > I am attaching the source code ( copy pasted from various examples from
> > commons-scxml site )
> > MainPocAS ( SipServlet ) , StopClock.java ( StateMachine Class)
> Hello.java
> > ( Custom Action class ).
> >
> >
> > /*
> > * To change this template, choose Tools | Templates
> > * and open the template in the editor.
> > */
> >
> > package PocAS;
> > import java.io.IOException;
> > import java.util.Map;
> > import java.util.Set;
> > import java.util.logging.Level;
> > import java.util.logging.Logger;
> > import javax.servlet.Servlet;
> > import javax.servlet.ServletException;
> > import javax.servlet.sip.Proxy;
> > import javax.servlet.sip.SipErrorEvent;
> > import javax.servlet.sip.SipErrorListener;
> > import javax.servlet.sip.SipServlet;
> > import javax.servlet.sip.SipServletRequest;
> > import javax.servlet.sip.SipServletResponse;
> >
> > import java.io.IOException;
> > import java.net.URL;
> > import java.util.AbstractMap;
> > import java.util.ArrayList;
> > import java.util.HashMap;
> > import java.util.List;
> > import org.apache.commons.jexl.JexlContext;
> > import org.apache.commons.jexl.JexlHelper;
> > import org.apache.commons.scxml.Context;
> > import org.apache.commons.scxml.PathResolver;
> > import org.apache.commons.scxml.SCXMLExecutor;
> > import org.apache.commons.scxml.env.SimpleContext;
> > import org.apache.commons.scxml.env.SimpleErrorHandler;
> > import org.apache.commons.scxml.env.servlet.ServletContextResolver;
> > import org.apache.commons.scxml.io.SCXMLParser;
> > import org.apache.commons.scxml.model.CustomAction;
> > import org.apache.commons.scxml.model.Event;
> > import org.apache.commons.scxml.model.ModelException;
> > import org.apache.commons.scxml.model.SCXML;
> > import org.xml.sax.ErrorHandler;
> > import org.xml.sax.SAXException;
> > import org.xml.sax.ext.DefaultHandler2;
> > import org.xml.sax.helpers.DefaultHandler;
> >
> >
> >
> > /**
> > *
> > * @author sauragar
> > */
> > @javax.servlet.sip.annotation.SipServlet
> > public class MainPocAS extends javax.servlet.sip.SipServlet implements
> > SipErrorListener,Servlet {
> >
> >
> > private static final long serialVersionUID = 3978425801979081269L;
> > //Reference to context - The ctx Map is used as a central storage for
> > this app
> > javax.servlet.ServletContext ctx = null;
> >
> > protected void doInvite(SipServletRequest request)
> > throws ServletException, IOException {
> >
> >
> >
> > log(" $$$ ############################ SimpleProxyServlet: Got
> > request:\n" + request+" TO::"+request.getTo());
> > log (" New log To::"+request.getTo().toString());
> > HashMap aMap=new HashMap() ;
> > aMap.put("SipMessage","Saurabh" );
> > SimpleContext sc=new SimpleContext(aMap);
> > JexlContext jc = JexlHelper.createContext();
> >
> >
> > jc.setVars(aMap);
> >
> > // (1) Create a list of custom actions, add as many as are needed
> > List customActions = new ArrayList();
> > CustomAction ca =
> > new CustomAction("http://my.custom-actions.domain/CUSTOM1";,
> > "hello", Hello.class);
> > CustomAction ca1 =
> > new CustomAction("http://my.custom-actions.domain/CUSTOM2";,
> > "bar", Hello.class);
> > customActions.add(ca);
> > customActions.add(ca1);
> > // (2) Parse the SCXML document containing the custom action(s)
> > SCXML scxml = null;
> > try {
> > // try {URL url=new URL
> > (StopClock.class.getClassLoader().getResource("PocAS/stopwatch.xml"));
> > scxml =
> >
> SCXMLParser.parse(StopClock.class.getClassLoader().getResource("PocAS/stopwatch.xml"),
> > new SimpleErrorHandler(), customActions);
> >
> > // Also see other methods in SCXMLParser API
> > // "url" points to SCXML document
> > // "errorHandler" is SAX ErrorHandler
> > } catch (SAXException ex) {
> > Logger.getLogger(MainPocAS.class.getName()).log(Level.SEVERE,
> > null, ex);
> > } catch (ModelException ex) {
> > Logger.getLogger(MainPocAS.class.getName()).log(Level.SEVERE,
> > null, ex);
> > }
> > // Also see other methods in SCXMLParser API
> > // "url" points to SCXML document
> > // "errorHandler" is SAX ErrorHandler
> >
> > StopClock clock=new StopClock(scxml);
> >
> > clock.getEngine().setRootContext((Context) jc);
> >
> >
> > Context RCtx= clock.getEngine().getRootContext();
> >
> > System.out.println(" In Main Root Context ::"+ RCtx.toString());
> > System.out.println(" In Main Root Context Msg ::"+
> > RCtx.get("SipMessage"));
> > System.out.println(" In Main Root Context ::"+ RCtx.getVars());
> > // if(request.getTo().toString().equals("Alice1"))
> > clock.fireEvent(StopClock.EVENT_RESET);
> > // else
> > // clock.fireEvent(StopClock.EVENT_STOP);
> > /*SCXML scxml = null;
> >
> > try {
> > try {
> >
> > scxml = SCXMLParser.parse(new URL("
> >
> http://svn.apache.org/repos/asf/commons/proper/scxml/trunk/src/test/java/org/apache/commons/scxml/env/stopwatch.xml
> "),
> > new DefaultHandler2());
> > log("SimpleProxyServlet: Children::"+scxml.getChildren());
> > } catch (ModelException ex) {
> >
> > Logger.getLogger(MainPocAS.class.getName()).log(Level.SEVERE, null, ex);
> > }
> > } catch (IOException ioe) {
> > log("SimpleProxyServlet: err"+ioe.getMessage());
> > // IOException while parsing
> > } catch (SAXException se) {
> > // SAXException while parsing
> > log("SimpleProxyServlet: ERR::"+se.getMessage());
> > }
> >
> >
> >
> > if (scxml == null) {
> > log("SimpleProxyServlet: Parsing Failed::");
> > }
> >
> >
> > SCXMLExecutor exec = null;
> > try {
> > exec = new SCXMLExecutor();
> > exec.setStateMachine(scxml);
> >
> > //exec.addListener(scxml, <SCXMLListener>);
> > //exec.setRootContext(<Context>);
> > log("SimpleProxyServlet: Going to start the state machine");
> > exec.go();
> >
> > } catch (ModelException me) {
> > // Executor initialization failed, because the
> > // state machine specified has inconsistencies
> > }*/
> >
> >
> > /*if (request.isInitial()) {
> >
> > Proxy proxy = request.getProxy();
> > proxy.setRecordRoute(true);
> > proxy.setSupervised(true);
> > proxy.proxyTo(request.getRequestURI()); // bobs uri
> >
> > }*/
> >
> > System.out.println("SimpleProxyServlet: Got request:\n" +
> request);
> > }
> >
> >
> > protected void doBye(SipServletRequest request) throws
> ServletException,
> > IOException {
> >
> > System.out.println("SimpleProxyServlet: Got BYE request:\n" +
> > request);
> > super.doBye(request);
> > }
> >
> >
> > protected void doResponse(SipServletResponse response)
> > throws ServletException, IOException {
> >
> > System.out.println("SimpleProxyServlet: Got response:\n" +
> > response);
> > super.doResponse(response);
> > }
> >
> >
> > // SipErrorListener
> >
> > public void noAckReceived(SipErrorEvent ee) {
> >
> > System.out.println("SimpleProxyServlet: Error: noAckReceived.");
> > }
> >
> > public void noPrackReceived(SipErrorEvent ee) {
> >
> > System.out.println("SimpleProxyServlet: Error: noPrackReceived.");
> > }
> >
> > @Override
> > public void init(javax.servlet.ServletConfig config) throws
> > javax.servlet.ServletException {
> > super.init(config);
> > ctx = config.getServletContext();
> > }
> > }
> >
> >
> >
> >
> >
> >
> >
> > /*
> > * To change this template, choose Tools | Templates
> > * and open the template in the editor.
> > */
> >
> > package PocAS;
> > import java.net.MalformedURLException;
> > import java.net.URL;
> > import java.util.Set;
> > import java.util.Timer;
> > import java.util.TimerTask;
> > import java.util.logging.Level;
> > import java.util.logging.Logger;
> >
> >
> > import javax.servlet.sip.SipServlet;
> > import org.apache.commons.jexl.JexlContext;
> > import org.apache.commons.scxml.Context;
> > import org.apache.commons.scxml.env.AbstractStateMachine;
> > import org.apache.commons.scxml.model.SCXML;
> >
> > /**
> > 26 * A SCXML document driven stop watch.
> > 27 *
> > 28 * Using SCXML makes the StopWatch class simplistic; you are neither
> > 29 * managing the stopwatch "lifecycle" nor coding any "transitions",
> > 30 * that information is pulled in straight from the behavioral model
> > * of the stop watch, which is encapsulated in the SCXML document
> > * the constructor points to (which in turn may be generated straight
> > * from the UML model).
> > */
> > public class StopClock extends AbstractStateMachine {
> >
> > /** The events for the stop watch. */
> > public static final String EVENT_START = "watch.start",
> > EVENT_STOP = "watch.stop", EVENT_SPLIT = "watch.split",
> > EVENT_UNSPLIT = "watch.unsplit", EVENT_RESET = "watch.reset";
> >
> > /** The fragments of the elapsed time. */
> > private int hr, min, sec, fract;
> > /** The fragments of the display time. */
> > private int dhr, dmin, dsec, dfract;
> > /** The stopwatch "split" (display freeze). */
> > private boolean split;
> > /** The Timer to keep time. */
> > private Timer timer;
> > /** The display decorations. */
> > private static final String DELIM = ":", DOT = ".", EMPTY = "", ZERO
> =
> > "0";
> >
> > public StopClock(SCXML scxml) throws MalformedURLException {
> > // super(StopClock.class.getClassLoader().
> > // getResource("PocAS/stopwatch.xml"));
> > // super(new URL ("
> >
> http://svn.apache.org/repos/asf/commons/proper/scxml/trunk/src/test/java/org/apache/commons/scxml/env/stopwatch.xml
> > "));
> > super(scxml);
> > System.out.println("### $$$$$$$$ CONTEXT
> > "+this.getEngine().getRootContext().toString());
> > System.out.println("### Context
> > Val::"+this.getEngine().getRootContext().get("SipMessage"));
> > //javax.servlet.sip.SipServlet ss=(SipServlet)
> > this.getEngine().getRootContext().get("SipMessage");
> >
> > //log("$$$$$$$$ CONTEXT
> > "+this.getEngine().getRootContext().toString());
> >
> > }
> >
> > // Each method below is the activity corresponding to a state in the
> > // SCXML document (see class constructor for pointer to the
> document).
> > public void reset() {
> > System.out.println(" In constructor of stop clock ");
> > System.out.println("RESET ### $$$$$$$$ CONTEXT
> > "+this.getEngine().getRootContext().toString());
> > System.out.println("RESET VARS
> > ::"+this.getEngine().getRootContext().getVars());
> > System.out.println("RESET ### Context
> > Val::"+this.getEngine().getRootContext().get("SipMessage"));
> >
> > JexlContext ctx=(JexlContext)
> > this.getEngine().getRootContext();
> >
> > System.out.println("RESET ### JEXL Context
> > ::"+ctx.getVars());
> >
> >
> > //javax.servlet.sip.SipServlet ss=(SipServlet)
> > this.getEngine().getRootContext().get("SipMessage");
> >
> >
> > hr = min = sec = fract = dhr = dmin = dsec = dfract = 0;
> > split = false;
> > }
> >
> > public void running() {
> > System.out.println (" Running");
> > split = false;
> > if (timer == null) {
> > timer = new Timer(true);
> > timer.scheduleAtFixedRate(new TimerTask() {
> > public void run() {
> > increment();
> > }
> > }, 100, 100);
> > }
> > }
> >
> > public void paused() {
> > split = true;
> > }
> >
> > public void stopped() {
> > timer.cancel();
> > timer = null;
> > }
> >
> > public String getDisplay() {
> > String padhr = dhr > 9 ? EMPTY : ZERO;
> > String padmin = dmin > 9 ? EMPTY : ZERO;
> > String padsec = dsec > 9 ? EMPTY : ZERO;
> > return new
> StringBuffer().append(padhr).append(dhr).append(DELIM).
> > append(padmin).append(dmin).append(DELIM).append(padsec).
> > append(dsec).append(DOT).append(dfract).toString();
> > }
> >
> > // used by the demonstration (see StopWatchDisplay usecase)
> > public String getCurrentState() {
> > Set states = getEngine().getCurrentStatus().getStates();
> > return ((org.apache.commons.scxml.model.State) states.iterator().
> > next()).getId();
> > }
> >
> > private void increment() {
> > if (fract < 9) {
> > fract++;
> > } else {
> > fract = 0;
> > if (sec < 59) {
> > sec++;
> > } else {
> > sec = 0;
> > if (min < 59) {
> > min++;
> > } else {
> > min = 0;
> > if (hr < 99) {
> > hr++;
> > } else {
> > hr = 0; //wrap
> > }
> > }
> > }
> > }
> > if (!split) {
> > dhr = hr;
> > dmin = min;
> > dsec = sec;
> > dfract = fract;
> > }
> > }
> >
> > }
> >
> >
> >
> >
> >
> >
> >
> >
> > /*
> > * To change this template, choose Tools | Templates
> > * and open the template in the editor.
> > */
> >
> > package PocAS;
> > import java.util.Collection;
> >
> > import java.util.List;
> > import org.apache.commons.logging.Log;
> > import org.apache.commons.scxml.ErrorReporter;
> > import org.apache.commons.scxml.EventDispatcher;
> > import org.apache.commons.scxml.SCInstance;
> > import org.apache.commons.scxml.SCXMLExpressionException;
> > import org.apache.commons.scxml.TriggerEvent;
> > import org.apache.commons.scxml.model.Action;
> > import org.apache.commons.scxml.model.ExternalContent;
> > import org.apache.commons.scxml.model.ModelException;
> >
> > /**
> > * Our custom "hello world" action.
> > */
> > public class Hello extends Action {
> >
> > /** Serial version UID. */
> > private static final long serialVersionUID = 1L;
> > /** This is who we say hello to. */
> > private String name;
> > /** We count callbacks to execute() as part of the test suite. */
> > public static int callbacks = 0;
> >
> > /** Public constructor is needed for the I in SCXML IO. */
> > public Hello() {
> > super();
> > System.out.println("Hello: Got in Hello constructor...");
> > }
> >
> > /**
> > * Get the name.
> > *
> > * @return Returns the name.
> > */
> > public String getName() {
> > System.out.println("Hello: getName");
> > return name;
> > }
> >
> > /**
> > * Set the name.
> > *
> > * @param name The name to set.
> > */
> > public void setName(String name) {
> > this.name = name;
> > System.out.println("Hello: setName");
> > }
> >
> > /**
> > * @inheritDoc
> > */
> > public void execute(final EventDispatcher evtDispatcher,
> > final ErrorReporter errRep, final SCInstance scInstance,
> > final Log appLog, final Collection derivedEvents)
> > throws ModelException, SCXMLExpressionException {
> >
> > System.out.println("Hello: execute");
> > if (appLog.isInfoEnabled()) {
> > appLog.info("Hello " + name);
> > }
> > // For derived events payload testing
> > TriggerEvent event =
> > new TriggerEvent("helloevent", TriggerEvent.TIME_EVENT,
> name);
> > derivedEvents.add(event);
> > callbacks++;
> > }
> >
> >
> > }
> >
> >
> >
> >
> > Please try to help me .
> >
> > Thanks & Regards
> > Saurabh
> >
> >
> >
> >
> > --
> >
> > "Successful people make more mistakes because they do more "
> > Thanks
> > Saurabh Agarwal
> >
>
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>
--
"Successful people make more mistakes because they do more "
Thanks
Saurabh Agarwal
