>>> [EMAIL PROTECTED] 01/10/06 05:35AM >>>
Hello, I am starting to study the use of Commons scxml and I would like
to know how I can install and use it.
Thanks
This a very, very small of amount of sample code that uses SCXML
The application needs to update objects/classes in a certain seqeunce
I "attach" a listener for a particular state. With the State engine the
objects/classes
are updated in the desired seqeunce
CODE (look for the other text CODE)
This is wrapper class for SCXML
Constructor for this class
public SCXMLEngines(Configuration lconfig,String pathtoConfig)
{
Configuration comes from jconfig
pathtoConfig points is a category in a jconfig application config file
<category name="SCXML">
<category name="GIS">
<filename>${Project_Directory}\SCXML-Gis.xml</filename>
<Events>evGISUpdate1,evGISUpdate2,evGISUpdate3,evGISUpdate4,evGISUpdate5,evGISUpdate6,evGISUpdate7,evGISUpdate8,evGISUpdate9,evGISUpdate10,evGISUpdate11,evGISUpdate12</Events>
</category>
</category>
the file SCXML-Gis is below this class
package codetable;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Locale;
import java.util.Map;
import org.apache.commons.scxml.Context;
import org.apache.commons.scxml.Evaluator;
import org.apache.commons.scxml.EventDispatcher;
import org.apache.commons.scxml.SCXMLDigester;
import org.apache.commons.scxml.SCXMLExecutor;
import org.apache.commons.scxml.SCXMLListener;
import org.apache.commons.scxml.TriggerEvent;
import org.apache.commons.scxml.env.SimpleDispatcher;
import org.apache.commons.scxml.env.Tracer;
import org.apache.commons.scxml.env.jsp.ELEvaluator;
import org.apache.commons.scxml.model.ModelException;
import org.apache.commons.scxml.model.SCXML;
import org.apache.commons.scxml.model.State;
import org.apache.log4j.Logger;
import org.jconfig.Configuration;
public class SCXMLEngines {
private final transient Configuration lconfig;
static final Logger logger =
Logger.getLogger(SCXMLEngines.class);
private transient String uri=null;
private transient SCXML doc=null;
private transient SCXMLExecutor exec=null;
private transient String triggers[]=null;
private static Locale bLocale = new Locale("en", "US");
private transient String pathtoConfig = null;
private transient Evaluator engine=null;
private transient Context rootCtx=null;
private transient EventDispatcher dispatcher=null;
private transient Tracer trc=null;
/* States used for updating J Drew map numbers update panels
public static String AllState ="AllStates";
public static String stGISUpdate ="stGISUpdate";
public static String stUpdateMatrix ="stUpdateMatrix";
public static String stUpdateImportPanel
="stUpdateImportPanel";
D public static String stUpdateEditAbTable
="stUpdateEditAbTable";
public static String stUpdateEditJTable ="stUpdateEditJTable";
D public static String stUpdateEditPanel ="stUpdateEditPanel";
public static String stUpdateLocationMapHandler
="stUpdateLocationMapHandler";
public static String stUpdateLocationMapLayer
="stUpdateLocationMapLayer";
public static String stUpdateShapeMapHandler
="stUpdateShapeMapHandler";
public static String stUpdateShapeMapLayer
="stUpdateShapeMapLayer";
D public static String stUpdateMapPanel ="stUpdateMapPanel";
public static String stGISFinished ="stGISFinished";
public static String stFinal ="stFinal";
*/
public SCXMLEngines(Configuration lconfig,String pathtoConfig)
{
super();
this.lconfig = lconfig;
this.pathtoConfig = pathtoConfig;
try {
uri =
this.getCanonicalURI(this.lconfig.getProperty("filename","None",this.pathtoConfig));
triggers = this.lconfig.getArray("Events",
new
String[]{"No","No","No","No","No","No","No","No","No","No","No","No"},
this.pathtoConfig);
engine = new ELEvaluator();
rootCtx = engine.newContext(null);
dispatcher = new SimpleDispatcher();
trc = new Tracer();
doc = SCXMLDigester.digest(new URL(uri),
trc,
rootCtx,
engine);
if (doc == null) {
logger.info("The SCXML document " + uri
+
" can not be parsed!");
System.exit(-1);
}
logger.info(SCXMLDigester.serializeSCXML(doc));
exec = new SCXMLExecutor(engine, dispatcher,
trc);
doc.addListener(trc);
exec.setSuperStep(true);
exec.setStateMachine(doc);
} catch (IOException e) {
final EtoLogger etologger = (EtoLogger)
CodeTable.appContainer.getInstanceOfType( EtoLogger.class );
etologger.captureTrace(logger, e);
} catch (ModelException e) {
final EtoLogger etologger = (EtoLogger)
CodeTable.appContainer.getInstanceOfType( EtoLogger.class );
etologger.captureTrace(logger, e);
}
logger.info(uri.toString()+" "+triggers);
}
public SCXML getDoc() {
return doc;
}
public Map getStates(){
return doc.getStates();
}
public void addListener(final SCXMLListener listener, final
String statename) {
final Map states = this.getStates();
final State state = (State)states.get(statename);
state.addListener(listener);
}
public void removeListener(final SCXMLListener listener, final
String statename) {
final Map states = this.getStates();
final State state = (State)states.get(statename);
state.removeListener(listener);
}
public SCXMLExecutor getExec() {
return exec;
}
public void execGISStates(){
try {
for(int i=0; i<triggers.length; ++i){
TriggerEvent[] evts = {new
TriggerEvent(triggers[i], TriggerEvent.SIGNAL_EVENT, null)};
exec.triggerEvents(evts);
}
} catch (ModelException e) {
final EtoLogger etologger = (EtoLogger)
CodeTable.appContainer.getInstanceOfType( EtoLogger.class );
etologger.captureTrace(logger, e);
}
}
/***
* @param uri an absolute or relative URL
* @return java.lang.String canonical URL (absolute)
* @throws java.io.IOException if a relative URL can not be
resolved
* to a local file
*/
private String getCanonicalURI(final String uri)
throws IOException {
if (uri.toLowerCase(bLocale).startsWith("http://";)
|| uri.toLowerCase(bLocale).startsWith("file://")) {
return uri;
}
final File inFile = new File(uri);
return "file:///" + inFile.getCanonicalPath();
}
}
CODE
State Transition File SCXML-Gis
<?xml version="1.0"?>
<scxml xmlns="http://www.w3.org/2005/01/SCXML";
version="1.0"
initialstate="AllStates">
<state id="AllStates">
<transition event="evGISUpdate1">
<target next="stGISUpdate"/>
</transition>
</state>
<state id="stGISUpdate">
<transition event="evGISUpdate2">
<target next="stUpdateMatrix"/>
</transition>
</state>
<state id="stUpdateMatrix">
<transition event="evGISUpdate3">
<target next="stUpdateImportPanel"/>
</transition>
</state>
<state id="stUpdateImportPanel">
<transition event="evGISUpdate4">
<target next="stUpdateEditAbTable"/>
</transition>
</state>
<state id="stUpdateEditAbTable">
<transition event="evGISUpdate5">
<target next="stUpdateEditJTable"/>
</transition>
</state>
<state id="stUpdateEditJTable">
<transition event="evGISUpdate6">
<target next="stUpdateEditPanel"/>
</transition>
</state>
<state id="stUpdateEditPanel">
<transition event="evGISUpdate7">
<target next="stUpdateLocationMapHandler"/>
</transition>
</state>
<state id="stUpdateLocationMapHandler">
<transition event="evGISUpdate8">
<target next="stUpdateLocationMapLayer"/>
</transition>
</state>
<state id="stUpdateLocationMapLayer">
<transition event="evGISUpdate9">
<target next="stUpdateShapeMapHandler"/>
</transition>
</state>
<state id="stUpdateShapeMapHandler">
<transition event="evGISUpdate10">
<target next="stUpdateShapeMapLayer"/>
</transition>
</state>
<state id="stUpdateShapeMapLayer">
<transition event="evGISUpdate11">
<target next="stUpdateMapPanel"/>
</transition>
</state>
<state id="stUpdateMapPanel">
<transition event="evGISUpdate12">
<target next="stGISFinished"/>
</transition>
</state>
<state id="stGISFinished">
<transition event="evGISUpdate13">
<target next="stFinal"/>
</transition>
</state>
<state id="stFinal" final="true"/>
</scxml>
CODE
this is how I create/store references to this class using YAN(IOC
Container)
GISDisplayContainer.registerValue("lconfig",
lconfig);
ITextMapper places = new PlacetoRowMap(lDAO);
ITextMapper interests = new
InteresttoColumnMap();
GISDisplayContainer.registerValue("places",
places);
GISDisplayContainer.registerValue("interests",
interests);
GISDisplayContainer.registerComponent(Components.ctor(SCXMLEngines.class)
.withArgument(1,Components.value("SCXML/GIS")));
GISDisplayContainer.registerComponent(Components.ctor(GIS_Data_Mediator.class)
.withArgument(3,
Components.useKey("places"))
.withArgument(4,
Components.useKey("interests"))
.singleton().label("GIS
Data Mediator")
);
CODE
Constructor within GIS_Data_Mediator
public GIS_Data_Mediator(Configuration lconfig,
DAO
pvDAO,
SCXMLEngines
stateEngine,
ITextMapper
placeMap,
ITextMapper
interestMap) {
super();
this.lconfig = lconfig;
this.pDAO = pvDAO;
this.stateEngine = stateEngine;
this.placeMap = placeMap;
this.interestMap = interestMap;
}
CODE
Code within GIS_Data_Mediator that attaches listeners to the state
Engine
stateEngine.addListener(gPanel, "stUpdateEditPanel");
stateEngine.addListener(gTable, "stUpdateEditAbTable");
CODE
Code used by GIS_Data_Grid_JPanel.
public class GIS_Data_Grid_JPanel extends JPanel implements
SCXMLListener{
public void onEntry(TransitionTarget arg0) {
logger.info("Started by SCML in grid jpanel");
}
public void onExit(TransitionTarget arg0) {
}
public void onTransition(TransitionTarget arg0, TransitionTarget
arg1, Transition arg2) {
}
CODE
Part of build.xml with references to the files required by SCXML
<pathelement
location="D:/Commons-Scxml/apache-tomcat-5.5.12-embed/lib/servlets-default.jar"/>
<pathelement
location="D:/Commons-Scxml/apache-tomcat-5.5.12-embed/lib/jsp-api.jar"/>
<pathelement
location="D:/Commons-Scxml/apache-tomcat-5.5.12-embed/lib/servlet-api.jar"/>
<pathelement
location="D:/Commons-Scxml/commons-scxml-1.0-SNAPSHOT.jar"/>
<pathelement
location="D:/commons-digester-1.7/commons-digester-1.7.jar"/>
<pathelement
location="D:/commons-beanutils-1.7.0/commons-beanutils-core.jar"/>
<pathelement
location="D:/commons-beanutils-1.7.0/commons-beanutils.jar"/>
<pathelement
location="D:/commons-beanutils-1.7.0/commons-beanutils-bean-collections.jar"/>
<pathelement location="D:/commons-el-1.0/commons-el.jar"/>
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
