4:03 a.m.
Hi again,
I am calling an action and in this action i am fire a Rule from JRules. Based on the
result of this rule i want to use a transition ( token.signal( "xxx" ) ).
But when i do this, i get an Exception. Is it not possible to use use token.signal in an
action? And then, how should i realise actions in which i want to move to a next token? Is
it only Possible with DecicionHandlers?
The Exception:
anonymous wrote :
| org.jbpm.JbpmException: can't continue execution on locked tokens. signalling the
same token that executes an action is not allowed
| at org.jbpm.graph.exe.Token.signal(Token.java:164)
| at org.jbpm.graph.exe.Token.signal(Token.java:137)
|
| </decision>
| <decision name="SGA">
| <event type="node-enter">
| <action name="checkSGA"
class="actions.DefaultRuleAction">
| <ruleFile>etr2.drl</ruleFile>
| <transitionName>t_sga a</transitionName>
| <transitionName_False>t_sga c</transitionName_False>
| </action>
| </event>
| <transition name="t_sga a" to="SGA
A"></transition>
| <transition name="t_sga b" to="SGA
B"></transition>
| <transition name="t_sga c" to="SGA
C"></transition>
| </decision>
| <state name="SGA A">
|
Action:
| public class DefaultRuleAction extends RuleAction {
| private static final long serialVersionUID = 8459834862286126414L;
|
| //Name der Variablen die in der Action beruecksichtigt werden.
| public List objectNames = null;
| public String transitionName = null;
| public String transitionName_False = null;
|
| public void execute( ExecutionContext executionContext) throws Exception {
| // TODO Auto-generated method stub
| System.err.println("My Timer-Rule-Action!");
|
| if (this.ruleFile == null) {
| System.err.println("Es wurde kein Rule-File angegeben.");
| // TODO String aus einer Property laden.
| return;
| }
|
| // load up the RuleBase
| WorkingMemory workingMemory = null;
| try {
| RuleBase ruleBase = readRule(this.ruleFile);
|
| workingMemory = this.generateWorkingMemory( ruleBase );
|
| this.assertObjectsIn( workingMemory, executionContext );
| workingMemory.fireAllRules();
|
| if( RuleAction.getResultFrom( workingMemory ) == true ){
| if(this.transitionName != null){
| executionContext.getToken().signal( transitionName );
| }
| }else{
| if(this.transitionName_False != null){
| executionContext.getToken().signal( transitionName_False );
| }
| }
|
| } catch (FileNotFoundException fnfe) {
| System.err.println("Es wurde ein falsches Rule-File angegeben.");
| fnfe.printStackTrace();
| // TODO String aus einer Property laden.
| } catch (MissingRuleResultException mrre){
| System.err.println("Es wurde kein RuleResult-Object im WorkingMemory der Regel
gefunden.");
| mrre.printStackTrace();
| // TODO String aus einer Property laden.
| } catch (Exception e){
| System.err.println("Rule-Base konnte nicht angelegt werden.");
| e.printStackTrace();
| // TODO String aus einer Property laden.
| } finally{
| if(workingMemory != null)
| workingMemory.dispose();
| }
|
| //ArcaViaController.getInstance().cancelTimer( executionContext.getTimer() );
|
| }
|
|
| public abstract class RuleAction implements ActionHandler{
| /* Name der Variablen des Workflows welche in das WorkingMemory
| der Regel eingepflegt werden sollen.*/
| protected List objectNames = null;
|
| protected String ruleFile = null;
| private RuleResult ruleResult = new RuleResult();
|
| /**
| * Please note that this is the "low level" rule assembly API.
| * @throws Exception
| */
| protected static RuleBase readRule(String ruleFileLocation) throws Exception{
| // ruleFileLocation = "src" +
| // System.getProperty("file.separator") +
| // "rules" +
| // System.getProperty("file.separator") +
| // ruleFileLocation;
|
| System.err.println( ruleFileLocation );
|
| //read in the source
| Reader source = null;
| try{
| source = new InputStreamReader( RuleAction.class.getResourceAsStream(
"/"+ruleFileLocation ) );
| // source = new InputStreamReader( new FileInputStream( new File(ruleFileLocation) )
);
|
| }catch( Exception e ){
| throw new FileNotFoundException();
| }
|
| //optionally read in the DSL (if you are using it).
| //Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream(
"/mylang.dsl" ) );
|
| //Use package builder to build up a rule package.
| //An alternative lower level class called "DrlParser" can also be used...
|
| DrlParser parser = new DrlParser();
| PackageDescr packageDescr = parser.parse( source);
|
| /*
| * Wenn der default PackageBuilder eine Exception erzeugt (was er tat),
| * soll man ihn dann durch diese Code-Zeilen ersetzen laut der JBoss wiki Seite
| */
| PackageBuilderConfiguration pkgBuilderCfg = new PackageBuilderConfiguration();
| pkgBuilderCfg.setCompiler(PackageBuilderConfiguration.JANINO);
| PackageBuilder builder = new PackageBuilder(pkgBuilderCfg);
|
|
| //default PackageBuilder
| //PackageBuilder builder = new PackageBuilder();
|
| //this wil parse and compile in one step
| //NOTE: There are 2 methods here, the one argument one is for normal DRL.
| //builder.addPackageFromDrl( source );
| builder.addPackage(packageDescr);
|
| //Use the following instead of above if you are using a DSL:
| //builder.addPackageFromDrl( source, dsl );
|
| //get the compiled package (which is serializable)
| Package pkg = builder.getPackage();
|
| //add the package to a rulebase (deploy the rule package).
| RuleBase ruleBase = RuleBaseFactory.newRuleBase();
| ruleBase.addPackage( pkg );
| return ruleBase;
| }
|
| /**
| * Lädt aus dem uebergebenen WorkingMemory ein RuleResult-Object und
| * liefert den Result-Wert von diesem Object zurueck.
| * Dieser Result-Wert kann in einer Regel dazu verwendet werden,
| * ein Ergebniss zurueck zu liefern (zur Zeit nur true oder false).
| *
| * @param wm WorkingMemory aus welchem das RuleResult-Object geprueft werden soll.
| * @return Den Result-Wert des RuleResult-Objectes in dem uebergeben WorkingMemory.
| * @throws MissingRuleResultException Es gibt kein RuleResult-Object im uebergebenen
WorkingMemory.
| */
| protected static boolean getResultFrom( WorkingMemory wm ) throws
MissingRuleResultException{
| // if( wm == null )
| // throw new NullPointerException();
|
| List ruleResults = wm.getObjects( RuleResult.class );
|
| if( ruleResults.size() < 1 )
| throw new MissingRuleResultException();
|
| RuleResult rs = (RuleResult)ruleResults.get(0);
| return rs.getResult();
|
| }
|
| /**
| * Lädt das RuleResult Object in den WorkingMemory
| * so das man Ihn später in der Rule verwenden kann und
| * das in Ihm stehende Ergebniss der Regel mit der Methode
| * <code>getResultFrom(WorkingMemory wm)</code> auslesen kann.
| *
| * @param wm WorkingMemory welches mit einem RuleResult Object vorbereitet werden
soll.
| */
| protected void prepareWorkingMemory( WorkingMemory wm ){
| // if( wm == null )
| // throw new NullPointerException();
| wm.assertObject( this.ruleResult );
| }
|
| /**
| * Erzeugt einen neuen WorkingMemory in der uebergebenen RuleBase und
| * ruft fuer diesen dann <code>prepareWorkingMemory( WorkingMemory wm
)</code>
| * auf um den WorkingMemory mit dem RuleResult-Object zu beladen.
| *
| * @param ruleBase RuleBase in welchem das neue WorkingMemory erzeugt werden soll.
| * @return Das Erzeugte WorkingMemory.
| */
| protected WorkingMemory generateWorkingMemory( RuleBase ruleBase){
| WorkingMemory wm = ruleBase.newWorkingMemory();
| this.prepareWorkingMemory( wm );
|
| return wm;
| }
|
| /**
| * Lädt die Variablen des Workflows welche der Action bei Ihrem Aufruf
| * durch den Workflow uebergeben wurden in den WorkingMemory der Regel.
| *
| * @param wm WorkingMemory welcher mit den Objecten beladen werden soll.
| * @param executionContext Context mittels welcher die Variablen enthaelt.
| */
| protected void assertObjectsIn( WorkingMemory wm, ExecutionContext executionContext
){
|
| if (objectNames != null) {
| // Ausgewählte Variablen einladen
| ContextInstance ci = executionContext.getContextInstance();
| Iterator it = objectNames.iterator();
| while (it.hasNext()) {
| String objectName = (String) it.next();
| wm.assertObject(ci.getVariable(objectName));
| }
| }/*
| * Zu gefährlich in der Handhabung daher deaktiviert else{ //
| * Alle Variablen einladen wenn keine uebergeben wurden
| * ContextInstance ci = executionContext.getContextInstance();
| * Iterator it = ci.getVariables().entrySet().iterator();
| * while(it.hasNext()){ workingMemory.assertObject( it.next() ); } }
| */
|
| }
|
| }
|
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