Examples of org.drools.builder.KnowledgeBuilder

org.drools.builder.KnowledgeBuilder

es.drl" ), ResourceType.DRL); assertFalse( kbuilder.hasErrors() ); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

Simple example showing how to build a KnowledgeBase from an XLS decision table resource.

 KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); DecisionTableConfiguration dtconf = KnowledgeBuilderFactory.newDecisionTableConfiguration(); dtconf.setInputType( DecisionTableInputType.XLS ); dtconf.setWorksheetName( "Tables_2" ); kbuilder.add( ResourceFactory.newUrlResource( "file://IntegrationExampleTest.xls" ), ResourceType.DTABLE, dtconf ); assertFalse( kbuilder.hasErrors() ); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

Simple example showing how to build a KnowledgeBase from an DRF flow resource.

 KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add( ResourceFactory.newUrlResource( "file://myflow.rf" ), ResourceType.DRF); assertFalse( kbuilder.hasErrors() ); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

If there are errors a simple toString can print the errors

 if ( kbuilder.hasErrors() ) { log.exception( kbuilder.getErrors().toString() ) }

The KnowledgeBuilder can also be built from a configuration using the XML change-set format and the ResourceType.CHANGE_SET value. While change-set supports add, remove, and modify as elements. KnowledgeBuilder will only process add. If the resource element provided points to a directory, all files found in that directory will be added. Currently the knowledge type is not derived from the file extension and must be explicitly set in the XML for the resource. It is expected that all resources in a directory given resource are of the specified type.

 <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='drools-change-set-5.0.xsd' > <add> <resource source='http:org/domain/myrules.drl' type='DRL' /> <resource source='classpath:data/IntegrationExampleTest.xls' type="DTABLE"> <decisiontable-conf input-type="XLS" worksheet-name="Tables_2" /> </resource> <resource source='file:org/drools/decisiontable/myflow.drf' type='DRF' /> </add> </change-set>

 KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "test agent", // the name of the agent kaconf ); kagent.applyChangeSet( ResourceFactory.newUrlResource( url ) ); // resource to the change-set xml for the resources to add

                      processInstance.getVariable( "Number" ) );
    }


    @Test
    public void testAbortWorkItem() {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();


        String str = "";
        str += "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
        str += "<process xmlns=\"http://drools.org/drools-5.0/process\"\n";
        str += "         xmlns:xs=\"http://www.w3.org/2001/XMLSchema-instance\"\n";
        str += "         xs:schemaLocation=\"http://drools.org/drools-5.0/process drools-processes-5.0.xsd\"\n";
        str += "         type=\"RuleFlow\" name=\"flow\" id=\"org.drools.actions\" package-name=\"org.drools\" version=\"1\" >\n";
        str += "\n";
        str += "  <header>\n";
        str += "    <variables>\n";
        str += "      <variable name=\"UserName\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "        <value>John Doe</value>\n";
        str += "      </variable>\n";
        str += "      <variable name=\"Person\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.ObjectDataType\" className=\"org.drools.camel.testdomain.Person\" />\n";
        str += "      </variable>\n";
        str += "      <variable name=\"MyObject\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.ObjectDataType\" className=\"java.lang.Object\" />\n";
        str += "      </variable>\n";
        str += "      <variable name=\"Number\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.IntegerDataType\" />\n";
        str += "      </variable>\n";
        str += "    </variables>\n";
        str += "  </header>\n";
        str += "\n";
        str += "  <nodes>\n";
        str += "    <start id=\"1\" name=\"Start\" />\n";
        str += "    <workItem id=\"2\" name=\"HumanTask\" >\n";
        str += "      <work name=\"Human Task\" >\n";
        str += "        <parameter name=\"ActorId\" >\n";
        str += "          <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "          <value>#{UserName}</value>\n";
        str += "        </parameter>\n";
        str += "        <parameter name=\"Content\" >\n";
        str += "          <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "          <value>#{Person.name}</value>\n";
        str += "        </parameter>\n";
        str += "        <parameter name=\"TaskName\" >\n";
        str += "          <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "          <value>Do something</value>\n";
        str += "        </parameter>\n";
        str += "        <parameter name=\"Priority\" >\n";
        str += "          <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "        </parameter>\n";
        str += "        <parameter name=\"Comment\" >\n";
        str += "          <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "        </parameter>\n";
        str += "        <parameter name=\"Attachment\" >\n";
        str += "          <type name=\"org.drools.process.core.datatype.impl.type.ObjectDataType\" className=\"java.lang.Object\" />\n";
        str += "        </parameter>\n";
        str += "      </work>\n";
        str += "      <mapping type=\"in\" from=\"MyObject\" to=\"Attachment\" />";
        str += "      <mapping type=\"in\" from=\"Person.name\" to=\"Comment\" />";
        str += "      <mapping type=\"out\" from=\"Result\" to=\"MyObject\" />";
        str += "      <mapping type=\"out\" from=\"Result.length()\" to=\"Number\" />";
        str += "    </workItem>\n";
        str += "    <end id=\"3\" name=\"End\" />\n";
        str += "  </nodes>\n";
        str += "\n";
        str += "  <connections>\n";
        str += "    <connection from=\"1\" to=\"2\" />\n";
        str += "    <connection from=\"2\" to=\"3\" />\n";
        str += "  </connections>\n";
        str += "\n";
        str += "</process>";


        Reader source = new StringReader( str );
        kbuilder.add( ResourceFactory.newReaderResource( source ),
                      ResourceType.DRF );


        Collection<KnowledgePackage> kpkgs = kbuilder.getKnowledgePackages();
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kpkgs );
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();


        TestWorkItemHandler handler = new TestWorkItemHandler();

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        assertXMLEqual( expectedXml2,
                        outXml2 );
    }
    
    private StatelessKnowledgeSession getStatelessKnowledgeSession(Resource resource) throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( resource,
                      ResourceType.DRL );


        if ( kbuilder.hasErrors() ) {
            System.out.println( kbuilder.getErrors() );
        }


        assertFalse( kbuilder.hasErrors() );
        Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();


        kbase.addKnowledgePackages( pkgs );
        StatelessKnowledgeSession session = kbase.newStatelessKnowledgeSession();

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        return session;
    }


    private StatefulKnowledgeSession getStatefulKnowledgeSession(Resource resource) throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( resource,
                      ResourceType.DRL );


        if ( kbuilder.hasErrors() ) {
            System.out.println( kbuilder.getErrors() );
        }


        assertFalse( kbuilder.hasErrors() );
        Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();


        kbase.addKnowledgePackages( pkgs );
        StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession();

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        return session;
    }
    
    private StatefulKnowledgeSession getStatefulKnowledgeSession2(Resource resource) throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( resource,
                      ResourceType.DRL );


        if ( kbuilder.hasErrors() ) {
            System.out.println( kbuilder.getErrors() );
        }


        assertFalse( kbuilder.hasErrors() );
        Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();


        kbase.addKnowledgePackages( pkgs );
        StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession();

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      return loadKnowledgeBase(ruleSource);


    }


    // Load the rules
    KnowledgeBuilder localBuilder = KnowledgeBuilderFactory
    .newKnowledgeBuilder();


    for (String ruleFile : ruleSource.getRulesLocation()) {
      log.info("Loading file: " + ruleFile);


      // Check the type of rule file, then load it
      if (ruleFile.endsWith(RedConstants.XLS_FILE_EXTENSION)) {


        log.info("Loading Excel file: " + ruleFile);
        loadExcelRules(ruleFile, localBuilder);
      } else {


        log.info("Loading Drl file: " + ruleFile);
        loadDrlRules(ruleFile, ruleSource.getDslFileLocation(),
            ruleSource.getRuleFlowFileUrl(), localBuilder);
      }


    }


    // check that there are no errors
    if (localBuilder.hasErrors()) {


      log.severe("Drools Errors");
      KnowledgeBuilderErrors errors = localBuilder.getErrors();
      Iterator<KnowledgeBuilderError> itErrors = errors.iterator();
      int[] errorLines;
      StringBuffer errorLineMessage;
      while (itErrors.hasNext()) {
        KnowledgeBuilderError thisError = itErrors.next();
        log.severe(thisError.getMessage());
        log.severe(thisError.toString());
        errorLines = thisError.getErrorLines();
        errorLineMessage = new StringBuffer();
        if (errorLines != null) {
          for (int errorLine : errorLines) {
            errorLineMessage.append(errorLine);
            errorLineMessage.append(",");
          }
          log.severe("Error Lines:" + errorLineMessage.toString());
        }


      }


      log.severe("****/nDrools Errors:"
          + localBuilder.getErrors().toString());
      log.severe("****/nEnd Drools Errors");


      throw new RuntimeException("Error in Rules File:"
          + localBuilder.getErrors().toString());


    } else {
      log.info("No Drools Errors");
    }


    // Print out what we know of the built packages
    logKnowledgePackages(localBuilder);


    // Use these
    log.info("Creating new knowledgebase");
    KnowledgeBase localBase = KnowledgeBaseFactory.newKnowledgeBase();


    log.info("Adding packages to localBase");
    localBase.addKnowledgePackages(localBuilder.getKnowledgePackages());


    return localBase;
  }

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                buildResourcesList(kBaseQualifier, kBaseQualifier.getName(), list);
                map.put(kBaseQualifier, list);
            }
        }


        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        CompositeKnowledgeBuilder ckbuilder = kbuilder.batch();


        for ( Map.Entry<Class, List<String>> entry : map.entrySet() ) {
            Class cls = entry.getKey();
            List<String> files = entry.getValue();
            if ( !files.isEmpty() ) {
                for ( String file : files ) {
                    if ( file.endsWith(".drl" ) ) {
                        ckbuilder.add( ResourceFactory.newUrlResource( cls.getResource("/" + file.trim()) ), ResourceType.DRL );
                    }
                }
            }
        }


        ckbuilder.build();




        if ( kbuilder.hasErrors() ) {
            throw new RuntimeException( "Unable to compile " + kBaseQualifiers[0].getName() + ":\n" + kbuilder.getErrors() );
        }


        KnowledgeBaseConfiguration kconf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
        kconf.setOption( eventProcessingMode);
        kconf.setOption( equalsBehaviour );
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(kconf);
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
        return kbase;
    }

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    public KnowledgeBaseAddKnowledgePackagesCommand() {
    }


    public Void execute(Context context) {
        KnowledgeBuilder kbuilder = ((KnowledgeCommandContext) context).getKnowledgeBuilder();
        if (kbuilder.hasErrors()) {
            throw new IllegalStateException("There are rule compilation errors:\n" + kbuilder.getErrors().toString());
        }
        KnowledgeBase kbase = ((KnowledgeCommandContext) context).getKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
        return null;
    }

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     * @param changeSetState the object containing the added resources list and
     * created pacages list.
     */
    private void addResourcesToKnowledgeBase(ChangeSetState changeSetState) {


        KnowledgeBuilder kbuilder =  KnowledgeBuilderFactory.newKnowledgeBuilder();
        List<Package> packages = new ArrayList<Package>();




        for (Resource resource : changeSetState.addedResources) {
            KnowledgePackageImp createdPackage = this.createPackageFromResource(resource, kbuilder);
            changeSetState.createdPackages.put(resource, createdPackage);
        }




        for (Map.Entry<Resource, KnowledgePackage> entry : changeSetState.createdPackages.entrySet()) {
            // For PKG (.pks) just add them
            Resource resource = entry.getKey();
            this.listener.debug("KnowledgeAgent obtaining pkg resource="
                    + resource);


            try {
                Package pkg = ((KnowledgePackageImp) entry.getValue()).pkg;
                for (Rule rule : pkg.getRules()) {
                    rule.setResource(resource);
                }
                packages.add(pkg);


                this.buildResourceMapping(pkg, resource);
            } catch (Exception e) {
                this.listener.exception(new RuntimeException(
                        "KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage  ",
                        e));
            }
        }


        if (kbuilder
                != null) {
            // Log any errors we come across
            if (kbuilder.hasErrors()) {
                this.listener.warning(
                        "KnowledgeAgent has KnowledgeBuilder errors ", kbuilder.getErrors());
            }
            this.listener.debug("KnowledgeAgent adding KnowledgePackages from KnowledgeBuilder");
            this.kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
        }
        /*
         * Add all the packages we found, but did not build, from the resources
         * now
         */

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        GridServiceDescription<GridNode> n1Gsd = grid.get(WhitePages.class).lookup("n1");
        GridConnection<GridNode> conn = grid.get(ConnectionFactoryService.class).createConnection(n1Gsd);
        GridNode remoteN1 = conn.connect();




        KnowledgeBuilder kbuilder = remoteN1.get(KnowledgeBuilderFactoryService.class).newKnowledgeBuilder();


        //kbuilder.add(new ByteArrayResource(IOUtils.toByteArray(new ClassPathResource("rules/patient.drl").getInputStream())), ResourceType.DRL);
        kbuilder.add(new ByteArrayResource(IOUtils.toByteArray(new ClassPathResource("rules/patient.dsl").getInputStream())), ResourceType.DSL);
        kbuilder.add(new ByteArrayResource(IOUtils.toByteArray(new ClassPathResource("rules/patient.dslr").getInputStream())), ResourceType.DSLR);


        KnowledgeBuilderErrors errors = kbuilder.getErrors();
        if (errors != null && errors.size() > 0) {
            for (KnowledgeBuilderError error : errors) {
                System.out.println(">>>>>>> Error: " + error.getMessage());


            }
            throw new IllegalStateException("Failed to parse knowledge!");
        }
        KnowledgeBaseConfiguration kbaseConf = remoteN1.get(KnowledgeBaseFactoryService.class).newKnowledgeBaseConfiguration();
        kbaseConf.setOption(EventProcessingOption.STREAM);
        KnowledgeBase kbase = remoteN1.get(KnowledgeBaseFactoryService.class).newKnowledgeBase(kbaseConf);




        kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());


        StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession();


        remoteN1.set("AmbulanceMonitorSession" + vehicleId, session);

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    }
    @Test
    public void hello(){}
    
    protected StatefulKnowledgeSession createSession(){
        KnowledgeBuilder kbuilder = remoteN1.get( KnowledgeBuilderFactoryService.class ).newKnowledgeBuilder();


        assertNotNull( kbuilder );


         String rule = "package test\n"
                 + "import com.wordpress.salaboy.MyObject;\n"
                 + "global MyObject myGlobalObj;\n"
                 + "rule \"test\""
                 + "  when"
                 + "       $o: MyObject()"
                 + "  then"
                 + "      System.out.println(\"My Global Object -> \"+myGlobalObj.getName());"
                 + "      System.out.println(\"Rule Fired! ->\"+$o.getName());"
                 + " end";


        kbuilder.add( new ByteArrayResource( rule.getBytes() ),
                      ResourceType.DRL );


        KnowledgeBuilderErrors errors = kbuilder.getErrors();
        if ( errors != null && errors.size() > 0 ) {
            for ( KnowledgeBuilderError error : errors ) {
                System.out.println( "Error: " + error.getMessage() );


            }
            fail("KnowledgeBase did not build");
        }


        KnowledgeBase kbase = remoteN1.get( KnowledgeBaseFactoryService.class ).newKnowledgeBase();


        assertNotNull( kbase );


        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession();
        return session;
    
    }

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