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 = ksession.getProcessInstance( processInstance.getId() );
        assertNull( processInstance );
    }
    
    public void testPersistenceVariables() {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( new ClassPathResource( "VariablesProcess.rf" ), ResourceType.DRF );
        for (KnowledgeBuilderError error: kbuilder.getErrors()) {
            System.out.println(error);
        }
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" );
        Environment env = KnowledgeBaseFactory.newEnvironment();
        env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );

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        str += "then\n";
        str += "  list.add( 1 );\n";
        str += "end\n";
        str += "\n";


        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ),
                      ResourceType.DRL );
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();


        if ( kbuilder.hasErrors() ) {
            fail( kbuilder.getErrors().toString() );
        }


        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" );
        Environment env = KnowledgeBaseFactory.newEnvironment();
        env.set( EnvironmentName.ENTITY_MANAGER_FACTORY,
                 emf );

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            }
        }
    }


    private KnowledgeBase createKnowledgeBase(File[] files) throws MojoExecutionException {
        KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        builder.add(ResourceFactory.newClassPathResource("drools-globals.drl", getClass()), ResourceType.DRL);
        for (File file : files) {
            getLog().info("Parsing rule file " + file.getAbsolutePath());
            builder.add(ResourceFactory.newFileResource(file), ResourceType.DRL);
        }
        if (builder.hasErrors()) {
            getLog().error("Rule errors:");
            for (KnowledgeBuilderError error : builder.getErrors()) {
                getLog().error(error.toString());
            }
            throw new MojoExecutionException("Unable to create rules. See log for details.");
        }


        KnowledgeBase base = KnowledgeBaseFactory.newKnowledgeBase();
        base.addKnowledgePackages(builder.getKnowledgePackages());
        return base;
    }

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    @Inject
    public void init() {
        KnowledgeBuilderConfiguration config = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
        KnowledgeBaseConfiguration kBaseConfig = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();


        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(config);


        InputStream rules = securityRules != null ? securityRules : webInfSecurityRules;
        
        if (rules != null) {
            org.drools.io.Resource resource = ResourceFactory.newInputStreamResource(rules);


            kbuilder.add(resource, ResourceType.DRL);
    
            KnowledgeBuilderErrors kbuildererrors = kbuilder.getErrors();
            if (kbuildererrors.size() > 0) {
                for (KnowledgeBuilderError kbuildererror : kbuildererrors) {
                    log.error(kbuildererror.getMessage());
                }
            }
    
            kbase = KnowledgeBaseFactory.newKnowledgeBase(kBaseConfig);
            kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
        } else {
            log.warn("No security rules configured - rule base permissions will be unavailable.");
        }
    }

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        return template.requestBody( "direct:unmarshal",
                                     inXml );
    }


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


        if ( kbuilder.hasErrors() ) {
            fail( kbuilder.getErrors().toString() );
        }


        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() );
            throw new RuntimeException( kbuilder.getErrors().toString() );
        }


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


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();


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

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                      result.getValue( "outBrie" ) );
    }


    @Test
    public void testProcess() throws Exception {
        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 += "    <imports>\n";
        str += "      <import name=\"org.drools.camel.testdomain.TestVariable\" />\n";
        str += "    </imports>\n";
        str += "    <globals>\n";
        str += "      <global identifier=\"list1\" type=\"java.util.List\" />\n";
        str += "    </globals>\n";
        str += "    <variables>\n";
        str += "      <variable name=\"person\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.ObjectDataType\" className=\"TestVariable\" />\n";
        str += "      </variable>\n";
        str += "    </variables>\n";
        str += "  </header>\n";
        str += "\n";
        str += "  <nodes>\n";
        str += "    <start id=\"1\" name=\"Start\" />\n";
        str += "    <actionNode id=\"2\" name=\"MyActionNode\" >\n";
        str += "      <action type=\"expression\" dialect=\"mvel\" >System.out.println(\"Triggered\");\n";
        str += "list1.add(person.name);\n";
        str += "</action>\n";
        str += "    </actionNode>\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" + "\n";
        str += "</process>";


        Reader source = new StringReader( str );
        kbuilder.add( ResourceFactory.newReaderResource( source ),
                      ResourceType.DRF );
        if ( kbuilder.hasErrors() ) {
            fail( kbuilder.getErrors().toString() );
        }


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal( "list1",
                            list );

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                      list.get( 0 ) );
    }


    @Test
    public void testProcessInstanceSignalEvent() throws Exception {
        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.event\" package-name=\"org.drools\" version=\"1\" >\n";
        str += "\n";
        str += "  <header>\n";
        str += "    <variables>\n";
        str += "      <variable name=\"MyVar\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "        <value>SomeText</value>\n";
        str += "      </variable>\n";
        str += "    </variables>\n";
        str += "  </header>\n";
        str += "\n";
        str += "  <nodes>\n";
        str += "    <start id=\"1\" name=\"Start\" />\n";
        str += "    <eventNode id=\"2\" name=\"Event\" variableName=\"MyVar\" >\n";
        str += "      <eventFilters>\n";
        str += "        <eventFilter type=\"eventType\" eventType=\"MyEvent\" />\n";
        str += "      </eventFilters>\n";
        str += "    </eventNode>\n";
        str += "    <join id=\"3\" name=\"Join\" type=\"1\" />\n";
        str += "    <end id=\"4\" name=\"End\" />\n";
        str += "  </nodes>\n";
        str += "\n";
        str += "  <connections>\n";
        str += "    <connection from=\"1\" to=\"3\" />\n";
        str += "    <connection from=\"2\" to=\"3\" />\n";
        str += "    <connection from=\"3\" to=\"4\" />\n";
        str += "  </connections>\n";
        str += "\n";
        str += "</process>";


        kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ),
                      ResourceType.DRF );


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        setExec( ksession );


        ProcessInstance processInstance = ksession.startProcess( "org.drools.event" );

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                      ((VariableScopeInstance) ((org.jbpm.process.instance.ProcessInstance) processInstance).getContextInstance( VariableScope.VARIABLE_SCOPE )).getVariable( "MyVar" ) );
    }


    @Test
    public void testProcessRuntimeSignalEvent() throws Exception {
        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.event\" package-name=\"org.drools\" version=\"1\" >\n";
        str += "\n";
        str += "  <header>\n";
        str += "    <variables>\n";
        str += "      <variable name=\"MyVar\" >\n";
        str += "        <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n";
        str += "        <value>SomeText</value>\n";
        str += "      </variable>\n";
        str += "    </variables>\n";
        str += "  </header>\n";
        str += "\n";
        str += "  <nodes>\n";
        str += "    <start id=\"1\" name=\"Start\" />\n";
        str += "    <eventNode id=\"2\" name=\"Event\" scope=\"external\" variableName=\"MyVar\" >\n";
        str += "      <eventFilters>\n";
        str += "        <eventFilter type=\"eventType\" eventType=\"MyEvent\" />\n";
        str += "      </eventFilters>\n";
        str += "    </eventNode>\n";
        str += "    <join id=\"3\" name=\"Join\" type=\"1\" />\n";
        str += "    <end id=\"4\" name=\"End\" />\n";
        str += "  </nodes>\n";
        str += "\n";
        str += "  <connections>\n";
        str += "    <connection from=\"1\" to=\"3\" />\n";
        str += "    <connection from=\"2\" to=\"3\" />\n";
        str += "    <connection from=\"3\" to=\"4\" />\n";
        str += "  </connections>\n";
        str += "\n";
        str += "</process>";


        kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ),
                      ResourceType.DRF );


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        setExec( ksession );


        ProcessInstance processInstance = ksession.startProcess( "org.drools.event" );

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                      ((VariableScopeInstance) ((org.jbpm.process.instance.ProcessInstance) processInstance).getContextInstance( VariableScope.VARIABLE_SCOPE )).getVariable( "MyVar" ) );
    }


    @Test
    public void testCompleteWorkItem() {
        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 );


        kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ),
                      ResourceType.DRF );


        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );


        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        setExec( ksession );


        TestWorkItemHandler handler = new TestWorkItemHandler();

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