Examples of org.drools.compiler.PackageBuilder

org.drools.compiler.PackageBuilder
This is the main compiler class for parsing and compiling rules and assembling or merging them into a binary Package instance. This can be done by merging into existing binary packages, or totally from source. If you are using the Java dialect the JavaDialectConfiguration will attempt to validate that the specified compiler is in the classpath, using ClassLoader.loasClass(String). If you intented to just Janino sa the compiler you must either overload the compiler property before instantiating this class or the PackageBuilder, or make sure Eclipse is in the classpath, as Eclipse is the default. Normally, a complete package is built using one of the applicable addPackageFromXXX methods. It is however possible to construct a package incrementally by adding individual component parts. When a package is built incrementally package level attributes are cached and applied to Rules subsequently added. Caution should be exercised when using the same PackageBuilder to construct packages from multiple sources as the cached package level attributes will still apply even if the resource added to PackageBuilder does not explicitly include package level attributes.

        ProcessInstanceDbLog.clear();
  }
  
    private static RuleBase createKnowledgeBase() {
        // create a builder
        PackageBuilder builder = new PackageBuilder();
        // load the process
        Reader source = new InputStreamReader(
            WorkingMemoryDbLoggerTest.class.getResourceAsStream("/ruleflow.rf"));
        builder.addProcessFromXml(source);
        source = new InputStreamReader(
        WorkingMemoryDbLoggerTest.class.getResourceAsStream("/ruleflow2.rf"));
        builder.addProcessFromXml(source);
        // create the knowledge base 
        Package pkg = builder.getPackage();
        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage(pkg);
        return ruleBase;
    }

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    /**
     * Creates the knowledge base by loading the process definition.
     */
    private static RuleBase createKnowledgeBase() throws Exception {
        // create a builder
        PackageBuilder builder = new PackageBuilder();
        // load the process
        Reader source = new InputStreamReader(
            ProcessInstanceExecutor.class.getResourceAsStream("/ruleflow.rf"));
        builder.addProcessFromXml(source);
        source = new InputStreamReader(
            ProcessInstanceExecutor.class.getResourceAsStream("/ruleflow2.rf"));
        builder.addProcessFromXml(source);
       // create the knowledge base 
        Package pkg = builder.getPackage();
        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage(pkg);
        return ruleBase;
    }

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        assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
        assertEquals(0, workingMemory.getProcessInstances().size());
    }


  private static RuleBase readDynamicSubProcess() throws Exception {
    PackageBuilder builder = new PackageBuilder();
    Reader source = new StringReader(
      "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
      "<process xmlns=\"http://drools.org/drools-5.0/process\"\n" +
      "         xmlns:xs=\"http://www.w3.org/2001/XMLSchema-instance\"\n" +
      "         xs:schemaLocation=\"http://drools.org/drools-5.0/process drools-processes-5.0.xsd\"\n" +
      "         type=\"RuleFlow\" name=\"ruleflow\" id=\"com.sample.ruleflow\" package-name=\"com.sample\" >\n" +
      "\n" +
      "  <header>\n" +
      "    <variables>\n" +
      "      <variable name=\"x\" >\n" +
      "        <type name=\"org.drools.process.core.datatype.impl.type.StringDataType\" />\n" +
      "        <value></value>\n" +
      "      </variable>\n" +
      "    </variables>\n" + 
      "  </header>\n" +
      "\n" +
      "  <nodes>\n" +
      "    <start id=\"1\" name=\"Start\" />\n" +
      "    <subProcess id=\"2\" name=\"SubProcess\" processId=\"com.sample.#{x}\" />\n" +
      "    <end id=\"3\" name=\"End\" />\n" +
      "  </nodes>\n" +
      "\n" +
      "  <connections>\n" +
      "    <connection from=\"1\" to=\"2\" />\n" +
      "    <connection from=\"2\" to=\"3\" />\n" +
      "  </connections>\n" +
      "\n" +
      "</process>");
    builder.addRuleFlow(source);
    source = new StringReader(
      "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
      "<process xmlns=\"http://drools.org/drools-5.0/process\"\n" +
      "         xmlns:xs=\"http://www.w3.org/2001/XMLSchema-instance\"\n" +
      "         xs:schemaLocation=\"http://drools.org/drools-5.0/process drools-processes-5.0.xsd\"\n" +
      "         type=\"RuleFlow\" name=\"flow\" id=\"com.sample.subflow\" package-name=\"com.sample\" >\n" +
      "\n" +
      "  <header>\n" +
      "    <imports>\n" +
      "      <import name=\"org.jbpm.Person\" />\n" +
      "    </imports>\n" +
      "  </header>\n" +
      "\n" +
      "  <nodes>\n" +
      "    <start id=\"1\" name=\"Start\" />\n" +
      "    <milestone id=\"2\" name=\"Event Wait\" >\n" +
            "      <constraint type=\"rule\" dialect=\"mvel\" >Person( )</constraint>" +
            "    </milestone>\n" +
      "    <end id=\"3\" name=\"End\" />\n" +
      "  </nodes>\n" +
      "\n" +
      "  <connections>\n" +
      "    <connection from=\"1\" to=\"2\" />\n" +
      "    <connection from=\"2\" to=\"3\" />\n" +
      "  </connections>\n" +
      "\n" +
      "</process>");
    builder.addRuleFlow(source);
    Package pkg = builder.getPackage();
    RuleBase ruleBase = RuleBaseFactory.newRuleBase();
    ruleBase.addPackage( pkg );
    return ruleBase;
  }

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        process.setPackageName( "pkg1" );


        ReturnValueDescr descr = new ReturnValueDescr();
        descr.setText( "return value;" );


        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
        JavaDialect javaDialect = (JavaDialect) dialectRegistry.getDialect( "java" );


        ProcessBuildContext context = new ProcessBuildContext( pkgBuilder,
                                                               pkg,
                                                               process,
                                                               processDescr,
                                                               dialectRegistry,
                                                               javaDialect );


        pkgBuilder.addPackageFromDrl( new StringReader( "package pkg1;\nglobal Boolean value;" ) );


        ReturnValueConstraintEvaluator node = new ReturnValueConstraintEvaluator();


        final JavaReturnValueEvaluatorBuilder builder = new JavaReturnValueEvaluatorBuilder();
        builder.build( context,
                       node,
                       descr,
                       null );


        ProcessDialectRegistry.getDialect(JavaDialect.ID).addProcess( context );
        javaDialect.compileAll();
        assertEquals( 0, javaDialect.getResults().size() );


        final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        List<KnowledgePackage> packages = new ArrayList<KnowledgePackage>();
        packages.add( new KnowledgePackageImp(pkgBuilder.getPackage()) );
        kbase.addKnowledgePackages( packages );
        final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();


        ksession.setGlobal( "value", true );

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        return RuleBaseFactory.newRuleBase( RuleBase.RETEOO,
                                            config );
    }


    public void testRuleFlowConstraintDialects() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addRuleFlow( new InputStreamReader( getClass().getResourceAsStream( "test_ConstraintDialects.rfm" ) ) );


        System.err.print( builder.getErrors() );


        assertEquals( 0,
                      builder.getErrors().getErrors().length );


        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( builder.getPackage() );
        ruleBase = SerializationHelper.serializeObject( ruleBase );


        StatefulSession session = ruleBase.newStatefulSession();
        List<Integer> inList = new ArrayList<Integer>();
        List<Integer> outList = new ArrayList<Integer>();

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        } catch ( Exception e ) {
        }
    }


    public void testRuleFlow() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.drl" ) ) );
        builder.addRuleFlow( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.rfm" ) ) );
        final Package pkg = builder.getPackage();
        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );


        final WorkingMemory workingMemory = ruleBase.newStatefulSession();

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        assertEquals( ProcessInstance.STATE_COMPLETED,
                      processInstance.getState() );
    }


    public void testRuleFlowUpgrade() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        // Set the system property so that automatic conversion can happen
        System.setProperty( "drools.ruleflow.port",
                            "true" );


        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.drl" ) ) );
        builder.addRuleFlow( new InputStreamReader( getClass().getResourceAsStream( "ruleflow40.rfm" ) ) );
        final Package pkg = builder.getPackage();
        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );


        final WorkingMemory workingMemory = ruleBase.newStatefulSession();

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        System.setProperty( "drools.ruleflow.port",
                            "false" );
    }


    public void testRuleFlowClear() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "test_ruleflowClear.drl" ) ) );
        builder.addRuleFlow( new InputStreamReader( getClass().getResourceAsStream( "test_ruleflowClear.rfm" ) ) );
        final Package pkg = builder.getPackage();
        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );


        final WorkingMemory workingMemory = ruleBase.newStatefulSession();

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        assertEquals( 4,
                      activations.size() );
    }


    public void testRuleFlowInPackage() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.drl" ) ) );
        builder.addRuleFlow( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.rfm" ) ) );
        final Package pkg = builder.getPackage();


        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );

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    }


    public void testLoadingRuleFlowInPackage1() throws Exception {
        // adding ruleflow before adding package
        final PackageBuilder builder = new PackageBuilder();
        builder.addRuleFlow( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.rfm" ) ) );
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "ruleflow.drl" ) ) );
        builder.getPackage();
    }

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org.drools.base.ClassFieldAccessorCache

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