Examples of org.drools.compiler.compiler.PackageBuilder

org.drools.compiler.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.


        Package pkg = new Package( "org.drools.compiler.test" );
        pkg.addImport( new ImportDeclaration( Cheese.class.getCanonicalName() ) );


        PackageBuilderConfiguration conf = new PackageBuilderConfiguration();
        PackageBuilder pkgBuilder = new PackageBuilder( pkg,
                                                        conf );


        ruleDescr = new RuleDescr( "test consequence builder" );
        ruleDescr.setConsequence( consequence );
        ruleDescr.addAttribute( new AttributeDescr("dialect", "mvel") );
        
        for ( Entry<String, Object> entry : namedConsequences.entrySet() ) {
            ruleDescr.addNamedConsequences( entry.getKey(), entry.getValue() );
        }


        Rule rule = new Rule( ruleDescr.getName() );
        rule.addPattern( new Pattern( 0,
                                      new ClassObjectType( Cheese.class ),
                                      "$cheese" ) );
        
        rule.addPattern( new Pattern( 0,
                                      new ClassObjectType( Map.class ),
                                      "$map" ) );        


        PackageRegistry pkgRegistry = pkgBuilder.getPackageRegistry( pkg.getName() );
        DialectCompiletimeRegistry reg = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
        context = new RuleBuildContext( pkgBuilder,
                                        ruleDescr,
                                        reg,
                                        pkg,
                                        reg.getDialect( pkgRegistry.getDialect() ) );
        context.getBuildStack().push( rule.getLhs() );
        
        context.getDialect().getConsequenceBuilder().build( context, Rule.DEFAULT_CONSEQUENCE_NAME );
        for ( String name : namedConsequences.keySet() ) {
            context.getDialect().getConsequenceBuilder().build( context, name );
        }
        
        context.getDialect().addRule( context );
        pkgRegistry.getPackage().addRule( context.getRule() );
        pkgBuilder.compileAll();
        pkgBuilder.reloadAll();
        if ( pkgBuilder.hasErrors() ) {
            fail(pkgBuilder.getErrors().toString());
        }
    }

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    }


    @Test
    public void testDuplicateLocalVariableMVELConsequence() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "test_DuplicateLocalVariableMVELConsequence.drl" ) ) );


        assertTrue( builder.hasErrors() );
    }

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        }        
    }
    


    private Package compileRule(String drl) throws Exception {
        PackageBuilder builder = new PackageBuilder( new PackageBuilderConfiguration() );


        builder.addPackageFromDrl( new StringReader( drl ) );
        Package pkg = builder.getPackage();


        if ( !pkg.isValid() ) {
            throw new DroolsParserException( pkg.getErrorSummary() );
        }
        return pkg;

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    @Test
    public void testSimpleExpression() {
        final Package pkg = new Package( "pkg1" );
        final RuleDescr ruleDescr = new RuleDescr( "rule 1" );


        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
        final PackageBuilderConfiguration conf = pkgBuilder.getPackageBuilderConfiguration();
        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
        MVELDialect mvelDialect = ( MVELDialect ) dialectRegistry.getDialect( "mvel" );


        final InstrumentedBuildContent context = new InstrumentedBuildContent( pkgBuilder,
                                                                               ruleDescr,
                                                                               dialectRegistry,
                                                                               pkg,                                                                               
                                                                               mvelDialect );


        final InstrumentedDeclarationScopeResolver declarationResolver = new InstrumentedDeclarationScopeResolver();


        final InternalReadAccessor extractor = store.getReader( Cheese.class,
                                                             "price",
                                                             getClass().getClassLoader() );


        final Pattern pattern = new Pattern( 0,
                                             new ClassObjectType( int.class ) );
        final Declaration declaration = new Declaration( "a",
                                                         extractor,
                                                         pattern );
        final Map map = new HashMap();
        map.put( "a",
                 declaration );
        declarationResolver.setDeclarations( map );
        context.setDeclarationResolver( declarationResolver );


        final EvalDescr evalDescr = new EvalDescr();
        evalDescr.setContent( "a == 10" );


        final MVELEvalBuilder builder = new MVELEvalBuilder();
        final EvalCondition eval = (EvalCondition) builder.build( context,
                                                                  evalDescr );
        ((MVELEvalExpression) eval.getEvalExpression()).compile( (MVELDialectRuntimeData) pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectRuntimeRegistry().getDialectData( "mvel" ) );


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        final InternalWorkingMemory wm = (InternalWorkingMemory) ruleBase.newStatefulSession();


        MockLeftTupleSink sink = new MockLeftTupleSink();

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    @Test
    public void testSimpleExpression() {
        final Package pkg = new Package( "pkg1" );
        final RuleDescr ruleDescr = new RuleDescr( "rule 1" );


        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
        final PackageBuilderConfiguration conf = pkgBuilder.getPackageBuilderConfiguration();
        PackageRegistry pkgRegistry = pkgBuilder.getPackageRegistry( pkg.getName() );
        MVELDialect mvelDialect = ( MVELDialect ) pkgRegistry.getDialectCompiletimeRegistry().getDialect( "mvel" );


        final InstrumentedBuildContent context = new InstrumentedBuildContent( pkgBuilder,
                                                                               ruleDescr,
                                                                               pkgRegistry.getDialectCompiletimeRegistry(),

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                      "rule R1 when\n" +
                      "   StockTick()\n" +
                      "then\n" +
                      "end\n";


        PackageBuilder pkgbuilder = new PackageBuilder();
        pkgbuilder.addPackageFromDrl( new StringReader( rule ) );
        assertFalse( pkgbuilder.getErrors().toString(), pkgbuilder.hasErrors() );


        Package pkg = pkgbuilder.getPackage();


        byte[] spkg = DroolsStreamUtils.streamOut( pkg );


        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( ResourceFactory.newByteArrayResource( spkg ), ResourceType.PKG );

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                      "rule R1 when\n" +
                      "   StockTick()\n" +
                      "then\n" +
                      "end\n";


        PackageBuilder pkgbuilder = new PackageBuilder();
        pkgbuilder.addPackageFromDrl( new StringReader( rule ) );
        assertFalse( pkgbuilder.getErrors().toString(), pkgbuilder.hasErrors() );


        Package[] pkgs = pkgbuilder.getPackages();


        byte[] spkgs = DroolsStreamUtils.streamOut( pkgs );


        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( ResourceFactory.newByteArrayResource( spkgs ), ResourceType.PKG );

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                      l.size() );
    }


    @Test
    public void testLogicalInsertionsNoLoop() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "test_LogicalInsertionsNoLoop.drl" ) ) );
        final Package pkg = builder.getPackage();


        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject(ruleBase);
        final WorkingMemory workingMemory = ruleBase.newStatefulSession();

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    }


    @Test
    @Ignore("in Java 8, the byte[] generated by serialization are not the same and requires investigation")
    public void testLogicalInsertionsWithModify() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "test_LogicalInsertionsWithUpdate.drl" ) ) );
        if ( builder.hasErrors() ) {
            fail( builder.getErrors().toString() );
        }
        final Package pkg = builder.getPackage();


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

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                      m.size() );
    }


    @Test
    public void testLogicalInsertions2() throws Exception {
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "test_LogicalInsertions2.drl" ) ) );
        final Package pkg = builder.getPackage();


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

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Related Classes of org.drools.compiler.compiler.PackageBuilder

org.drools.compiler.builder.impl.KnowledgeBuilderFactoryServiceImpl

org.drools.compiler.CommonTestMethodBase

org.drools.compiler.compiler.xml.XmlPackageReader

org.drools.compiler.integrationtests.ConsequenceOffsetTest

org.drools.compiler.integrationtests.DynamicRulesTest

org.drools.compiler.integrationtests.ExecutionFlowControlTest

org.drools.compiler.integrationtests.FirstOrderLogicTest

org.drools.compiler.integrationtests.KnowledgeBuilderTest

org.drools.compiler.integrationtests.LargeRuleBase

org.drools.compiler.integrationtests.LargeRuleBaseSerializationTest

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