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.

     */
    @Test
    public void testSignedSerialization4() throws Exception {


        //Compile a package
        PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "../test_Dynamic1_0.drl" ) ) );


        // Create a rulebase
        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( builder.getPackage() );


        // Test rulebase serialization/deserialization
        byte[] serializedRulebase = DroolsStreamUtils.streamOut( ruleBase );


        try {

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                     "   Board() " +
                     "then \n" +
                     " System.err.println(42); \n" +
                     "end\n";


        PackageBuilder builder = new PackageBuilder( new PackageBuilderConfiguration( loader ) );
        builder.addPackageFromDrl( new StringReader( drl ) );
        assertFalse( builder.hasErrors() );


        Package p = builder.getPackage();
        byte[] ser = DroolsStreamUtils.streamOut( p );


        //now read it back
        Package p_ = (Package) DroolsStreamUtils.streamIn( ser,
                                                           loader );

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        rule += "when\n";
        rule += "then\n";
        rule += "    list.add( \"fired\" );\n";
        rule += "end";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule ) );
        assertTrue( builder.getErrors().isEmpty() );
        final Package pkg = builder.getPackage();


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );


        // Make sure the rete node map is created correctly

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        rule2 += "when\n";
        rule2 += "then\n";
        rule2 += "    list.add( \"fired2\" );\n";
        rule2 += "end";


        PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule1 ) );
        Package pkg = builder.getPackage();


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );


        // Make sure the rete node map is created correctly
        Map<Integer, BaseNode> nodes = RuleBaseNodes.getNodeMap( (InternalRuleBase) ruleBase );
        assertEquals( 2,
                      nodes.size() );
        assertEquals( "InitialFactImpl",
                      ((ClassObjectType) ((ObjectTypeNode) nodes.get( 2 )).getObjectType()).getClassType().getSimpleName() );
        assertEquals( "Rule 1",
                      ((RuleTerminalNode) nodes.get( 4 )).getRule().getName() );


        StatefulSession session = ruleBase.newStatefulSession();


        List list = new ArrayList();
        session.setGlobal( "list",
                           list );
        StatefulSession session1 = getSerialisedStatefulSession( session );
        session1.fireAllRules();


        assertEquals( 1,
                      ((List) session1.getGlobal( "list" )).size() );


        WorkingMemory session2 = getSerialisedStatefulSession( session1,
                                                               true );


        session.dispose();
        session1.dispose();


        builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule2 ) );
        pkg = builder.getPackage();


        ruleBase.addPackage( pkg );
        session2.fireAllRules();
        System.out.println(session2.getGlobal( "list" ));

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        rule += "    $p : Person( ) \n";
        rule += "then\n";
        rule += "    list.add( $p );\n";
        rule += "end";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule ) );
        final Package pkg = builder.getPackage();


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );


        // Make sure the rete node map is created correctly

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        rule += "    $p : Person( cheese == $c ) \n";
        rule += "then\n";
        rule += "    list.add( $p );\n";
        rule += "end";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule ) );
        final Package pkg = builder.getPackage();


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );


        // Make sure the rete node map is created correctly

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        rule3 += "then\n";
        rule3 += "    list.add( $c );\n";
        rule3 += "    drools.halt();\n";
        rule3 += "end";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule1 ) );
        builder.addPackageFromDrl( new StringReader( rule2 ) );
        builder.addPackageFromDrl( new StringReader( rule3 ) );
        final Package pkg = builder.getPackage();


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );


        StatefulSession session = ruleBase.newStatefulSession();

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        rule2 += "        insertLogical( person );\n";
        rule2 += "    }\n" +
                 "    drools.halt();\n";
        rule2 += "end\n";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( header + rule1 ) );
        builder.addPackageFromDrl( new StringReader( header + rule2 ) );
        final Package pkg = builder.getPackage();


        final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );


        StatefulSession session = ruleBase.newStatefulSession();

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        rule4 += "then\n";
        rule4 += "    list.add( \"rule4\" );\n";
        rule4 += "    drools.halt();\n";
        rule4 += "end";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule1 ) );
        builder.addPackageFromDrl( new StringReader( rule2 ) );
        builder.addPackageFromDrl( new StringReader( rule3 ) );
        builder.addPackageFromDrl( new StringReader( rule4 ) );


        final Package pkg = builder.getPackage();


        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );
        StatefulSession session = ruleBase.newStatefulSession();

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        rule4 += "then\n";
        rule4 += "    list.add( \"rule4\" );\n";
        rule4 += "    drools.halt();\n";
        rule4 += "end";


        final PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( rule1 ) );
        builder.addPackageFromDrl( new StringReader( rule2 ) );
        builder.addPackageFromDrl( new StringReader( rule3 ) );
        builder.addPackageFromDrl( new StringReader( rule4 ) );


        final Package pkg = builder.getPackage();


        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );
        StatefulSession session = 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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