Examples of org.drools.builder.KnowledgeBuilderConfiguration

org.drools.builder.KnowledgeBuilderConfiguration
This class configures the knowledge package builder and compiler. Dialects and their DialectConfigurations are handled by the DialectRegistry Normally you will not need to look at this class, unless you want to override the defaults.

This class will automatically load default values from a number of places, accumulating properties from each location. This list of locations, in given priority is: System properties, home directory, working directory, META-INF/ of optionally provided classLoader META-INF/ of Thread.currentThread().getContextClassLoader() and META-INF/ of ClassLoader.getSystemClassLoader()

So if you want to set a default configuration value for all your new KnowledgeBuilder, you can simply set the property as a System property.

This class is not thread safe and it also contains state. After the KnowledgeBuilder is created, it makes the configuration immutable and there is no way to make it mutable again. This is to avoid inconsistent behaviour inside KnowledgeBuilder.
- drools.dialect.default = <String>
- drools.accumulate.function.<function name> = <qualified class>
- drools.evaluator. = <qualified class>
- drools.dump.dir = <String>
- drools.parser.processStringEscapes = <true|false>
Two dialects are supported, Java and MVEL. Java is the default dialect.
The Java dialect supports the following configurations:
- drools.dialect.java.compiler = <ECLIPSE|JANINO>
- drools.dialect.java.lngLevel = <1.5|1.6>
And MVEL supports the following configurations:
- drools.dialect.mvel.strict = <true|false>
So for example if we wanted to create a new KnowledgeBuilder that used Janino as the default compiler we would do the following:
```
 KnowledgeBuilderConfiguration config = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(); config.setProperty("drools.dialect.java.compiler", "JANINO"); KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( config ); 
```
Remember the KnowledgeBuilderConfiguration could have taken a Properties instance with that setting in it at constructor time, or it could also discover from a disk based properties file too.

Available pre-configured Accumulate functions are:
- drools.accumulate.function.average = org.drools.base.accumulators.AverageAccumulateFunction
- drools.accumulate.function.max = org.drools.base.accumulators.MaxAccumulateFunction
- drools.accumulate.function.min = org.drools.base.accumulators.MinAccumulateFunction
- drools.accumulate.function.count = org.drools.base.accumulators.CountAccumulateFunction
- drools.accumulate.function.sum = org.drools.base.accumulators.SumAccumulateFunction
- drools.accumulate.function.collectSet = org.drools.base.accumulators.CollectSetAccumulateFunction
- drools.accumulate.function.collectList = org.drools.base.accumulators.CollectListAccumulateFunction


    private void updateRuleBase() throws Exception {


        verifierKnowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();


        KnowledgeBuilderConfiguration kbuilderConfiguration = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
        kbuilderConfiguration.setProperty( "drools.dialect.java.compiler",
                                           "JANINO" );


        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( kbuilderConfiguration );


        if ( conf.getVerifyingResources() != null ) {

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        //Stop monitoring resources
        kagent.monitorResourceChangeEvents(false);


        //Now we create a new kagent, but passing a custom KnowledgeBuilderConfiguration
        //having the correct classloader
        KnowledgeBuilderConfiguration kbuilderConfig =
                KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null, ucl);
        kagent = this.createKAgent(kbase, newInstance, false, kbuilderConfig);


        //The agent processes the changeset. The rule should be compiled
        //succesfully

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        //Stop monitoring resources
        kagent.monitorResourceChangeEvents(false);


        //Create a kagent with the kbase and using useKBaseClassLoaderForCompiling.
        //The kbase's classloader should be used for compilation too
        KnowledgeBuilderConfiguration kbuilderConfig =
                KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null, ucl);
        kagent = this.createKAgent(kbase, newInstance, true, kbuilderConfig);


        //The agent processes the changeset. The rule should be compiled
        //succesfully

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        session.fireAllRules();
    }


    @Test
    public void testClassLoaderHits() throws Exception {
        final KnowledgeBuilderConfiguration conf = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
        //conf.setOption( ClassLoaderCacheOption.DISABLED );
        final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( conf );
        kbuilder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_GeneratedBeansMVEL.drl" ) ),
                      ResourceType.DRL );
        kbuilder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_GeneratedBeans.drl" ) ),

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        // XXX: Fails here, this worked in revision 30833
        ksession.insert( new Pet( "Toni" ) );
    }


    public void testClassLoaderHits() throws Exception {
        final KnowledgeBuilderConfiguration conf = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
        //conf.setOption( ClassLoaderCacheOption.DISABLED );
        final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( conf );
        kbuilder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_GeneratedBeansMVEL.drl" ) ),
                      ResourceType.DRL );
        kbuilder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_GeneratedBeans.drl" ) ),

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        session.fireAllRules();
    }


    @Test
    public void testClassLoaderHits() throws Exception {
        final KnowledgeBuilderConfiguration conf = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
        //conf.setOption( ClassLoaderCacheOption.DISABLED );
        final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( conf );
        kbuilder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_GeneratedBeansMVEL.drl" ) ),
                      ResourceType.DRL );
        kbuilder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_GeneratedBeans.drl" ) ),

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        //Stop monitoring resources
        kagent.monitorResourceChangeEvents(false);


        //Now we create a new kagent, but passing a custom KnowledgeBuilderConfiguration
        //having the correct classloader
        KnowledgeBuilderConfiguration kbuilderConfig =
                KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null, ucl);
        kagent = this.createKAgent(kbase, newInstance, false, kbuilderConfig);


        //The agent processes the changeset. The rule should be compiled
        //succesfully

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        //Stop monitoring resources
        kagent.monitorResourceChangeEvents(false);


        //Create a kagent with the kbase and using useKBaseClassLoaderForCompiling.
        //The kbase's classloader should be used for compilation too
        KnowledgeBuilderConfiguration kbuilderConfig =
                KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null, ucl);
        kagent = this.createKAgent(kbase, newInstance, true, kbuilderConfig);


        //The agent processes the changeset. The rule should be compiled
        //succesfully

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    private KnowledgeBuilderConfiguration createKnowledgeBuilderConfiguration() {
        Properties properties = new Properties();
        properties.setProperty( "drools.dialect.java.compiler",
                                "JANINO" );
        KnowledgeBuilderConfiguration kconf = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration( properties,
                                                                                                        getClass().getClassLoader() );
        kconf.setOption( DefaultDialectOption.get( "java" ) );
        return kconf;
    }

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            // Creates first class loader and use it to load fact classes
            ClassLoader loader1 = new SubvertedClassLoader( new URL[]{getClass().getResource( "/testEnum.jar" )},
                                                            this.getClass().getClassLoader() );


            // create a builder with the given classloader
            KnowledgeBuilderConfiguration conf = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration( null,
                                                                                                           loader1 );
            KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder( conf );
            builder.add( ResourceFactory.newInputStreamResource( getClass().getResourceAsStream( "test_EnumSerialization.drl" ) ),
                         ResourceType.DRL );
            Collection<KnowledgePackage> pkgs = builder.getKnowledgePackages();
            KnowledgePackage pkg = pkgs.iterator().next();


            // serialize out
            byte[] out = DroolsStreamUtils.streamOut( ((KnowledgePackageImp) pkg).pkg );


            // adding original packages to a kbase just to make sure they are fine
            KnowledgeBaseConfiguration kbaseConf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration( null,
                                                                                                       loader1 );
            KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase( kbaseConf );
            kbase.addKnowledgePackages( pkgs );


            // now, create another classloader and make sure it has access to the classes
            ClassLoader loader2 = new SubvertedClassLoader( new URL[]{getClass().getResource( "/testEnum.jar" )},
                                                            this.getClass().getClassLoader() );


            // create another builder
            KnowledgeBuilderConfiguration conf2 = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration( null,
                                                                                                            loader2 );
            KnowledgeBuilder builder2 = KnowledgeBuilderFactory.newKnowledgeBuilder( conf2 );
            builder2.add( ResourceFactory.newByteArrayResource( out ),
                          ResourceType.PKG );
            Collection<KnowledgePackage> pkgs2 = builder2.getKnowledgePackages();

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