Examples of org.drools.core.reteoo.Rete

org.drools.core.reteoo.Rete
The Rete-OO network. The Rete class is the root Object. All objects are asserted into the Rete node where it propagates to all matching ObjectTypeNodes. The first time an instance of a Class type is asserted it does a full iteration of all ObjectTyppeNodes looking for matches, any matches are then cached in a HashMap which is used for future assertions. While Rete extends ObjectSource nad implements ObjectSink it nulls the methods attach(), remove() and updateNewNode() as this is the root node they are no applicable @see ObjectTypeNode


        final ReteooRuleBase ruleBase = (ReteooRuleBase) RuleBaseFactory.newRuleBase();
        final AbstractWorkingMemory workingMemory = new AbstractWorkingMemory(1,
                                                                              ruleBase);


        final Rete source = ruleBase.getRete();


        final EntryPointNode entryPoint = new EntryPointNode(0,
                                                             source,
                                                             buildContext);
        entryPoint.attach(buildContext);

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        ReteooRuleBase ruleBase = (ReteooRuleBase) RuleBaseFactory.newRuleBase();
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();
        final AbstractWorkingMemory workingMemory = (AbstractWorkingMemory) ruleBase.newStatefulSession();


        final Rete source = ruleBase.getRete();


        final EntryPointNode entryPoint = new EntryPointNode(0,
                                                             source,
                                                             buildContext);
        entryPoint.attach(buildContext);

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        // create a RuleBase with a single ObjectTypeNode we attach a
        // MockObjectSink so we can detect assertions and retractions
        final Rule rule1 = new Rule( "test-rule1" );
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode( idGenerator.getNextId(),
                                                                  this.entryPoint,
                                                                  new ClassObjectType( String.class ),
                                                                  buildContext );
        objectTypeNode.attach( buildContext );

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        // create a RuleBase with a single ObjectTypeNode we attach a
        // MockObjectSink so we can detect assertions and retractions
        final Rule rule1 = new Rule( "test-rule1" );
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode( idGenerator.getNextId(),
                                                                  this.entryPoint,
                                                                  new ClassObjectType( String.class ),
                                                                  buildContext );
        objectTypeNode.attach( buildContext );

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    @Test
    @Ignore
    public void testSingleLogicalRelationship() throws Exception {
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();
        // create a RuleBase with a single ObjectTypeNode we attach a
        // MockObjectSink so we can detect assertions and retractions
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode(idGenerator.getNextId(),
                                                                 this.entryPoint,
                                                                 new ClassObjectType(String.class),

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        // MockObjectSink so w can detect assertions and retractions
        final Rule rule1 = new Rule( "test-rule1" );


        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode( idGenerator.getNextId(),
                                                                  this.entryPoint,
                                                                  new ClassObjectType( String.class ),
                                                                  buildContext );
        objectTypeNode.attach( buildContext );

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        // create a RuleBase with a single ObjectTypeNode we attach a
        // MockObjectSink so we can detect assertions and retractions
        final Rule rule1 = new Rule( "test-rule1" );
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode( idGenerator.getNextId(),
                                                                  this.entryPoint,
                                                                  new ClassObjectType( String.class ),
                                                                  buildContext );
        objectTypeNode.attach( buildContext );

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        // create a RuleBase with a single ObjectTypeNode we attach a
        // MockObjectSink so we can detect assertions and retractions
        final Rule rule1 = new Rule( "test-rule1" );
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode( idGenerator.getNextId(),
                                                                  this.entryPoint,
                                                                  new ClassObjectType( String.class ),
                                                                  buildContext );
        objectTypeNode.attach( buildContext );

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    @Test
    public void testMultipleLogicalRelationships() throws FactException {
        final Rule rule1 = new Rule( "test-rule1" );
        IdGenerator idGenerator = ruleBase.getReteooBuilder().getIdGenerator();


        final Rete rete = ruleBase.getRete();


        // Create a RuleBase with a single ObjectTypeNode we attach a
        // MockObjectSink so we can detect assertions and retractions
        final ObjectTypeNode objectTypeNode = new ObjectTypeNode( idGenerator.getNextId(),
                                                                  this.entryPoint,

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        // force gc
        GarbageCollector gc = ((InternalAgenda) ksession.getAgenda()).getGarbageCollector();
        assertEquals(10, gc.getDeleteCounter());
        gc.forceGcUnlinkedRules();


        Rete rete = ((KnowledgeBaseImpl)kbase).getRete();
        JoinNode joinNode = null;
        for (ObjectTypeNode otn : rete.getObjectTypeNodes()) {
            if ( Integer.class == otn.getObjectType().getValueType().getClassType() ) {
                joinNode = (JoinNode)otn.getSinkPropagator().getSinks()[0];
                break;
            }
        }

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