Examples with ReteEvaluator org.drools.core.common.ReteEvaluator used on opensource projects

Example 21 with ReteEvaluator

use of org.drools.core.common.ReteEvaluator in project drools by kiegroup.

the class FieldConstraintTest method testPredicateConstraint.

/**
 * <pre>
 *
 *                (Cheese (price ?price1 )
 *                (Cheese (price ?price2&amp;:(= ?price2 (* 2 ?price1) )
 *
 * </pre>
 */
@Test
public void testPredicateConstraint() {
    InternalKnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase();
    ;
    StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
    final InternalReadAccessor priceExtractor = store.getReader(Cheese.class, "price");
    Pattern pattern = new Pattern(0, new ClassObjectType(Cheese.class));
    // Bind the extractor to a decleration
    // Declarations know the pattern they derive their value form
    final Declaration price1Declaration = new Declaration("price1", priceExtractor, pattern);
    pattern = new Pattern(1, new ClassObjectType(Cheese.class));
    // Bind the extractor to a decleration
    // Declarations know the pattern they derive their value form
    final Declaration price2Declaration = new Declaration("price2", priceExtractor, pattern);
    final PredicateExpression evaluator = new PredicateExpression() {

        private static final long serialVersionUID = 510l;

        public boolean evaluate(InternalFactHandle handle, Tuple tuple, Declaration[] previousDeclarations, Declaration[] localDeclarations, ReteEvaluator reteEvaluator, Object context) {
            int price1 = previousDeclarations[0].getIntValue(reteEvaluator, tuple.getObject(previousDeclarations[0]));
            int price2 = localDeclarations[0].getIntValue(reteEvaluator, handle.getObject());
            return (price2 == (price1 * 2));
        }

        public Object createContext() {
            return null;
        }

        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        }

        public void writeExternal(ObjectOutput out) throws IOException {
        }
    };
    final PredicateConstraint constraint1 = new PredicateConstraint(evaluator, new Declaration[] { price1Declaration }, new Declaration[] { price2Declaration });
    final Cheese cheddar0 = new Cheese("cheddar", 5);
    final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar0);
    LeftTupleImpl tuple = new LeftTupleImpl(f0, null, true);
    final Cheese cheddar1 = new Cheese("cheddar", 10);
    final InternalFactHandle f1 = (InternalFactHandle) ksession.insert(cheddar1);
    tuple = new LeftTupleImpl(tuple, new RightTupleImpl(f1, null), null, true);
    final PredicateContextEntry context = (PredicateContextEntry) constraint1.createContextEntry();
    context.updateFromTuple(ksession, tuple);
    assertTrue(constraint1.isAllowedCachedLeft(context, f1));
}

Example 22 with ReteEvaluator

use of org.drools.core.common.ReteEvaluator in project drools by kiegroup.

the class KnowledgeBaseEventSupportTest method setUp.

/* (non-Javadoc)
     * @see junit.framework.TestCase#setUp()
     */
@Before
public void setUp() throws Exception {
    kbase = KnowledgeBaseFactory.newKnowledgeBase();
    listener1 = new TestRuleBaseListener("(listener-1) ");
    listener2 = new TestRuleBaseListener("(listener-2) ");
    kbase.addEventListener(listener1);
    kbase.addEventListener(listener2);
    final RuleImpl rule1 = new RuleImpl("test1");
    final ClassObjectType cheeseObjectType = new ClassObjectType(Cheese.class);
    final Pattern pattern = new Pattern(0, cheeseObjectType);
    ClassFieldAccessorStore store = new ClassFieldAccessorStore();
    store.setClassFieldAccessorCache(new ClassFieldAccessorCache(Thread.currentThread().getContextClassLoader()));
    store.setEagerWire(true);
    AlphaNodeFieldConstraint constraint = ConstraintTestUtil.createCheeseTypeEqualsConstraint(store, "cheddar", useLambdaConstraint);
    pattern.addConstraint(constraint);
    rule1.addPattern(pattern);
    rule1.setConsequence(new Consequence() {

        private static final long serialVersionUID = 510l;

        public void evaluate(final KnowledgeHelper knowledgeHelper, final ReteEvaluator reteEvaluator) throws Exception {
        }

        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        }

        public void writeExternal(ObjectOutput out) throws IOException {
        }

        public String getName() {
            return "default";
        }
    });
    final RuleImpl rule2 = new RuleImpl("test2");
    final ClassObjectType cheeseObjectType2 = new ClassObjectType(Cheese.class);
    final Pattern pattern2 = new Pattern(0, cheeseObjectType2);
    AlphaNodeFieldConstraint constraint2 = ConstraintTestUtil.createCheeseTypeEqualsConstraint(store, "stilton", useLambdaConstraint);
    pattern2.addConstraint(constraint2);
    rule2.addPattern(pattern2);
    rule2.setConsequence(new Consequence() {

        private static final long serialVersionUID = 510l;

        public void evaluate(final KnowledgeHelper knowledgeHelper, final ReteEvaluator reteEvaluator) throws Exception {
        }

        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        }

        public void writeExternal(ObjectOutput out) throws IOException {
        }

        public String getName() {
            return "default";
        }
    });
    pkg = CoreComponentFactory.get().createKnowledgePackage("org.drools.test1");
    pkg.addRule(rule1);
    pkg.addRule(rule2);
}