Examples with Consequence org.drools.core.spi.Consequence used on opensource projects

Example 6 with Consequence

use of org.drools.core.spi.Consequence in project drools by kiegroup.

the class BaseMannersTest method getAreWeDone.

/**
 * <pre>
 * rule areWeDone() {
 *     Context context; LastSeat lastSear;
 *     when {
 *         context : Context( state == Context.CHECK_DONE )
 *         LastSeat( lastSeat: seat )
 *         Seating( rightSeat == lastSeat )
 *     } then {
 *         context.setState(Context.PRINT_RESULTS );
 *     }
 * }
 * </pre>
 *
 * @return
 * @throws InvalidRuleException
 */
private RuleImpl getAreWeDone() throws InvalidRuleException {
    final RuleImpl rule = new RuleImpl("areWeDone");
    // -----------
    // context : Context( state == Context.CHECK_DONE )
    // -----------
    final Pattern contextPattern = new Pattern(0, this.contextType, "context");
    contextPattern.addConstraint(getLiteralConstraint(contextPattern, "state", Context.CHECK_DONE));
    rule.addPattern(contextPattern);
    final Declaration contextDeclaration = rule.getDeclaration("context");
    // ---------------
    // LastSeat( lastSeat: seat )
    // ---------------
    final Pattern lastSeatPattern = new Pattern(1, this.lastSeatType);
    setFieldDeclaration(lastSeatPattern, "seat", "lastSeat");
    rule.addPattern(lastSeatPattern);
    final Declaration lastSeatDeclaration = rule.getDeclaration("lastSeat");
    // -------------
    // Seating( rightSeat == lastSeat )
    // -------------
    final Pattern seatingPattern = new Pattern(2, this.seatingType, null);
    seatingPattern.addConstraint(getBoundVariableConstraint(seatingPattern, "rightSeat", lastSeatDeclaration, "=="));
    rule.addPattern(seatingPattern);
    // ------------
    // context.setName( Context.PRINT_RESULTS );
    // ------------
    final Consequence consequence = new Consequence() {

        public void evaluate(KnowledgeHelper drools, WorkingMemory workingMemory) throws ConsequenceException {
            try {
                RuleImpl rule = drools.getRule();
                LeftTuple tuple = (LeftTuple) drools.getTuple();
                Context context = (Context) drools.get(contextDeclaration);
                context.setState(Context.PRINT_RESULTS);
                drools.update(tuple.get(contextDeclaration), context);
            // System.err.println( "We Are Done!!!" );
            } catch (Exception e) {
                throw new ConsequenceException(e);
            }
        }

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

        public void writeExternal(ObjectOutput out) throws IOException {
        }

        public String getName() {
            return "default";
        }
    };
    rule.setConsequence(consequence);
    return rule;
}

Example 7 with Consequence

use of org.drools.core.spi.Consequence in project drools by kiegroup.

the class CrossProductTest method setUp.

@Before
public void setUp() throws Exception {
    final ObjectType list1ObjectType = new ClassObjectType(String.class);
    final ObjectType list2ObjectType = new ClassObjectType(String.class);
    final RuleImpl rule = new RuleImpl("rule-1");
    final Pattern list1Pattern = new Pattern(0, list1ObjectType, "s1");
    final Pattern list2Pattern = new Pattern(1, list2ObjectType, "s2");
    rule.addPattern(list1Pattern);
    rule.addPattern(list2Pattern);
    final Declaration s1Declaration = rule.getDeclaration("s1");
    final Declaration s2Declaration = rule.getDeclaration("s2");
    this.values = new ArrayList();
    rule.setConsequence(new Consequence() {

        private static final long serialVersionUID = 510l;

        public void evaluate(final KnowledgeHelper knowledgeHelper, final WorkingMemory workingMemory) throws Exception {
            final String s1 = (String) knowledgeHelper.get(s1Declaration);
            final String s2 = (String) knowledgeHelper.get(s2Declaration);
            CrossProductTest.this.values.add(new String[] { s1, s2 });
        }

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

        public void writeExternal(ObjectOutput out) throws IOException {
        }

        public String getName() {
            return "default";
        }
    });
    this.pkg = new KnowledgePackageImpl("org.drools");
    this.pkg.addRule(rule);
}

Example 8 with Consequence

use of org.drools.core.spi.Consequence in project drools by kiegroup.

the class ReteooRuleBuilderTest method testAddRuleWithPatterns.

@Test
public void testAddRuleWithPatterns() {
    final RuleImpl rule = new RuleImpl("only patterns");
    final Pattern c1 = new Pattern(0, new ClassObjectType(String.class));
    final Pattern c2 = new Pattern(1, new ClassObjectType(String.class));
    final Pattern c3 = new Pattern(2, new ClassObjectType(String.class));
    final GroupElement lhsroot = GroupElementFactory.newAndInstance();
    lhsroot.addChild(c1);
    lhsroot.addChild(c2);
    lhsroot.addChild(c3);
    rule.setLhs(lhsroot);
    final Consequence consequence = new Consequence() {

        public void evaluate(KnowledgeHelper knowledgeHelper, WorkingMemory workingMemory) throws Exception {
            System.out.println("Consequence!");
        }

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

        public void writeExternal(ObjectOutput out) throws IOException {
        }

        public String getName() {
            return "default";
        }
    };
    rule.setConsequence(consequence);
    final List terminals = this.builder.addRule(rule, this.rulebase);
    assertEquals("Rule must have a single terminal node", 1, terminals.size());
    final RuleTerminalNode terminal = (RuleTerminalNode) terminals.get(0);
}

Example 9 with Consequence

use of org.drools.core.spi.Consequence in project drools by kiegroup.

the class ASMConsequenceStubBuilder method createStubConsequence.

private void createStubConsequence(final ClassGenerator generator, final InvokerDataProvider data, final Map<String, Object> vars) {
    generator.setInterfaces(ConsequenceStub.class, CompiledInvoker.class).addField(ACC_PRIVATE + ACC_VOLATILE, "consequence", Consequence.class);
    generator.addMethod(ACC_PUBLIC, "getName", generator.methodDescr(String.class), new ClassGenerator.MethodBody() {

        public void body(MethodVisitor mv) {
            push((String) vars.get("consequenceName"));
            // return the first object on the stack
            mv.visitInsn(ARETURN);
        }
    }).addMethod(ACC_PUBLIC, "getNotPatterns", generator.methodDescr(Boolean[].class), new ClassGenerator.MethodBody() {

        public void body(MethodVisitor mv) {
            returnAsArray((Boolean[]) vars.get("notPatterns"));
        }
    }).addMethod(ACC_PUBLIC, "evaluate", generator.methodDescr(null, KnowledgeHelper.class, WorkingMemory.class), new String[] { "java/lang/Exception" }, new ClassGenerator.MethodBody() {

        public void body(MethodVisitor mv) {
            Label syncStart = new Label();
            Label syncEnd = new Label();
            Label l1 = new Label();
            Label l2 = new Label();
            mv.visitTryCatchBlock(syncStart, l1, l2, null);
            Label l3 = new Label();
            mv.visitTryCatchBlock(l2, l3, l2, null);
            getFieldFromThis("consequence", Consequence.class);
            mv.visitJumpInsn(IFNONNULL, syncEnd);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitInsn(DUP);
            mv.visitVarInsn(ASTORE, 3);
            // synchronized(this) {
            mv.visitInsn(MONITORENTER);
            mv.visitLabel(syncStart);
            getFieldFromThis("consequence", Consequence.class);
            // if (consequence == null) ...
            Label ifNotInitialized = new Label();
            mv.visitJumpInsn(IFNONNULL, ifNotInitialized);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);
            // ... ConsequenceGenerator.generate(this, knowledgeHelper, workingMemory)
            invokeStatic(ConsequenceGenerator.class, "generate", null, ConsequenceStub.class, KnowledgeHelper.class, WorkingMemory.class);
            mv.visitLabel(ifNotInitialized);
            mv.visitVarInsn(ALOAD, 3);
            mv.visitInsn(MONITOREXIT);
            mv.visitLabel(l1);
            mv.visitJumpInsn(GOTO, syncEnd);
            mv.visitLabel(l2);
            mv.visitVarInsn(ASTORE, 4);
            mv.visitVarInsn(ALOAD, 3);
            mv.visitInsn(MONITOREXIT);
            mv.visitLabel(l3);
            mv.visitVarInsn(ALOAD, 4);
            mv.visitInsn(ATHROW);
            mv.visitLabel(syncEnd);
            // } end of synchronized
            getFieldFromThis("consequence", Consequence.class);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);
            invokeInterface(Consequence.class, "evaluate", null, KnowledgeHelper.class, WorkingMemory.class);
            mv.visitInsn(RETURN);
        }
    }).addMethod(ACC_PUBLIC, "setConsequence", generator.methodDescr(null, Consequence.class), new ClassGenerator.MethodBody() {

        public void body(MethodVisitor mv) {
            putFieldInThisFromRegistry("consequence", Consequence.class, 1);
            mv.visitInsn(RETURN);
        }
    });
}

Example 10 with Consequence

use of org.drools.core.spi.Consequence in project drools by kiegroup.

the class MVELConsequence method evaluate.

@Override
public void evaluate(KnowledgeHelper knowledgeHelper, WorkingMemory workingMemory) throws Exception {
    // same as lambda consequence...
    Tuple tuple = knowledgeHelper.getTuple();
    Declaration[] declarations = ((RuleTerminalNode) knowledgeHelper.getMatch().getTuple().getTupleSink()).getRequiredDeclarations();
    Variable[] vars = consequence.getVariables();
    // ...but the facts are association of Variable and its value, preserving order.
    Map<Variable, Object> facts = new LinkedHashMap<>();
    int declrCounter = 0;
    for (Variable var : vars) {
        if (var.isFact()) {
            Declaration declaration = declarations[declrCounter++];
            InternalFactHandle fh = tuple.get(declaration);
            facts.put(var, declaration.getValue((InternalWorkingMemory) workingMemory, fh.getObject()));
        } else {
            facts.put(var, workingMemory.getGlobal(var.getName()));
        }
    }
    ScriptBlock scriptBlock = null;
    try {
        scriptBlock = (ScriptBlock) consequence.getBlock();
    } catch (ClassCastException e) {
        throw new RuntimeException("I tried to access a ScriptBlock but it was not. So something is thinking is a MVEL consequence but did not set the MVEL script textual representation", e);
    }
    String originalRHS = scriptBlock.getScript();
    String name = context.getRule().getPackageName() + "." + context.getRule().getName();
    String expression = MVELConsequenceBuilder.processMacros(originalRHS);
    String[] globalIdentifiers = new String[] {};
    String[] default_inputIdentifiers = new String[] { "this", "drools", "kcontext", "rule" };
    String[] inputIdentifiers = Stream.concat(Arrays.asList(default_inputIdentifiers).stream(), facts.entrySet().stream().map(kv -> kv.getKey().getName())).collect(Collectors.toList()).toArray(new String[] {});
    String[] default_inputTypes = new String[] { "org.drools.core.spi.KnowledgeHelper", "org.drools.core.spi.KnowledgeHelper", "org.drools.core.spi.KnowledgeHelper", "org.kie.api.definition.rule.Rule" };
    String[] inputTypes = Stream.concat(Arrays.asList(default_inputTypes).stream(), facts.entrySet().stream().map(kv -> kv.getKey().getType().getName())).collect(Collectors.toList()).toArray(new String[] {});
    // ^^ please notice about inputTypes, it is to use the Class.getName(), because is later used by the Classloader internally in MVEL to load the class,
    // do NOT replace with getCanonicalName() otherwise inner classes will not be loaded correctly.
    int languageLevel = 4;
    boolean strictMode = true;
    boolean readLocalsFromTuple = false;
    EvaluatorWrapper[] operators = new EvaluatorWrapper[] {};
    Declaration[] previousDeclarations = new Declaration[] {};
    Declaration[] localDeclarations = new Declaration[] {};
    String[] otherIdentifiers = new String[] {};
    MVELCompilationUnit cu = new MVELCompilationUnit(name, expression, globalIdentifiers, operators, previousDeclarations, localDeclarations, otherIdentifiers, inputIdentifiers, inputTypes, languageLevel, strictMode, readLocalsFromTuple);
    // TODO unfortunately the MVELDialectRuntimeData would be the one of compile time
    // the one from runtime is not helpful, in fact the dialect registry for runtime is empty:
    // MVELDialectRuntimeData runtimeData = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
    MVELDialectRuntimeData runtimeData = new MVELDialectRuntimeData();
    // this classloader will be used by the CompilationUnit to load the imports.
    runtimeData.onAdd(null, Thread.currentThread().getContextClassLoader());
    runtimeData.addPackageImport(context.getPkg().getName());
    runtimeData.addPackageImport("java.lang");
    // therefore we assume for the ScriptBlock all available KBPackages are the default available and imported for the scope of the Script itself.
    for (KiePackage kp : context.getKnowledgePackages()) {
        if (!kp.getName().equals(context.getPkg().getName())) {
            runtimeData.addPackageImport(kp.getName());
        }
    }
    // sometimes here it was passed as a 2nd argument a String?? similar to `rule R in file file.drl`
    Serializable cuResult = cu.getCompiledExpression(runtimeData);
    ExecutableStatement compiledExpression = (ExecutableStatement) cuResult;
    // TODO the part above up to the ExecutableStatement compiledExpression should be cached.
    Map<String, Object> mvelContext = new HashMap<>();
    mvelContext.put("this", knowledgeHelper);
    mvelContext.put("drools", knowledgeHelper);
    mvelContext.put("kcontext", knowledgeHelper);
    mvelContext.put("rule", knowledgeHelper.getRule());
    for (Entry<Variable, Object> kv : facts.entrySet()) {
        mvelContext.put(kv.getKey().getName(), kv.getValue());
    }
    CachingMapVariableResolverFactory cachingFactory = new CachingMapVariableResolverFactory(mvelContext);
    VariableResolverFactory factory = cu.getFactory(knowledgeHelper, ((AgendaItem) knowledgeHelper.getMatch()).getTerminalNode().getRequiredDeclarations(), knowledgeHelper.getRule(), knowledgeHelper.getTuple(), null, (InternalWorkingMemory) workingMemory, workingMemory.getGlobalResolver());
    cachingFactory.setNextFactory(factory);
    MVEL.executeExpression(compiledExpression, knowledgeHelper, cachingFactory);
}