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

Example 16 with KnowledgeHelper

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

the class BaseMannersTest method getAssignFirstSeatRule.

/**
 * <pre>
 *    rule assignFirstSeat() {
 *        Context context;
 *        Guest guest;
 *        Count count;
 *        when {
 *            context : Context( state == Context.START_UP )
 *            guest : Guest()
 *            count : Count()
 *        } then {
 *            String guestName = guest.getName();
 *            drools.assert( new Seating( count.getValue(), 1, true, 1, guestName, 1, guestName) );
 *            drools.assert( new Path( count.getValue(), 1, guestName ) );
 *            count.setCount(  count.getValue() + 1 );
 *
 *            System.err.println( &quot;seat 1 &quot; + guest.getName() + &quot; );
 *
 *            context.setPath( Context.ASSIGN_SEATS );
 *        }
 *    }
 * </pre>
 *
 * @return
 * @throws InvalidRuleException
 */
private RuleImpl getAssignFirstSeatRule() throws InvalidRuleException {
    final RuleImpl rule = new RuleImpl("assignFirstSeat");
    // -----------
    // context : Context( state == Context.START_UP )
    // -----------
    final Pattern contextPattern = new Pattern(0, this.contextType, "context");
    contextPattern.addConstraint(getLiteralConstraint(contextPattern, "state", Context.START_UP));
    rule.addPattern(contextPattern);
    final Declaration contextDeclaration = rule.getDeclaration("context");
    // -----------
    // guest: Guest()
    // -----------
    final Pattern guestPattern = new Pattern(1, this.guestType, "guest");
    rule.addPattern(guestPattern);
    final Declaration guestDeclaration = rule.getDeclaration("guest");
    // ------------
    // count : Count()
    // ------------
    final Pattern countPattern = new Pattern(2, this.countType, "count");
    rule.addPattern(countPattern);
    final Declaration countDeclaration = rule.getDeclaration("count");
    final Consequence consequence = new Consequence() {

        public void evaluate(KnowledgeHelper drools, WorkingMemory workingMemory) throws ConsequenceException {
            try {
                RuleImpl rule = drools.getRule();
                LeftTuple tuple = (LeftTuple) drools.getTuple();
                Guest guest = (Guest) drools.get(guestDeclaration);
                Context context = (Context) drools.get(contextDeclaration);
                Count count = (Count) drools.get(countDeclaration);
                String guestName = guest.getName();
                Seating seating = new Seating(count.getValue(), 0, true, 1, guestName, 1, guestName);
                drools.insert(seating);
                Path path = new Path(count.getValue(), 1, guestName);
                drools.insert(path);
                count.setValue(count.getValue());
                drools.update(tuple.get(countDeclaration), count);
                context.setState(Context.ASSIGN_SEATS);
                // drools.update( tuple.get( contextDeclaration ),
                // context );
                drools.update(tuple.get(contextDeclaration));
            // System.err.println( "assign first seat :  " + seating + " : " + path );
            } catch (Exception e) {
                e.printStackTrace();
                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 17 with KnowledgeHelper

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

the class BaseMannersTest method getPathDone.

/**
 * <pre>
 * rule pathDone() {
 *     Context context; Seating seating;
 *     when {
 *         context : Context( state == Context.MAKE_PATH )
 *         seating : Seating( pathDone == false )
 *     } then {
 *         seating.setPathDone( true );
 *         context.setName( Context.CHECK_DONE );
 *     }
 * }
 * </pre>
 *
 * @return
 * @throws InvalidRuleException
 */
private RuleImpl getPathDone() throws InvalidRuleException {
    final RuleImpl rule = new RuleImpl("pathDone");
    // -----------
    // context : Context( state == Context.MAKE_PATH )
    // -----------
    final Pattern contextPattern = new Pattern(0, this.contextType, "context");
    contextPattern.addConstraint(getLiteralConstraint(contextPattern, "state", Context.MAKE_PATH));
    rule.addPattern(contextPattern);
    final Declaration contextDeclaration = rule.getDeclaration("context");
    // ---------------
    // seating : Seating( pathDone == false )
    // ---------------
    final Pattern seatingPattern = new Pattern(1, this.seatingType, "seating");
    seatingPattern.addConstraint(getLiteralConstraint(seatingPattern, "pathDone", false));
    rule.addPattern(seatingPattern);
    final Declaration seatingDeclaration = rule.getDeclaration("seating");
    // ------------
    // context.setName( Context.CHECK_DONE );
    // seating.setPathDone( true );
    // ------------
    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);
                Seating seating = (Seating) drools.get(seatingDeclaration);
                seating.setPathDone(true);
                // if ( seating.getId() == 6 ) {
                // System.err.println( "pause" );
                // }
                drools.update(tuple.get(seatingDeclaration));
                context.setState(Context.CHECK_DONE);
                drools.update(tuple.get(contextDeclaration), context);
            // System.err.println( "path done" + seating );
            } catch (Exception e) {
                e.printStackTrace();
                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 18 with KnowledgeHelper

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

the class BaseMannersTest method getFindSeating.

/**
 * <pre>
 *    rule findSeating() {
 *       Context context;
 *       int seatingId, seatingPid;
 *       String seatingRightGuestName, leftGuestName;
 *       Sex rightGuestSex;
 *       Hobby rightGuestHobby;
 *       Count count;
 *
 *       when {
 *           context : Context( state == Context.ASSIGN_SEATS )
 *           Seating( seatingId:id, seatingPid:pid, pathDone == true
 *                    seatingRightSeat:rightSeat seatingRightGuestName:rightGuestName )
 *           Guest( name == seatingRightGuestName, rightGuestSex:sex, rightGuestHobby:hobby )
 *           Guest( leftGuestName:name , sex != rightGuestSex, hobby == rightGuestHobby )
 *
 *           count : Count()
 *
 *           not ( Path( id == seatingId, guestName == leftGuestName) )
 *           not ( Chosen( id == seatingId, guestName == leftGuestName, hobby == rightGuestHobby) )
 *       } then {
 *           int newSeat = rightSeat + 1;
 *           drools.assert( new Seating( coung.getValue(), rightSeat, rightSeatName, leftGuestName, newSeat, countValue, id, false );
 *           drools.assert( new Path( countValue, leftGuestName, newSeat );
 *           drools.assert( new Chosen( id, leftGuestName, rightGuestHobby ) );
 *
 *           System.err.println( &quot;seat &quot; + rightSeat + &quot; &quot; + rightSeatName + &quot; &quot; + leftGuestName );
 *
 *           count.setCount(  countValue + 1 );
 *           context.setPath( Context.MAKE_PATH );
 *       }
 *    }
 * </pre>
 *
 * @return
 * @throws InvalidRuleException
 */
private RuleImpl getFindSeating() throws InvalidRuleException {
    final RuleImpl rule = new RuleImpl("findSeating");
    // ---------------
    // context : Context( state == Context.ASSIGN_SEATS )
    // ---------------
    final Pattern contextPattern = new Pattern(0, this.contextType, "context");
    contextPattern.addConstraint(getLiteralConstraint(contextPattern, "state", Context.ASSIGN_SEATS));
    rule.addPattern(contextPattern);
    final Declaration contextDeclaration = rule.getDeclaration("context");
    // -------------------------------
    // Seating( seatingId:id, seatingPid:pid, pathDone == true
    // seatingRightSeat:rightSeat seatingRightGuestName:rightGuestName )
    // -------------------------------
    final Pattern seatingPattern = new Pattern(1, this.seatingType);
    setFieldDeclaration(seatingPattern, "id", "seatingId");
    setFieldDeclaration(seatingPattern, "pid", "seatingPid");
    seatingPattern.addConstraint(getLiteralConstraint(seatingPattern, "pathDone", true));
    setFieldDeclaration(seatingPattern, "rightSeat", "seatingRightSeat");
    setFieldDeclaration(seatingPattern, "rightGuestName", "seatingRightGuestName");
    rule.addPattern(seatingPattern);
    final Declaration seatingIdDeclaration = rule.getDeclaration("seatingId");
    final Declaration seatingPidDeclaration = rule.getDeclaration("seatingPid");
    final Declaration seatingRightGuestNameDeclaration = rule.getDeclaration("seatingRightGuestName");
    final Declaration seatingRightSeatDeclaration = rule.getDeclaration("seatingRightSeat");
    // --------------
    // Guest( name == seatingRightGuestName, rightGuestSex:sex,
    // rightGuestHobby:hobby )
    // ---------------
    final Pattern rightGuestPattern = new Pattern(2, this.guestType);
    rightGuestPattern.addConstraint(getBoundVariableConstraint(rightGuestPattern, "name", seatingRightGuestNameDeclaration, "=="));
    setFieldDeclaration(rightGuestPattern, "sex", "rightGuestSex");
    setFieldDeclaration(rightGuestPattern, "hobby", "rightGuestHobby");
    rule.addPattern(rightGuestPattern);
    final Declaration rightGuestSexDeclaration = rule.getDeclaration("rightGuestSex");
    final Declaration rightGuestHobbyDeclaration = rule.getDeclaration("rightGuestHobby");
    // ----------------
    // Guest( leftGuestName:name , sex != rightGuestSex, hobby ==
    // rightGuestHobby )
    // ----------------
    final Pattern leftGuestPattern = new Pattern(3, this.guestType);
    setFieldDeclaration(leftGuestPattern, "name", "leftGuestName");
    leftGuestPattern.addConstraint(getBoundVariableConstraint(rightGuestPattern, "hobby", rightGuestHobbyDeclaration, "=="));
    leftGuestPattern.addConstraint(getBoundVariableConstraint(leftGuestPattern, "sex", rightGuestSexDeclaration, "!="));
    rule.addPattern(leftGuestPattern);
    final Declaration leftGuestNameDeclaration = rule.getDeclaration("leftGuestName");
    // ---------------
    // count : Count()
    // ---------------
    final Pattern count = new Pattern(4, this.countType, "count");
    rule.addPattern(count);
    final Declaration countDeclaration = rule.getDeclaration("count");
    // --------------
    // not ( Path( id == seatingId, guestName == leftGuestName) )
    // --------------
    final Pattern notPathPattern = new Pattern(5, this.pathType);
    notPathPattern.addConstraint(getBoundVariableConstraint(notPathPattern, "id", seatingIdDeclaration, "=="));
    notPathPattern.addConstraint(getBoundVariableConstraint(notPathPattern, "guestName", leftGuestNameDeclaration, "=="));
    final GroupElement notPath = GroupElementFactory.newNotInstance();
    notPath.addChild(notPathPattern);
    rule.addPattern(notPath);
    // ------------
    // not ( Chosen( id == seatingId, guestName == leftGuestName, hobby ==
    // rightGuestHobby ) )
    // ------------
    final Pattern notChosenPattern = new Pattern(6, this.chosenType);
    notChosenPattern.addConstraint(getBoundVariableConstraint(notChosenPattern, "id", seatingIdDeclaration, "=="));
    notChosenPattern.addConstraint(getBoundVariableConstraint(notChosenPattern, "guestName", leftGuestNameDeclaration, "=="));
    notChosenPattern.addConstraint(getBoundVariableConstraint(notChosenPattern, "hobby", rightGuestHobbyDeclaration, "=="));
    final GroupElement notChosen = GroupElementFactory.newNotInstance();
    notChosen.addChild(notChosenPattern);
    rule.addPattern(notChosen);
    // ------------
    // int newSeat = rightSeat + 1;
    // drools.assert( new Seating( coung.getValue(), rightSeat,
    // rightSeatName, leftGuestName, newSeat, countValue, id, false );
    // drools.assert( new Path( countValue, leftGuestName, newSeat );
    // drools.assert( new Chosen( id, leftGuestName, rightGuestHobby ) );
    // 
    // System.err.println( "seat " + rightSeat + " " + rightSeatName + " " +
    // leftGuestName );
    // 
    // count.setCount( countValue + 1 );
    // context.setPath( Context.MAKE_PATH );
    // ------------
    final Consequence consequence = new Consequence() {

        public void evaluate(KnowledgeHelper drools, WorkingMemory workingMemory) throws ConsequenceException {
            try {
                // MemoryVisitor visitor = new MemoryVisitor( ( InternalWorkingMemory ) workingMemory );
                // visitor.visit( workingMemory.getRuleBase() );
                RuleImpl rule = drools.getRule();
                LeftTuple tuple = (LeftTuple) drools.getTuple();
                Context context = (Context) drools.get(contextDeclaration);
                Count count = (Count) drools.get(countDeclaration);
                int seatId = seatingIdDeclaration.getExtractor().getIntValue((InternalWorkingMemory) workingMemory, tuple.get(seatingIdDeclaration).getObject());
                int seatingRightSeat = seatingRightSeatDeclaration.getExtractor().getIntValue((InternalWorkingMemory) workingMemory, tuple.get(seatingRightSeatDeclaration).getObject());
                String leftGuestName = (String) drools.get(leftGuestNameDeclaration);
                String rightGuestName = (String) drools.get(seatingRightGuestNameDeclaration);
                Hobby rightGuestHobby = (Hobby) drools.get(rightGuestHobbyDeclaration);
                Seating seating = new Seating(count.getValue(), seatId, false, seatingRightSeat, rightGuestName, seatingRightSeat + 1, leftGuestName);
                drools.insert(seating);
                Path path = new Path(count.getValue(), seatingRightSeat + 1, leftGuestName);
                drools.insert(path);
                Chosen chosen = new Chosen(seatId, leftGuestName, rightGuestHobby);
                drools.insert(chosen);
                count.setValue(count.getValue() + 1);
                // if ( count.getValue() == 5 ) {
                // drools.retractObject( tuple.getFactHandleForDeclaration( countDeclaration ) );
                // } else {
                // drools.update( tuple.getFactHandleForDeclaration( countDeclaration ),
                // count );
                // }
                drools.update(tuple.get(countDeclaration), count);
                context.setState(Context.MAKE_PATH);
                drools.update(tuple.get(contextDeclaration), context);
                System.err.println("find seating : " + seating + " : " + path + " : " + chosen);
            } catch (Exception e) {
                e.printStackTrace();
                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 19 with KnowledgeHelper

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

the class RuleExecutor method innerFireActivation.

private void innerFireActivation(InternalWorkingMemory wm, InternalAgenda agenda, Activation activation, Consequence consequence) {
    try {
        KnowledgeHelper knowledgeHelper = agenda.getKnowledgeHelper();
        knowledgeHelper.setActivation(activation);
        if (log.isTraceEnabled()) {
            log.trace("Fire event {} for rule \"{}\" \n{}", consequence.getName(), activation.getRule().getName(), activation.getTuple());
        }
        wm.getRuleEventSupport().onBeforeMatchFire(activation);
        consequence.evaluate(knowledgeHelper, wm);
        wm.getRuleEventSupport().onAfterMatchFire(activation);
        activation.setActive(false);
        knowledgeHelper.cancelRemainingPreviousLogicalDependencies();
        knowledgeHelper.reset();
    } catch (final Exception e) {
        agenda.handleException(wm, activation, e);
    } finally {
        if (activation.getActivationFactHandle() != null) {
            // update the Activation in the WM
            InternalFactHandle factHandle = activation.getActivationFactHandle();
            wm.getEntryPointNode().modifyActivation(factHandle, activation.getPropagationContext(), wm);
        }
    }
}

Example 20 with KnowledgeHelper

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

the class ConsequenceGenerator method generate.

public static void generate(final ConsequenceStub stub, KnowledgeHelper knowledgeHelper, WorkingMemory workingMemory) {
    RuleTerminalNode rtn = (RuleTerminalNode) knowledgeHelper.getMatch().getTuple().getTupleSink();
    final Declaration[] declarations = rtn.getRequiredDeclarations();
    final Tuple tuple = knowledgeHelper.getTuple();
    // Sort declarations based on their offset, so it can ascend the tuple's parents stack only once
    final List<DeclarationMatcher> declarationMatchers = matchDeclarationsToTuple(declarations);
    final ClassGenerator generator = createInvokerClassGenerator(stub, workingMemory).setInterfaces(Consequence.class, CompiledInvoker.class);
    generator.addMethod(ACC_PUBLIC, "getName", generator.methodDescr(String.class), new ClassGenerator.MethodBody() {

        public void body(MethodVisitor mv) {
            push(stub.getGeneratedInvokerClassName());
            mv.visitInsn(ARETURN);
        }
    }).addMethod(ACC_PUBLIC, "evaluate", generator.methodDescr(null, KnowledgeHelper.class, WorkingMemory.class), new String[] { "java/lang/Exception" }, new GeneratorHelper.EvaluateMethod() {

        public void body(MethodVisitor mv) {
            // Tuple tuple = knowledgeHelper.getTuple();
            mv.visitVarInsn(ALOAD, 1);
            invokeInterface(KnowledgeHelper.class, "getTuple", Tuple.class);
            cast(LeftTuple.class);
            // LeftTuple
            mv.visitVarInsn(ASTORE, 3);
            // Declaration[] declarations = ((RuleTerminalNode)knowledgeHelper.getMatch().getTuple().getTupleSink()).getDeclarations();
            mv.visitVarInsn(ALOAD, 1);
            invokeInterface(KnowledgeHelper.class, "getMatch", Activation.class);
            invokeInterface(Activation.class, "getTuple", Tuple.class);
            invokeInterface(Tuple.class, "getTupleSink", Sink.class);
            cast(RuleTerminalNode.class);
            invokeVirtual(RuleTerminalNode.class, "getRequiredDeclarations", Declaration[].class);
            mv.visitVarInsn(ASTORE, 4);
            Tuple currentTuple = tuple;
            // astore start position for objects to store in loop
            objAstorePos = 6;
            int[] paramsPos = new int[declarations.length];
            // declarationMatchers is already sorted by offset with tip declarations now first
            for (DeclarationMatcher matcher : declarationMatchers) {
                // original index refers to the array position with RuleTerminalNode.getDeclarations()
                int i = matcher.getOriginalIndex();
                int handlePos = objAstorePos;
                int objPos = ++objAstorePos;
                paramsPos[i] = handlePos;
                currentTuple = traverseTuplesUntilDeclaration(currentTuple, matcher.getRootDistance(), 3);
                // handle = tuple.getFactHandle()
                mv.visitVarInsn(ALOAD, 3);
                invokeInterface(Tuple.class, "getOriginalFactHandle", InternalFactHandle.class);
                mv.visitVarInsn(ASTORE, handlePos);
                String declarationType = declarations[i].getTypeName();
                if (stub.getNotPatterns()[i]) {
                    // notPattern indexes field declarations
                    // declarations[i].getValue((InternalWorkingMemory)workingMemory, fact[i].getObject());
                    // org.kie.rule.Declaration[]
                    mv.visitVarInsn(ALOAD, 4);
                    // i
                    push(i);
                    // declarations[i]
                    mv.visitInsn(AALOAD);
                    // WorkingMemory
                    mv.visitVarInsn(ALOAD, 2);
                    cast(InternalWorkingMemory.class);
                    // handle[i]
                    mv.visitVarInsn(ALOAD, handlePos);
                    invokeInterface(InternalFactHandle.class, "getObject", Object.class);
                    storeObjectFromDeclaration(declarations[i], declarationType);
                    // The facthandle should be set to that of the field, if it's an object, otherwise this will return null
                    // fact[i] = (InternalFactHandle)workingMemory.getFactHandle(obj);
                    mv.visitVarInsn(ALOAD, 2);
                    loadAsObject(objPos);
                    invokeInterface(WorkingMemory.class, "getFactHandle", FactHandle.class, Object.class);
                    cast(InternalFactHandle.class);
                    mv.visitVarInsn(ASTORE, handlePos);
                } else {
                    // handle[i]
                    mv.visitVarInsn(ALOAD, handlePos);
                    invokeInterface(InternalFactHandle.class, "getObject", Object.class);
                    mv.visitTypeInsn(CHECKCAST, internalName(declarationType));
                    // obj[i]
                    objAstorePos += store(objPos, declarationType);
                }
            }
            // @{ruleClassName}.@{methodName}(KnowledgeHelper, @foreach{declr : declarations} Object, FactHandle @end)
            StringBuilder consequenceMethodDescr = new StringBuilder("(L" + KnowledgeHelper.class.getName().replace('.', '/') + ";");
            // KnowledgeHelper
            mv.visitVarInsn(ALOAD, 1);
            for (int i = 0; i < declarations.length; i++) {
                // obj[i]
                load(paramsPos[i] + 1);
                // handle[i]
                mv.visitVarInsn(ALOAD, paramsPos[i]);
                consequenceMethodDescr.append(typeDescr(declarations[i].getTypeName())).append("L" + FactHandle.class.getName().replace('.', '/') + ";");
            }
            // @foreach{type : globalTypes, identifier : globals} @{type} @{identifier} = ( @{type} ) workingMemory.getGlobal( "@{identifier}" );
            parseGlobals(stub.getGlobals(), stub.getGlobalTypes(), 2, consequenceMethodDescr);
            consequenceMethodDescr.append(")V");
            mv.visitMethodInsn(INVOKESTATIC, stub.getInternalRuleClassName(), stub.getMethodName(), consequenceMethodDescr.toString());
            mv.visitInsn(RETURN);
        }
    });
    stub.setConsequence(generator.<Consequence>newInstance());
}