/**
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.reteoo;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import junit.framework.TestCase;
import org.drools.Cheese;
import org.drools.RuleBaseConfiguration;
import org.drools.RuleBaseFactory;
import org.drools.base.ClassFieldAccessorCache;
import org.drools.base.ClassFieldAccessorStore;
import org.drools.base.ClassFieldReader;
import org.drools.base.ClassObjectType;
import org.drools.base.FieldFactory;
import org.drools.base.ValueType;
import org.drools.base.evaluators.EqualityEvaluatorsDefinition;
import org.drools.base.evaluators.Operator;
import org.drools.common.BetaConstraints;
import org.drools.common.DefaultFactHandle;
import org.drools.common.InternalFactHandle;
import org.drools.common.PropagationContextImpl;
import org.drools.common.SingleBetaConstraints;
import org.drools.reteoo.FromNode.FromMemory;
import org.drools.reteoo.builder.BuildContext;
import org.drools.rule.Declaration;
import org.drools.rule.LiteralConstraint;
import org.drools.rule.Pattern;
import org.drools.rule.VariableConstraint;
import org.drools.FactHandle;
import org.drools.WorkingMemory;
import org.drools.spi.AlphaNodeFieldConstraint;
import org.drools.spi.DataProvider;
import org.drools.spi.FieldValue;
import org.drools.spi.PropagationContext;
import org.drools.spi.Tuple;
public class FromNodeTest extends TestCase {
EqualityEvaluatorsDefinition equals = new EqualityEvaluatorsDefinition();
ClassFieldAccessorStore store = new ClassFieldAccessorStore();
private ReteooRuleBase ruleBase;
private BuildContext buildContext;
protected void setUp() throws Exception {
store.setClassFieldAccessorCache( new ClassFieldAccessorCache( Thread.currentThread().getContextClassLoader() ) );
store.setEagerWire( true );
ruleBase = (ReteooRuleBase) RuleBaseFactory.newRuleBase();
buildContext = new BuildContext( ruleBase,
new ReteooBuilder.IdGenerator() );
}
public void testAlphaNode() {
final PropagationContext context = new PropagationContextImpl( 0,
PropagationContext.ASSERTION,
null,
null,
null );
final ReteooWorkingMemory workingMemory = new ReteooWorkingMemory( 1,
ruleBase );
final ClassFieldReader extractor = store.getReader( Cheese.class,
"type",
getClass().getClassLoader() );
final FieldValue field = FieldFactory.getFieldValue( "stilton" );
final LiteralConstraint constraint = new LiteralConstraint( extractor,
equals.getEvaluator( ValueType.STRING_TYPE,
Operator.EQUAL ),
field );
final List list = new ArrayList();
final Cheese cheese1 = new Cheese( "cheddar",
20 );
final Cheese cheese2 = new Cheese( "brie",
20 );
list.add( cheese1 );
list.add( cheese2 );
final MockDataProvider dataProvider = new MockDataProvider( list );
final FromNode from = new FromNode( 3,
dataProvider,
null,
new AlphaNodeFieldConstraint[]{constraint},
null,
true,
buildContext );
final MockLeftTupleSink sink = new MockLeftTupleSink( 5 );
from.addTupleSink( sink );
final Person person1 = new Person( "xxx1",
30 );
final FactHandle person1Handle = workingMemory.insert( person1 );
final LeftTuple tuple1 = new LeftTuple( (DefaultFactHandle) person1Handle,
from,
true );
from.assertLeftTuple( tuple1,
context,
workingMemory );
// nothing should be asserted, as cheese1 is cheddar and we are filtering on stilton
assertEquals( 0,
sink.getAsserted().size() );
//Set cheese1 to stilton and it should now propagate
cheese1.setType( "stilton" );
final Person person2 = new Person( "xxx2",
30 );
final FactHandle person2Handle = workingMemory.insert( person2 );
final LeftTuple tuple2 = new LeftTuple( (DefaultFactHandle) person2Handle,
from,
true );
from.assertLeftTuple( tuple2,
context,
workingMemory );
final List asserted = sink.getAsserted();
assertEquals( 1,
asserted.size() );
Tuple tuple = (Tuple) ((Object[]) asserted.get( 0 ))[0];
assertSame( person2,
tuple.getFactHandles()[1].getObject() );
assertSame( cheese1,
tuple.getFactHandles()[0].getObject() );
cheese2.setType( "stilton" );
final Person person3 = new Person( "xxx2",
30 );
final FactHandle person3Handle = workingMemory.insert( person3 );
final LeftTuple tuple3 = new LeftTuple( (DefaultFactHandle) person3Handle,
from,
true );
from.assertLeftTuple( tuple3,
context,
workingMemory );
assertEquals( 3,
asserted.size() );
tuple = (Tuple) ((Object[]) asserted.get( 1 ))[0];
assertSame( person3,
tuple.getFactHandles()[1].getObject() );
assertSame( cheese1,
tuple.getFactHandles()[0].getObject() );
tuple = (Tuple) ((Object[]) asserted.get( 2 ))[0];
assertSame( person3,
tuple.getFactHandles()[1].getObject() );
assertSame( cheese2,
tuple.getFactHandles()[0].getObject() );
assertNotSame( cheese1,
cheese2 );
}
public void testBetaNode() {
final PropagationContext context = new PropagationContextImpl( 0,
PropagationContext.ASSERTION,
null,
null,
null );
final ReteooWorkingMemory workingMemory = new ReteooWorkingMemory( 1,
(ReteooRuleBase) RuleBaseFactory.newRuleBase() );
final ClassFieldReader priceExtractor = store.getReader( Cheese.class,
"price",
getClass().getClassLoader() );
final ClassFieldReader ageExtractor = store.getReader( Person.class,
"age",
getClass().getClassLoader() );
final Pattern pattern = new Pattern( 0,
new ClassObjectType( Person.class ) );
final Declaration declaration = new Declaration( "age",
ageExtractor,
pattern );
final VariableConstraint variableConstraint = new VariableConstraint( priceExtractor,
declaration,
equals.getEvaluator( ValueType.PINTEGER_TYPE,
Operator.EQUAL ) );
final RuleBaseConfiguration configuration = new RuleBaseConfiguration();
configuration.setIndexRightBetaMemory( false );
configuration.setIndexLeftBetaMemory( false );
final BetaConstraints betaConstraints = new SingleBetaConstraints( variableConstraint,
configuration );
final List list = new ArrayList();
final Cheese cheese1 = new Cheese( "cheddar",
18 );
final Cheese cheese2 = new Cheese( "brie",
12 );
list.add( cheese1 );
list.add( cheese2 );
final MockDataProvider dataProvider = new MockDataProvider( list );
final FromNode from = new FromNode( 3,
dataProvider,
null,
new AlphaNodeFieldConstraint[0],
betaConstraints,
true,
buildContext );
final MockLeftTupleSink sink = new MockLeftTupleSink( 5 );
from.addTupleSink( sink );
final Person person1 = new Person( "xxx1",
30 );
final FactHandle person1Handle = workingMemory.insert( person1 );
final LeftTuple tuple1 = new LeftTuple( (DefaultFactHandle) person1Handle,
from,
true );
from.assertLeftTuple( tuple1,
context,
workingMemory );
// nothing should be asserted, as cheese1 is cheddar and we are filtering on stilton
assertEquals( 0,
sink.getAsserted().size() );
//Set cheese1 to stilton and it should now propagate
cheese1.setPrice( 30 );
final Person person2 = new Person( "xxx2",
30 );
final FactHandle person2Handle = workingMemory.insert( person2 );
final LeftTuple tuple2 = new LeftTuple( (DefaultFactHandle) person2Handle,
from,
true );
from.assertLeftTuple( tuple2,
context,
workingMemory );
final List asserted = sink.getAsserted();
assertEquals( 1,
asserted.size() );
Tuple tuple = (Tuple) ((Object[]) asserted.get( 0 ))[0];
assertSame( person2,
tuple.getFactHandles()[1].getObject() );
assertSame( cheese1,
tuple.getFactHandles()[0].getObject() );
cheese2.setPrice( 30 );
final Person person3 = new Person( "xxx2",
30 );
final FactHandle person3Handle = workingMemory.insert( person3 );
final LeftTuple tuple3 = new LeftTuple( (DefaultFactHandle) person3Handle,
from,
true );
from.assertLeftTuple( tuple3,
context,
workingMemory );
assertEquals( 3,
asserted.size() );
tuple = (Tuple) ((Object[]) asserted.get( 1 ))[0];
assertSame( person3,
tuple.getFactHandles()[1].getObject() );
assertSame( cheese1,
tuple.getFactHandles()[0].getObject() );
tuple = (Tuple) ((Object[]) asserted.get( 2 ))[0];
assertSame( person3,
tuple.getFactHandles()[1].getObject() );
assertSame( cheese2,
tuple.getFactHandles()[0].getObject() );
assertNotSame( cheese1,
cheese2 );
}
public void testRestract() {
final PropagationContext context = new PropagationContextImpl( 0,
PropagationContext.ASSERTION,
null,
null,
null );
final ReteooWorkingMemory workingMemory = new ReteooWorkingMemory( 1,
(ReteooRuleBase) RuleBaseFactory.newRuleBase() );
final ClassFieldReader extractor = store.getReader( Cheese.class,
"type",
getClass().getClassLoader() );
final FieldValue field = FieldFactory.getFieldValue( "stilton" );
final LiteralConstraint constraint = new LiteralConstraint( extractor,
equals.getEvaluator( ValueType.STRING_TYPE,
Operator.EQUAL ),
field );
final List list = new ArrayList();
final Cheese cheese1 = new Cheese( "stilton",
5 );
final Cheese cheese2 = new Cheese( "stilton",
15 );
list.add( cheese1 );
list.add( cheese2 );
final MockDataProvider dataProvider = new MockDataProvider( list );
final FromNode from = new FromNode( 3,
dataProvider,
null,
new AlphaNodeFieldConstraint[]{constraint},
null,
true,
buildContext );
final MockLeftTupleSink sink = new MockLeftTupleSink( 5 );
from.addTupleSink( sink );
final List asserted = sink.getAsserted();
final Person person1 = new Person( "xxx2",
30 );
final FactHandle person1Handle = workingMemory.insert( person1 );
final LeftTuple tuple = new LeftTuple( (DefaultFactHandle) person1Handle,
from,
true );
from.assertLeftTuple( tuple,
context,
workingMemory );
assertEquals( 2,
asserted.size() );
final FromMemory memory = (FromMemory) workingMemory.getNodeMemory( from );
assertEquals( 1,
memory.betaMemory.getLeftTupleMemory().size() );
assertNull( memory.betaMemory.getRightTupleMemory() );
RightTuple rightTuple2 = tuple.firstChild.getRightParent();
RightTuple rightTuple1 = tuple.firstChild.getLeftParentNext().getRightParent();
assertFalse( rightTuple1.equals( rightTuple2 ) );
assertNull( tuple.firstChild.getLeftParentNext().getLeftParentNext() );
final InternalFactHandle handle2 = rightTuple2.getFactHandle();
final InternalFactHandle handle1 = rightTuple1.getFactHandle();
assertEquals( handle1.getObject(),
cheese2 );
assertEquals( handle2.getObject(),
cheese1 );
from.retractLeftTuple( tuple,
context,
workingMemory );
assertEquals( 0,
memory.betaMemory.getLeftTupleMemory().size() );
assertNull( memory.betaMemory.getRightTupleMemory() );
}
public static class MockDataProvider
implements
DataProvider {
private static final long serialVersionUID = 510l;
private Collection collection;
public Declaration[] getRequiredDeclarations() {
return null;
}
public MockDataProvider(final Collection collection) {
this.collection = collection;
}
public Iterator getResults(final Tuple tuple,
final WorkingMemory wm,
final PropagationContext ctx,
final Object providerContext) {
return this.collection.iterator();
}
public Object createContext() {
return null;
}
public DataProvider clone() {
return this;
}
public void replaceDeclaration(Declaration declaration,
Declaration resolved) {
}
}
public static class Person {
private String name;
private int age;
public Person(final String name,
final int age) {
super();
this.name = name;
this.age = age;
}
public int getAge() {
return this.age;
}
public String getName() {
return this.name;
}
}
}