public void build(
final RuleBuildContext context,
final BoundIdentifiers usedIdentifiers,
final Declaration[] previousDeclarations,
final Declaration[] localDeclarations,
final PredicateConstraint predicate,
final PredicateDescr predicateDescr,
final AnalysisResult analysis) {
MVELDialect dialect = (MVELDialect) context.getDialect(context.getDialect().getId());
try {
Map<String, Class<?>> declIds =
context.getDeclarationResolver().getDeclarationClasses(context.getRule());
Pattern p = (Pattern) context.getBuildStack().peek();
if (p.getObjectType() instanceof ClassObjectType) {
declIds.put("this", ((ClassObjectType) p.getObjectType()).getClassType());
}
MVELCompilationUnit unit =
dialect.getMVELCompilationUnit(
(String) predicateDescr.getContent(),
analysis,
previousDeclarations,
localDeclarations,
null,
context);
MVELPredicateExpression expr =
new MVELPredicateExpression(unit, context.getDialect().getId());
predicate.setPredicateExpression(expr);
MVELDialectRuntimeData data =
(MVELDialectRuntimeData)
context
.getPkg()
.getDialectRuntimeRegistry()
.getDialectData(context.getDialect().getId());
data.addCompileable(predicate, expr);
expr.compile(context.getPackageBuilder().getRootClassLoader());
} catch (final Exception e) {
context
.getErrors()
.add(
new DescrBuildError(
context.getParentDescr(),
predicateDescr,
e,
"Unable to build expression for 'inline-eval' : "
+ e.getMessage()
+ "'"
+ predicateDescr.getContent()
+ "'\n"
+ e.getMessage()));
}
}
/**
* @param context
* @param pattern
* @param betaConstraints
*/
private void checkRemoveIdentities(
final BuildContext context, final Pattern pattern, final List<Constraint> betaConstraints) {
if (context.getRuleBase().getConfiguration().isRemoveIdentities()
&& pattern.getObjectType().getClass() == ClassObjectType.class) {
// Check if this object type exists before
// If it does we need stop instance equals cross product
final Class<?> thisClass = ((ClassObjectType) pattern.getObjectType()).getClassType();
for (final Iterator<Pattern> it = context.getObjectType().iterator(); it.hasNext(); ) {
final Pattern previousPattern = it.next();
final Class<?> previousClass =
((ClassObjectType) previousPattern.getObjectType()).getClassType();
if (thisClass.isAssignableFrom(previousClass)) {
betaConstraints.add(new InstanceNotEqualsConstraint(previousPattern));
}
}
// Must be added after the checking, otherwise it matches against itself
context.getObjectType().add(pattern);
}
}
private void createConstraints(
BuildContext context,
BuildUtils utils,
Pattern pattern,
List<Constraint> alphaConstraints,
List<Constraint> betaConstraints) {
final List<?> constraints = pattern.getConstraints();
// check if cross products for identity patterns should be disabled
checkRemoveIdentities(context, pattern, betaConstraints);
// checks if this pattern is nested inside a NOT CE
final boolean isNegative = isNegative(context);
for (final Iterator<?> it = constraints.iterator(); it.hasNext(); ) {
final Object object = it.next();
// Check if its a declaration
if (object instanceof Declaration) {
// nothing to be done
continue;
}
final Constraint constraint = (Constraint) object;
if (constraint.getType().equals(Constraint.ConstraintType.ALPHA)) {
alphaConstraints.add(constraint);
} else if (constraint.getType().equals(Constraint.ConstraintType.BETA)) {
betaConstraints.add(constraint);
if (isNegative
&& context.getRuleBase().getConfiguration().getEventProcessingMode()
== EventProcessingOption.STREAM
&& pattern.getObjectType().isEvent()
&& constraint.isTemporal()) {
checkDelaying(context, constraint);
}
} else {
throw new RuntimeDroolsException(
"Unknown constraint type: "
+ constraint.getType()
+ ". This is a bug. Please contact development team.");
}
}
}
@Override
protected void initDeclaredMask(BuildContext context, LeftTupleSource leftInput) {
if (context == null || context.getLastBuiltPatterns() == null) {
// only happens during unit tests
rightDeclaredMask = Long.MAX_VALUE;
super.initDeclaredMask(context, leftInput);
return;
}
if (!(rightInput instanceof RightInputAdapterNode)) {
Pattern pattern = context.getLastBuiltPatterns()[0]; // right input pattern
ObjectType objectType = pattern.getObjectType();
if (!(objectType instanceof ClassObjectType)) {
// InitialFact has no type declaration and cannot be property specific
// Only ClassObjectType can use property specific
rightDeclaredMask = Long.MAX_VALUE;
}
Class objectClass = ((ClassObjectType) objectType).getClassType();
if (isPropertyReactive(context, objectClass)) {
rightListenedProperties = pattern.getListenedProperties();
List<String> settableProperties = getSettableProperties(context.getRuleBase(), objectClass);
rightDeclaredMask = calculatePositiveMask(rightListenedProperties, settableProperties);
rightDeclaredMask |= constraints.getListenedPropertyMask(settableProperties);
rightNegativeMask = calculateNegativeMask(rightListenedProperties, settableProperties);
} else {
// if property reactive is not on, then accept all modification propagations
rightDeclaredMask = Long.MAX_VALUE;
}
} else {
rightDeclaredMask = Long.MAX_VALUE;
// There would have been no right input pattern, so swap current to first, so leftInput can
// still work
context.setLastBuiltPattern(context.getLastBuiltPatterns()[0]);
}
super.initDeclaredMask(context, leftInput);
}
public void attachAlphaNodes(
final BuildContext context,
final BuildUtils utils,
final Pattern pattern,
List<Constraint> alphaConstraints)
throws InvalidPatternException {
// Drools Query ObjectTypeNode never has memory, but other ObjectTypeNode/AlphaNoesNodes may (if
// not in sequential),
// so need to preserve, so we can restore after this node is added. LeftMemory and Terminal
// remain the same once set.
boolean objectMemory = context.isObjectTypeNodeMemoryEnabled();
boolean alphaMemory = context.isAlphaMemoryAllowed();
ObjectType objectType = pattern.getObjectType();
if (pattern.getObjectType() instanceof ClassObjectType) {
// Is this the query node, if so we don't want any memory
if (DroolsQuery.class == ((ClassObjectType) pattern.getObjectType()).getClassType()) {
context.setTupleMemoryEnabled(false);
context.setObjectTypeNodeMemoryEnabled(false);
context.setTerminalNodeMemoryEnabled(false);
context.setAlphaNodeMemoryAllowed(false);
}
}
context.setObjectSource(
(ObjectSource)
utils.attachNode(
context,
new EntryPointNode(context.getNextId(), context.getRuleBase().getRete(), context)));
ObjectTypeNode otn =
new ObjectTypeNode(
context.getNextId(), (EntryPointNode) context.getObjectSource(), objectType, context);
if (objectType.isEvent()
&& EventProcessingOption.STREAM.equals(
context.getRuleBase().getConfiguration().getEventProcessingMode())) {
long expirationOffset = getExpiratioOffsetForType(context, objectType);
if (expirationOffset != -1) {
// expiration policy is set, so use it
otn.setExpirationOffset(expirationOffset);
} else {
// otherwise calculate it based on behaviours and temporal constraints
for (Behavior behavior : pattern.getBehaviors()) {
if (behavior.getExpirationOffset() != -1) {
expirationOffset = Math.max(behavior.getExpirationOffset(), expirationOffset);
}
}
long distance = context.getTemporalDistance().getExpirationOffset(pattern);
if (distance == -1) {
// it means the rules have no temporal constraints, or
// the constraints require events to be hold forever. In this
// case, we allow type declarations to override the implicit
// expiration offset by defining an expiration policy with the
// @expires tag
otn.setExpirationOffset(expirationOffset);
} else {
otn.setExpirationOffset(Math.max(distance, expirationOffset));
}
}
}
context.setObjectSource((ObjectSource) utils.attachNode(context, otn));
for (final Iterator<Constraint> it = alphaConstraints.iterator(); it.hasNext(); ) {
final AlphaNodeFieldConstraint constraint = (AlphaNodeFieldConstraint) it.next();
context.pushRuleComponent(constraint);
context.setObjectSource(
(ObjectSource)
utils.attachNode(
context,
new AlphaNode(
context.getNextId(),
(AlphaNodeFieldConstraint) constraint,
context.getObjectSource(),
context)));
context.popRuleComponent();
}
// now restore back to original values
context.setObjectTypeNodeMemoryEnabled(objectMemory);
context.setAlphaNodeMemoryAllowed(alphaMemory);
}