private static ProtobufMessages.FactHandle writeFactHandle(
MarshallerWriteContext context,
ObjectMarshallingStrategyStore objectMarshallingStrategyStore,
InternalFactHandle handle)
throws IOException {
ProtobufMessages.FactHandle.Builder _handle = ProtobufMessages.FactHandle.newBuilder();
_handle.setType(getHandleType(handle));
_handle.setId(handle.getId());
_handle.setRecency(handle.getRecency());
if (_handle.getType() == ProtobufMessages.FactHandle.HandleType.EVENT) {
// is event
EventFactHandle efh = (EventFactHandle) handle;
_handle.setTimestamp(efh.getStartTimestamp());
_handle.setDuration(efh.getDuration());
_handle.setIsExpired(efh.isExpired());
_handle.setActivationsCount(efh.getActivationsCount());
}
if (handle.getEqualityKey() != null
&& handle.getEqualityKey().getStatus() == EqualityKey.JUSTIFIED) {
_handle.setIsJustified(true);
} else {
_handle.setIsJustified(false);
}
Object object = handle.getObject();
if (object != null) {
ObjectMarshallingStrategy strategy = objectMarshallingStrategyStore.getStrategyObject(object);
Integer index = context.getStrategyIndex(strategy);
_handle.setStrategyIndex(index.intValue());
_handle.setObject(
ByteString.copyFrom(
strategy.marshal(context.strategyContext.get(strategy), context, object)));
}
return _handle.build();
}
public static InternalFactHandle readFactHandle(
MarshallerReaderContext context, SessionEntryPoint entryPoint, FactHandle _handle)
throws IOException, ClassNotFoundException {
Object object = null;
ObjectMarshallingStrategy strategy = null;
if (_handle.hasStrategyIndex()) {
strategy = context.usedStrategies.get(_handle.getStrategyIndex());
object =
strategy.unmarshal(
context.strategyContexts.get(strategy),
context,
_handle.getObject().toByteArray(),
(context.ruleBase == null) ? null : context.ruleBase.getRootClassLoader());
}
InternalFactHandle handle = null;
switch (_handle.getType()) {
case FACT:
{
handle = new DefaultFactHandle(_handle.getId(), object, _handle.getRecency(), entryPoint);
break;
}
case QUERY:
{
handle = new QueryElementFactHandle(object, _handle.getId(), _handle.getRecency());
break;
}
case EVENT:
{
handle =
new EventFactHandle(
_handle.getId(),
object,
_handle.getRecency(),
_handle.getTimestamp(),
_handle.getDuration(),
entryPoint);
((EventFactHandle) handle).setExpired(_handle.getIsExpired());
// the event is re-propagated through the network, so the activations counter will be
// recalculated
// ((EventFactHandle) handle).setActivationsCount( _handle.getActivationsCount() );
break;
}
default:
{
throw new IllegalStateException(
"Unable to marshal FactHandle, as type does not exist:" + _handle.getType());
}
}
return handle;
}
public void execute(InternalWorkingMemory workingMemory) {
if (this.factHandle.isValid()) {
// if the fact is still in the working memory (since it may have been previously retracted
// already
final PropagationContext context =
new PropagationContextImpl(
workingMemory.getNextPropagationIdCounter(),
PropagationContext.EXPIRATION,
null,
null,
this.factHandle);
((EventFactHandle) factHandle).setExpired(true);
this.node.retractObject(factHandle, context, workingMemory);
context.evaluateActionQueue(workingMemory);
// if no activations for this expired event
if (((EventFactHandle) factHandle).getActivationsCount() == 0) {
// remove it from the object store and clean up resources
((EventFactHandle) factHandle).getEntryPoint().retract(factHandle);
}
context.evaluateActionQueue(workingMemory);
}
}
/**
* Fire this item.
*
* @param activation The activation to fire
* @throws org.drools.core.spi.ConsequenceException If an error occurs while attempting to fire
* the consequence.
*/
public synchronized void fireActivation(final Activation activation) throws ConsequenceException {
// We do this first as if a node modifies a fact that causes a recursion
// on an empty pattern
// we need to make sure it re-activates
this.workingMemory.startOperation();
isFiringActivation = true;
try {
final EventSupport eventsupport = (EventSupport) this.workingMemory;
eventsupport
.getAgendaEventSupport()
.fireBeforeActivationFired(activation, this.workingMemory);
if (activation.getActivationGroupNode() != null) {
// We know that this rule will cancel all other activations in the group
// so lets remove the information now, before the consequence fires
final InternalActivationGroup activationGroup =
activation.getActivationGroupNode().getActivationGroup();
activationGroup.removeActivation(activation);
clearAndCancelActivationGroup(activationGroup);
}
activation.setQueued(false);
try {
this.knowledgeHelper.setActivation(activation);
if (log.isTraceEnabled()) {
log.trace("Fire \"{}\" \n{}", activation.getRule().getName(), activation.getTuple());
}
activation.getConsequence().evaluate(this.knowledgeHelper, this.workingMemory);
this.knowledgeHelper.cancelRemainingPreviousLogicalDependencies();
this.knowledgeHelper.reset();
} catch (final Exception e) {
if (this.legacyConsequenceExceptionHandler != null) {
this.legacyConsequenceExceptionHandler.handleException(activation, this.workingMemory, e);
} else if (this.consequenceExceptionHandler != null) {
this.consequenceExceptionHandler.handleException(
activation, this.workingMemory.getKnowledgeRuntime(), e);
} else {
throw new RuntimeException(e);
}
} finally {
if (activation.getFactHandle() != null) {
// update the Activation in the WM
InternalFactHandle factHandle = activation.getFactHandle();
workingMemory
.getEntryPointNode()
.modifyActivation(factHandle, activation.getPropagationContext(), workingMemory);
activation.getPropagationContext().evaluateActionQueue(workingMemory);
}
// if the tuple contains expired events
for (LeftTuple tuple = activation.getTuple(); tuple != null; tuple = tuple.getParent()) {
if (tuple.getLastHandle() == null) {
// can be null for eval, not and exists that have no right input
continue;
}
if (tuple.getLastHandle().isEvent()) {
EventFactHandle handle = (EventFactHandle) tuple.getLastHandle();
// decrease the activation count for the event
handle.decreaseActivationsCount();
// handles "expire" only in stream mode.
if (handle.isExpired()) {
if (handle.getActivationsCount() <= 0) {
// and if no more activations, retract the handle
handle.getEntryPoint().retract(handle);
}
}
}
}
}
eventsupport.getAgendaEventSupport().fireAfterActivationFired(activation, this.workingMemory);
unstageActivations();
} finally {
isFiringActivation = false;
if (mustNotifyHalt) {
mustNotifyHalt = false;
notifyHalt();
}
this.workingMemory.endOperation();
}
}
