コード例 #1
0
ファイル: ReteAgenda.java プロジェクト: chearius/drools
  /**
   * 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();
    }
  }
コード例 #2
0
  private static void readBeliefSet(
      MarshallerReaderContext context,
      TruthMaintenanceSystem tms,
      EqualityKey key,
      ProtobufMessages.BeliefSet _beliefSet)
      throws IOException, ClassNotFoundException {
    InternalFactHandle handle = (InternalFactHandle) context.handles.get(_beliefSet.getHandleId());
    for (ProtobufMessages.LogicalDependency _logicalDependency :
        _beliefSet.getLogicalDependencyList()) {
      ProtobufMessages.Activation _activation = _logicalDependency.getActivation();
      Activation activation =
          (Activation)
              context
                  .filter
                  .getTuplesCache()
                  .get(
                      PersisterHelper.createActivationKey(
                          _activation.getPackageName(),
                          _activation.getRuleName(),
                          _activation.getTuple()))
                  .getObject();

      Object object = null;
      ObjectMarshallingStrategy strategy = null;
      if (_logicalDependency.hasObjectStrategyIndex()) {
        strategy = context.usedStrategies.get(_logicalDependency.getObjectStrategyIndex());
        object =
            strategy.unmarshal(
                context.strategyContexts.get(strategy),
                context,
                _logicalDependency.getObject().toByteArray(),
                (context.ruleBase == null) ? null : context.ruleBase.getRootClassLoader());
      }

      Object value = null;
      if (_logicalDependency.hasValueStrategyIndex()) {
        strategy = context.usedStrategies.get(_logicalDependency.getValueStrategyIndex());
        value =
            strategy.unmarshal(
                context.strategyContexts.get(strategy),
                context,
                _logicalDependency.getValue().toByteArray(),
                (context.ruleBase == null) ? null : context.ruleBase.getRootClassLoader());
      }

      ObjectTypeConf typeConf =
          context
              .wm
              .getObjectTypeConfigurationRegistry()
              .getObjectTypeConf(
                  ((NamedEntryPoint) handle.getEntryPoint()).getEntryPoint(), handle.getObject());
      tms.readLogicalDependency(
          handle,
          object,
          value,
          activation,
          activation.getPropagationContext(),
          activation.getRule(),
          typeConf);
    }
  }