/**
* Copyright 2005 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.jbpm.workflow.instance.node;
import java.util.Iterator;
import java.util.Map;
import org.drools.common.InternalFactHandle;
import org.drools.common.InternalKnowledgeRuntime;
import org.drools.event.RuleFlowGroupActivatedEvent;
import org.drools.event.RuleFlowGroupDeactivatedEvent;
import org.drools.event.rule.ActivationCancelledEvent;
import org.drools.event.rule.ActivationCreatedEvent;
import org.drools.event.rule.AfterActivationFiredEvent;
import org.drools.event.rule.AgendaEventListener;
import org.drools.event.rule.AgendaGroupPoppedEvent;
import org.drools.event.rule.AgendaGroupPushedEvent;
import org.drools.event.rule.BeforeActivationFiredEvent;
import org.drools.impl.StatefulKnowledgeSessionImpl;
import org.drools.rule.Declaration;
import org.drools.rule.Rule;
import org.drools.runtime.process.NodeInstance;
import org.drools.runtime.rule.impl.InternalAgenda;
import org.drools.spi.Activation;
import org.jbpm.process.instance.ProcessInstance;
import org.jbpm.workflow.core.node.MilestoneNode;
/**
* Runtime counterpart of a milestone node.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public class MilestoneNodeInstance extends StateBasedNodeInstance implements AgendaEventListener {
private static final long serialVersionUID = 510l;
protected MilestoneNode getMilestoneNode() {
return (MilestoneNode) getNode();
}
public void internalTrigger(final NodeInstance from, String type) {
super.internalTrigger(from, type);
if (!org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
throw new IllegalArgumentException(
"A MilestoneNode only accepts default incoming connections!");
}
String rule = "RuleFlow-Milestone-" + getProcessInstance().getProcessId()
+ "-" + getMilestoneNode().getUniqueId();
boolean isActive = ((InternalAgenda) getProcessInstance().getKnowledgeRuntime().getAgenda())
.isRuleActiveInRuleFlowGroup("DROOLS_SYSTEM", rule, getProcessInstance().getId());
if (isActive) {
triggerCompleted();
} else {
addActivationListener();
}
}
private boolean checkProcessInstance(Activation activation) {
final Map<?, ?> declarations = activation.getSubRule().getOuterDeclarations();
for ( Iterator<?> it = declarations.values().iterator(); it.hasNext(); ) {
Declaration declaration = (Declaration) it.next();
if ("processInstance".equals(declaration.getIdentifier())) {
Object value = declaration.getValue(
((StatefulKnowledgeSessionImpl) getProcessInstance().getKnowledgeRuntime()).session,
((InternalFactHandle) activation.getTuple().get(declaration)).getObject());
if (value instanceof ProcessInstance) {
return ((ProcessInstance) value).getId() == getProcessInstance().getId();
}
}
}
return true;
}
public void addEventListeners() {
super.addEventListeners();
addActivationListener();
}
private void addActivationListener() {
getProcessInstance().getKnowledgeRuntime().addEventListener(this);
}
public void removeEventListeners() {
super.removeEventListeners();
getProcessInstance().getKnowledgeRuntime().removeEventListener(this);
}
public void activationCreated(ActivationCreatedEvent event) {
// check whether this activation is from the DROOLS_SYSTEM agenda group
String ruleFlowGroup = ((Rule) event.getActivation().getRule()).getRuleFlowGroup();
if ("DROOLS_SYSTEM".equals(ruleFlowGroup)) {
// new activations of the rule associate with a milestone node
// trigger node instances of that milestone node
String ruleName = event.getActivation().getRule().getName();
String milestoneName = "RuleFlow-Milestone-" + getProcessInstance().getProcessId() + "-" + getNodeId();
if (milestoneName.equals(ruleName) && checkProcessInstance((Activation) event.getActivation())) {
if ( !((InternalKnowledgeRuntime) getProcessInstance().getKnowledgeRuntime()).getActionQueue().isEmpty() ) {
((InternalKnowledgeRuntime) getProcessInstance().getKnowledgeRuntime()).executeQueuedActions();
}
synchronized(getProcessInstance()) {
removeEventListeners();
triggerCompleted();
}
}
}
}
public void activationCancelled(ActivationCancelledEvent event) {
// Do nothing
}
public void afterActivationFired(AfterActivationFiredEvent event) {
// Do nothing
}
public void agendaGroupPopped(AgendaGroupPoppedEvent event) {
// Do nothing
}
public void agendaGroupPushed(AgendaGroupPushedEvent event) {
// Do nothing
}
public void beforeActivationFired(BeforeActivationFiredEvent event) {
// Do nothing
}
public void afterRuleFlowGroupActivated(RuleFlowGroupActivatedEvent event) {
}
public void afterRuleFlowGroupDeactivated(RuleFlowGroupDeactivatedEvent event) {
}
public void beforeRuleFlowGroupActivated(RuleFlowGroupActivatedEvent event) {
}
public void beforeRuleFlowGroupDeactivated(RuleFlowGroupDeactivatedEvent event) {
}
}