/**
* 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.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.definition.process.Connection;
import org.drools.event.rule.ActivationCreatedEvent;
import org.drools.impl.StatefulKnowledgeSessionImpl;
import org.drools.rule.Declaration;
import org.drools.runtime.process.EventListener;
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.Constraint;
import org.jbpm.workflow.core.impl.ExtendedNodeImpl;
import org.jbpm.workflow.core.impl.NodeImpl;
import org.jbpm.workflow.core.node.StateNode;
import org.jbpm.workflow.instance.NodeInstanceContainer;
public class StateNodeInstance extends CompositeContextNodeInstance implements EventListener {
private static final long serialVersionUID = 510l;
protected StateNode getStateNode() {
return (StateNode) getNode();
}
public void internalTrigger(NodeInstance from, String type) {
super.internalTrigger(from, type);
// TODO: composite states trigger
StateNode stateNode = getStateNode();
Connection selected = null;
int priority = Integer.MAX_VALUE;
for (Connection connection: stateNode.getOutgoingConnections(NodeImpl.CONNECTION_DEFAULT_TYPE)) {
Constraint constraint = stateNode.getConstraint(connection);
if (constraint != null && constraint.getPriority() < priority) {
String rule = "RuleFlowStateNode-" + getProcessInstance().getProcessId() + "-" +
getStateNode().getUniqueId() + "-" +
connection.getTo().getId() + "-" +
connection.getToType();
boolean isActive = ((InternalAgenda) getProcessInstance().getKnowledgeRuntime().getAgenda())
.isRuleActiveInRuleFlowGroup("DROOLS_SYSTEM", rule, getProcessInstance().getId());
if (isActive) {
selected = connection;
priority = constraint.getPriority();
}
}
}
if (selected != null) {
((NodeInstanceContainer) getNodeInstanceContainer()).removeNodeInstance(this);
triggerConnection(selected);
} else {
addTriggerListener();
addActivationListener();
}
}
protected boolean isLinkedIncomingNodeRequired() {
return false;
}
public void signalEvent(String type, Object event) {
if ("signal".equals(type)) {
if (event instanceof String) {
for (Connection connection: getStateNode().getOutgoingConnections(NodeImpl.CONNECTION_DEFAULT_TYPE)) {
boolean selected = false;
Constraint constraint = getStateNode().getConstraint(connection);
if (constraint == null) {
if (((String) event).equals(connection.getTo().getName())) {
selected = true;
}
} else if (((String) event).equals(constraint.getName())) {
selected = true;
}
if (selected) {
triggerEvent(ExtendedNodeImpl.EVENT_NODE_EXIT);
removeEventListeners();
((org.jbpm.workflow.instance.NodeInstanceContainer) getNodeInstanceContainer())
.removeNodeInstance(this);
triggerConnection(connection);
return;
}
}
}
} else if (getActivationEventType().equals(type)) {
if (event instanceof ActivationCreatedEvent) {
activationCreated((ActivationCreatedEvent) event);
}
} else {
super.signalEvent(type, event);
}
}
private void addTriggerListener() {
getProcessInstance().addEventListener("signal", this, false);
}
private void addActivationListener() {
getProcessInstance().addEventListener(getActivationEventType(), this, true);
}
public void addEventListeners() {
super.addEventListeners();
addTriggerListener();
addActivationListener();
}
public void removeEventListeners() {
super.removeEventListeners();
getProcessInstance().removeEventListener("signal", this, false);
getProcessInstance().removeEventListener(getActivationEventType(), this, true);
}
public String[] getEventTypes() {
return new String[] { "signal", getActivationEventType() };
}
private String getActivationEventType() {
return "RuleFlowStateNode-" + getProcessInstance().getProcessId()
+ "-" + getStateNode().getUniqueId();
}
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 activationCreated(ActivationCreatedEvent event) {
Connection selected = null;
for (Connection connection: getNode().getOutgoingConnections(NodeImpl.CONNECTION_DEFAULT_TYPE)) {
Constraint constraint = getStateNode().getConstraint(connection);
if (constraint != null) {
String constraintName = getActivationEventType() + "-"
+ connection.getTo().getId() + "-" + connection.getToType();
if (constraintName.equals(event.getActivation().getRule().getName())
&& checkProcessInstance((Activation) event.getActivation())) {
selected = connection;
}
}
}
if (selected != null) {
if ( !((InternalKnowledgeRuntime) getProcessInstance().getKnowledgeRuntime()).getActionQueue().isEmpty() ) {
((InternalKnowledgeRuntime) getProcessInstance().getKnowledgeRuntime()).executeQueuedActions();
}
removeEventListeners();
((NodeInstanceContainer) getNodeInstanceContainer()).removeNodeInstance(this);
triggerConnection(selected);
}
}
}