/**
* 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.drools.workflow.instance.impl;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.drools.WorkingMemory;
import org.drools.common.InternalKnowledgeRuntime;
import org.drools.common.InternalWorkingMemory;
import org.drools.definition.process.Connection;
import org.drools.definition.process.Node;
import org.drools.process.core.Context;
import org.drools.process.core.ContextContainer;
import org.drools.process.core.context.exclusive.ExclusiveGroup;
import org.drools.process.core.context.variable.VariableScope;
import org.drools.process.instance.ContextInstance;
import org.drools.process.instance.ContextInstanceContainer;
import org.drools.process.instance.InternalProcessRuntime;
import org.drools.process.instance.ProcessInstance;
import org.drools.process.instance.context.exclusive.ExclusiveGroupInstance;
import org.drools.process.instance.context.variable.VariableScopeInstance;
import org.drools.runtime.process.NodeInstance;
import org.drools.runtime.process.NodeInstanceContainer;
import org.drools.workflow.core.impl.NodeImpl;
import org.drools.workflow.instance.WorkflowProcessInstance;
import org.drools.workflow.instance.node.CompositeNodeInstance;
/**
* Default implementation of a RuleFlow node instance.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public abstract class NodeInstanceImpl implements org.drools.workflow.instance.NodeInstance, Serializable {
private static final long serialVersionUID = 510l;
private long id;
private long nodeId;
private WorkflowProcessInstance processInstance;
private org.drools.workflow.instance.NodeInstanceContainer nodeInstanceContainer;
public void setId(final long id) {
this.id = id;
}
public long getId() {
return this.id;
}
public void setNodeId(final long nodeId) {
this.nodeId = nodeId;
}
public long getNodeId() {
return this.nodeId;
}
public String getNodeName() {
Node node = getNode();
return node == null ? "" : node.getName();
}
public void setProcessInstance(final WorkflowProcessInstance processInstance) {
this.processInstance = processInstance;
}
public WorkflowProcessInstance getProcessInstance() {
return this.processInstance;
}
public NodeInstanceContainer getNodeInstanceContainer() {
return this.nodeInstanceContainer;
}
public void setNodeInstanceContainer(NodeInstanceContainer nodeInstanceContainer) {
this.nodeInstanceContainer = (org.drools.workflow.instance.NodeInstanceContainer) nodeInstanceContainer;
if (nodeInstanceContainer != null) {
this.nodeInstanceContainer.addNodeInstance(this);
}
}
public Node getNode() {
return ((org.drools.workflow.core.NodeContainer)
this.nodeInstanceContainer.getNodeContainer()).internalGetNode( this.nodeId );
}
public boolean isInversionOfControl() {
return false;
}
public void cancel() {
nodeInstanceContainer.removeNodeInstance(this);
}
public final void trigger(NodeInstance from, String type) {
boolean hidden = false;
if (getNode().getMetaData().get("hidden") != null) {
hidden = true;
}
InternalKnowledgeRuntime kruntime = getProcessInstance().getKnowledgeRuntime();
if (!hidden) {
((InternalProcessRuntime) kruntime.getProcessRuntime())
.getProcessEventSupport().fireBeforeNodeTriggered(this, kruntime);
}
internalTrigger(from, type);
if (!hidden) {
((InternalProcessRuntime) kruntime.getProcessRuntime())
.getProcessEventSupport().fireAfterNodeTriggered(this, kruntime);
}
}
public abstract void internalTrigger(NodeInstance from, String type);
protected void triggerCompleted(String type, boolean remove) {
if (remove) {
((org.drools.workflow.instance.NodeInstanceContainer) getNodeInstanceContainer())
.removeNodeInstance(this);
}
Node node = getNode();
List<Connection> connections = null;
if (node != null) {
connections = node.getOutgoingConnections(type);
}
if (connections == null || connections.isEmpty()) {
((org.drools.workflow.instance.NodeInstanceContainer) getNodeInstanceContainer())
.nodeInstanceCompleted(this, type);
} else {
for (Connection connection: connections) {
// stop if this process instance has been aborted / completed
if (getProcessInstance().getState() != ProcessInstance.STATE_ACTIVE) {
return;
}
triggerConnection(connection);
}
}
}
protected void triggerConnection(Connection connection) {
boolean hidden = false;
if (getNode().getMetaData().get("hidden") != null) {
hidden = true;
}
InternalKnowledgeRuntime kruntime = getProcessInstance().getKnowledgeRuntime();
if (!hidden) {
((InternalProcessRuntime) kruntime.getProcessRuntime())
.getProcessEventSupport().fireBeforeNodeLeft(this, kruntime);
}
// check for exclusive group first
NodeInstanceContainer parent = getNodeInstanceContainer();
if (parent instanceof ContextInstanceContainer) {
List<ContextInstance> contextInstances = ((ContextInstanceContainer) parent).getContextInstances(ExclusiveGroup.EXCLUSIVE_GROUP);
if (contextInstances != null) {
for (ContextInstance contextInstance: new ArrayList<ContextInstance>(contextInstances)) {
ExclusiveGroupInstance groupInstance = (ExclusiveGroupInstance) contextInstance;
if (groupInstance.containsNodeInstance(this)) {
for (NodeInstance nodeInstance: groupInstance.getNodeInstances()) {
if (nodeInstance != this) {
((org.drools.workflow.instance.NodeInstance) nodeInstance).cancel();
}
}
((ContextInstanceContainer) parent).removeContextInstance(ExclusiveGroup.EXCLUSIVE_GROUP, contextInstance);
}
}
}
}
// trigger next node
((org.drools.workflow.instance.NodeInstance) ((org.drools.workflow.instance.NodeInstanceContainer) getNodeInstanceContainer())
.getNodeInstance(connection.getTo())).trigger(this, connection.getToType());
if (!hidden) {
((InternalProcessRuntime) kruntime.getProcessRuntime())
.getProcessEventSupport().fireAfterNodeLeft(this, kruntime);
}
}
public Context resolveContext(String contextId, Object param) {
return ((NodeImpl) getNode()).resolveContext(contextId, param);
}
public ContextInstance resolveContextInstance(String contextId, Object param) {
Context context = resolveContext(contextId, param);
if (context == null) {
return null;
}
ContextInstanceContainer contextInstanceContainer
= getContextInstanceContainer(context.getContextContainer());
if (contextInstanceContainer == null) {
throw new IllegalArgumentException(
"Could not find context instance container for context");
}
return contextInstanceContainer.getContextInstance(context);
}
private ContextInstanceContainer getContextInstanceContainer(ContextContainer contextContainer) {
ContextInstanceContainer contextInstanceContainer = null;
if (this instanceof ContextInstanceContainer) {
contextInstanceContainer = (ContextInstanceContainer) this;
} else {
contextInstanceContainer = getEnclosingContextInstanceContainer(this);
}
while (contextInstanceContainer != null) {
if (contextInstanceContainer.getContextContainer() == contextContainer) {
return contextInstanceContainer;
}
contextInstanceContainer = getEnclosingContextInstanceContainer(
(NodeInstance) contextInstanceContainer);
}
return null;
}
private ContextInstanceContainer getEnclosingContextInstanceContainer(NodeInstance nodeInstance) {
NodeInstanceContainer nodeInstanceContainer = nodeInstance.getNodeInstanceContainer();
while (true) {
if (nodeInstanceContainer instanceof ContextInstanceContainer) {
return (ContextInstanceContainer) nodeInstanceContainer;
}
if (nodeInstanceContainer instanceof NodeInstance) {
nodeInstanceContainer = ((NodeInstance) nodeInstanceContainer).getNodeInstanceContainer();
} else {
return null;
}
}
}
public Object getVariable(String variableName) {
VariableScopeInstance variableScope = (VariableScopeInstance)
resolveContextInstance(VariableScope.VARIABLE_SCOPE, variableName);
if (variableScope == null) {
variableScope = (VariableScopeInstance) ((ProcessInstance)
getProcessInstance()).getContextInstance(VariableScope.VARIABLE_SCOPE);
}
return variableScope.getVariable(variableName);
}
public void setVariable(String variableName, Object value) {
VariableScopeInstance variableScope = (VariableScopeInstance)
resolveContextInstance(VariableScope.VARIABLE_SCOPE, variableName);
if (variableScope == null) {
variableScope = (VariableScopeInstance) getProcessInstance().getContextInstance(VariableScope.VARIABLE_SCOPE);
if (variableScope.getVariableScope().findVariable(variableName) == null) {
variableScope = null;
}
}
if (variableScope == null) {
System.err.println("Could not find variable " + variableName);
System.err.println("Using process-level scope");
variableScope = (VariableScopeInstance) ((ProcessInstance)
getProcessInstance()).getContextInstance(VariableScope.VARIABLE_SCOPE);
}
variableScope.setVariable(variableName, value);
}
public String getUniqueId() {
String result = "" + getId();
NodeInstanceContainer parent = getNodeInstanceContainer();
while (parent instanceof CompositeNodeInstance) {
CompositeNodeInstance nodeInstance = (CompositeNodeInstance) parent;
result = nodeInstance.getId() + ":" + result;
parent = nodeInstance.getNodeInstanceContainer();
}
return result;
}
}