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org.jbpm.marshalling.impl.AbstractProcessInstanceMarshaller Maven / Gradle / Ivy
/*
* Copyright 2017 Red Hat, Inc. and/or its affiliates.
*
* 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.marshalling.impl;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.drools.core.common.InternalWorkingMemory;
import org.drools.core.impl.InternalKnowledgeBase;
import org.drools.core.marshalling.impl.MarshallerReaderContext;
import org.drools.core.marshalling.impl.MarshallerWriteContext;
import org.drools.core.marshalling.impl.PersisterEnums;
import org.drools.core.util.StringUtils;
import org.jbpm.process.core.Context;
import org.jbpm.process.core.context.exclusive.ExclusiveGroup;
import org.jbpm.process.core.context.swimlane.SwimlaneContext;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.instance.ContextInstance;
import org.jbpm.process.instance.context.exclusive.ExclusiveGroupInstance;
import org.jbpm.process.instance.context.swimlane.SwimlaneContextInstance;
import org.jbpm.process.instance.context.variable.VariableScopeInstance;
import org.jbpm.workflow.instance.impl.NodeInstanceImpl;
import org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl;
import org.jbpm.workflow.instance.node.*;
import org.kie.api.definition.process.Process;
import org.kie.api.marshalling.ObjectMarshallingStrategy;
import org.kie.api.runtime.process.NodeInstance;
import org.kie.api.runtime.process.NodeInstanceContainer;
import org.kie.api.runtime.process.ProcessInstance;
import org.kie.api.runtime.process.WorkflowProcessInstance;
/**
* Default implementation of a process instance marshaller.
*
*/
public abstract class AbstractProcessInstanceMarshaller implements
ProcessInstanceMarshaller {
// Output methods
public Object writeProcessInstance(MarshallerWriteContext context,
ProcessInstance processInstance) throws IOException {
WorkflowProcessInstanceImpl workFlow = (WorkflowProcessInstanceImpl) processInstance;
context.writeLong(workFlow.getId());
context.writeUTF(workFlow.getProcessId());
context.writeInt(workFlow.getState());
context.writeLong(workFlow.getNodeInstanceCounter());
SwimlaneContextInstance swimlaneContextInstance = (SwimlaneContextInstance) workFlow.getContextInstance(SwimlaneContext.SWIMLANE_SCOPE);
if (swimlaneContextInstance != null) {
Map swimlaneActors = swimlaneContextInstance.getSwimlaneActors();
context.writeInt(swimlaneActors.size());
for (Map.Entry entry : swimlaneActors.entrySet()) {
context.writeUTF(entry.getKey());
context.writeUTF(entry.getValue());
}
} else {
context.writeInt(0);
}
List nodeInstances = new ArrayList(workFlow.getNodeInstances());
Collections.sort(nodeInstances,
new Comparator() {
public int compare(NodeInstance o1,
NodeInstance o2) {
return (int) (o1.getId() - o2.getId());
}
});
for (NodeInstance nodeInstance : nodeInstances) {
context.writeShort(PersisterEnums.NODE_INSTANCE);
writeNodeInstance(context,
nodeInstance);
}
context.writeShort(PersisterEnums.END);
List exclusiveGroupInstances =
workFlow.getContextInstances(ExclusiveGroup.EXCLUSIVE_GROUP);
if (exclusiveGroupInstances == null) {
context.writeInt(0);
} else {
context.writeInt(exclusiveGroupInstances.size());
for (ContextInstance contextInstance: exclusiveGroupInstances) {
ExclusiveGroupInstance exclusiveGroupInstance = (ExclusiveGroupInstance) contextInstance;
Collection groupNodeInstances = exclusiveGroupInstance.getNodeInstances();
context.writeInt(groupNodeInstances.size());
for (NodeInstance nodeInstance: groupNodeInstances) {
context.writeLong(nodeInstance.getId());
}
}
}
VariableScopeInstance variableScopeInstance = (VariableScopeInstance) workFlow.getContextInstance(VariableScope.VARIABLE_SCOPE);
Map variables = variableScopeInstance.getVariables();
List keys = new ArrayList(variables.keySet());
Collection values = variables.values();
Collections.sort(keys,
new Comparator() {
public int compare(String o1,
String o2) {
return o1.compareTo(o2);
}
});
// Process Variables
// - Number of non null Variables = nonnullvariables.size()
// For Each Variable
// - Variable Key
// - Marshalling Strategy Index
// - Marshalled Object
Collection notNullValues = new ArrayList();
for(Object value: values){
if(value != null){
notNullValues.add(value);
}
}
context.writeInt(notNullValues.size());
for (String key : keys) {
Object object = variables.get(key);
if(object != null){
context.writeUTF(key);
// New marshalling algorithm when using strategies
int useNewMarshallingStrategyAlgorithm = -2;
context.writeInt(useNewMarshallingStrategyAlgorithm);
// Choose first strategy that accepts the object (what was always done)
ObjectMarshallingStrategy strategy = context.getObjectMarshallingStrategyStore().getStrategyObject(object);
context.writeUTF(strategy.getClass().getName());
strategy.write((ObjectOutputStream) context, object);
}
}
return null;
}
public Object writeNodeInstance(MarshallerWriteContext context,
NodeInstance nodeInstance) throws IOException {
context.writeLong(nodeInstance.getId());
context.writeLong(nodeInstance.getNodeId());
writeNodeInstanceContent(context, nodeInstance, context);
return null;
}
protected void writeNodeInstanceContent(MarshallerWriteContext stream,
NodeInstance nodeInstance, MarshallerWriteContext context)
throws IOException {
if (nodeInstance instanceof RuleSetNodeInstance) {
stream.writeShort(PersisterEnums.RULE_SET_NODE_INSTANCE);
List timerInstances =
((RuleSetNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
} else if (nodeInstance instanceof HumanTaskNodeInstance) {
stream.writeShort(PersisterEnums.HUMAN_TASK_NODE_INSTANCE);
stream.writeLong(((HumanTaskNodeInstance) nodeInstance).getWorkItemId());
List timerInstances =
((HumanTaskNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
} else if (nodeInstance instanceof WorkItemNodeInstance) {
stream.writeShort(PersisterEnums.WORK_ITEM_NODE_INSTANCE);
stream.writeLong(((WorkItemNodeInstance) nodeInstance).getWorkItemId());
List timerInstances =
((WorkItemNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
} else if (nodeInstance instanceof SubProcessNodeInstance) {
stream.writeShort(PersisterEnums.SUB_PROCESS_NODE_INSTANCE);
stream.writeLong(((SubProcessNodeInstance) nodeInstance).getProcessInstanceId());
List timerInstances =
((SubProcessNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
} else if (nodeInstance instanceof MilestoneNodeInstance) {
stream.writeShort(PersisterEnums.MILESTONE_NODE_INSTANCE);
List timerInstances =
((MilestoneNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
} else if (nodeInstance instanceof EventNodeInstance) {
stream.writeShort(PersisterEnums.EVENT_NODE_INSTANCE);
} else if (nodeInstance instanceof TimerNodeInstance) {
stream.writeShort(PersisterEnums.TIMER_NODE_INSTANCE);
stream.writeLong(((TimerNodeInstance) nodeInstance).getTimerId());
} else if (nodeInstance instanceof JoinInstance) {
stream.writeShort(PersisterEnums.JOIN_NODE_INSTANCE);
Map triggers = ((JoinInstance) nodeInstance).getTriggers();
stream.writeInt(triggers.size());
List keys = new ArrayList(triggers.keySet());
Collections.sort(keys,
new Comparator() {
public int compare(Long o1,
Long o2) {
return o1.compareTo(o2);
}
});
for (Long key : keys) {
stream.writeLong(key);
stream.writeInt(triggers.get(key));
}
} else if (nodeInstance instanceof StateNodeInstance) {
stream.writeShort(PersisterEnums.STATE_NODE_INSTANCE);
List timerInstances =
((StateNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
} else if (nodeInstance instanceof CompositeContextNodeInstance) {
if (nodeInstance instanceof DynamicNodeInstance) {
stream.writeShort(PersisterEnums.DYNAMIC_NODE_INSTANCE);
} else {
stream.writeShort(PersisterEnums.COMPOSITE_NODE_INSTANCE);
}
CompositeContextNodeInstance compositeNodeInstance = (CompositeContextNodeInstance) nodeInstance;
List timerInstances =
((CompositeContextNodeInstance) nodeInstance).getTimerInstances();
if (timerInstances != null) {
stream.writeInt(timerInstances.size());
for (Long id : timerInstances) {
stream.writeLong(id);
}
} else {
stream.writeInt(0);
}
VariableScopeInstance variableScopeInstance = (VariableScopeInstance) compositeNodeInstance.getContextInstance(VariableScope.VARIABLE_SCOPE);
if (variableScopeInstance == null) {
stream.writeInt(0);
} else {
Map variables = variableScopeInstance.getVariables();
List keys = new ArrayList(variables.keySet());
Collections.sort(keys,
new Comparator() {
public int compare(String o1,
String o2) {
return o1.compareTo(o2);
}
});
stream.writeInt(keys.size());
for (String key : keys) {
stream.writeUTF(key);
stream.writeObject(variables.get(key));
}
}
List nodeInstances = new ArrayList(compositeNodeInstance.getNodeInstances());
Collections.sort(nodeInstances,
new Comparator() {
public int compare(NodeInstance o1,
NodeInstance o2) {
return (int) (o1.getId() - o2.getId());
}
});
for (NodeInstance subNodeInstance : nodeInstances) {
stream.writeShort(PersisterEnums.NODE_INSTANCE);
writeNodeInstance(context,
subNodeInstance);
}
stream.writeShort(PersisterEnums.END);
List exclusiveGroupInstances =
compositeNodeInstance.getContextInstances(ExclusiveGroup.EXCLUSIVE_GROUP);
if (exclusiveGroupInstances == null) {
stream.writeInt(0);
} else {
stream.writeInt(exclusiveGroupInstances.size());
for (ContextInstance contextInstance: exclusiveGroupInstances) {
ExclusiveGroupInstance exclusiveGroupInstance = (ExclusiveGroupInstance) contextInstance;
Collection groupNodeInstances = exclusiveGroupInstance.getNodeInstances();
stream.writeInt(groupNodeInstances.size());
for (NodeInstance groupNodeInstance: groupNodeInstances) {
stream.writeLong(groupNodeInstance.getId());
}
}
}
} else if (nodeInstance instanceof ForEachNodeInstance) {
stream.writeShort(PersisterEnums.FOR_EACH_NODE_INSTANCE);
ForEachNodeInstance forEachNodeInstance = (ForEachNodeInstance) nodeInstance;
List nodeInstances = new ArrayList(forEachNodeInstance.getNodeInstances());
Collections.sort(nodeInstances,
new Comparator() {
public int compare(NodeInstance o1,
NodeInstance o2) {
return (int) (o1.getId() - o2.getId());
}
});
for (NodeInstance subNodeInstance : nodeInstances) {
if (subNodeInstance instanceof CompositeContextNodeInstance) {
stream.writeShort(PersisterEnums.NODE_INSTANCE);
writeNodeInstance(context,
subNodeInstance);
}
}
stream.writeShort(PersisterEnums.END);
} else {
throw new IllegalArgumentException("Unknown node instance type: " + nodeInstance);
}
}
// Input methods
public ProcessInstance readProcessInstance(MarshallerReaderContext context) throws IOException {
InternalKnowledgeBase kBase = context.getKnowledgeBase();
InternalWorkingMemory wm = context.getWorkingMemory();
WorkflowProcessInstanceImpl processInstance = createProcessInstance();
processInstance.setId(context.readLong());
String processId = context.readUTF();
processInstance.setProcessId(processId);
Process process = kBase.getProcess(processId);
if (kBase != null) {
processInstance.setProcess(process);
}
processInstance.setState(context.readInt());
long nodeInstanceCounter = context.readLong();
processInstance.setKnowledgeRuntime(wm.getKnowledgeRuntime());
int nbSwimlanes = context.readInt();
if (nbSwimlanes > 0) {
Context swimlaneContext = ((org.jbpm.process.core.Process) process).getDefaultContext(SwimlaneContext.SWIMLANE_SCOPE);
SwimlaneContextInstance swimlaneContextInstance = (SwimlaneContextInstance) processInstance.getContextInstance(swimlaneContext);
for (int i = 0; i < nbSwimlanes; i++) {
String name = context.readUTF();
String value = context.readUTF();
swimlaneContextInstance.setActorId(name, value);
}
}
while (context.readShort() == PersisterEnums.NODE_INSTANCE) {
readNodeInstance(context, processInstance, processInstance);
}
int exclusiveGroupInstances = context.readInt();
for (int i = 0; i < exclusiveGroupInstances; i++) {
ExclusiveGroupInstance exclusiveGroupInstance = new ExclusiveGroupInstance();
processInstance.addContextInstance(ExclusiveGroup.EXCLUSIVE_GROUP, exclusiveGroupInstance);
int nodeInstances = context.readInt();
for (int j = 0; j < nodeInstances; j++) {
long nodeInstanceId = context.readLong();
NodeInstance nodeInstance = processInstance.getNodeInstance(nodeInstanceId);
if (nodeInstance == null) {
throw new IllegalArgumentException("Could not find node instance when deserializing exclusive group instance: " + nodeInstanceId);
}
exclusiveGroupInstance.addNodeInstance(nodeInstance);
}
}
// Process Variables
// - Number of Variables = keys.size()
// For Each Variable
// - Variable Key
// - Marshalling Strategy Index
// - Marshalled Object
int nbVariables = context.readInt();
if (nbVariables > 0) {
Context variableScope = ((org.jbpm.process.core.Process) process)
.getDefaultContext(VariableScope.VARIABLE_SCOPE);
VariableScopeInstance variableScopeInstance = (VariableScopeInstance) processInstance
.getContextInstance(variableScope);
for (int i = 0; i < nbVariables; i++) {
String name = context.readUTF();
try {
ObjectMarshallingStrategy strategy = null;
int index = context.readInt();
// This is the old way of de/serializing strategy objects
if ( index >= 0 ) {
strategy = context.getResolverStrategyFactory().getStrategy( index );
}
// This is the new way
else if( index == -2 ) {
String strategyClassName = context.readUTF();
if ( ! StringUtils.isEmpty(strategyClassName) ) {
strategy = context.getResolverStrategyFactory().getStrategyObject(strategyClassName);
if( strategy == null ) {
throw new IllegalStateException( "No strategy of type " + strategyClassName + " available." );
}
}
}
// If either way retrieves a strategy, use it
Object value = null;
if( strategy != null ) {
value = strategy.read( (ObjectInputStream) context );
}
variableScopeInstance.internalSetVariable(name, value);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException(
"Could not reload variable " + name);
}
}
}
processInstance.internalSetNodeInstanceCounter(nodeInstanceCounter);
if (wm != null) {
processInstance.reconnect();
}
return processInstance;
}
protected abstract WorkflowProcessInstanceImpl createProcessInstance();
public NodeInstance readNodeInstance(MarshallerReaderContext context,
NodeInstanceContainer nodeInstanceContainer,
WorkflowProcessInstance processInstance) throws IOException {
long id = context.readLong();
long nodeId = context.readLong();
int nodeType = context.readShort();
NodeInstanceImpl nodeInstance = readNodeInstanceContent(nodeType, context, processInstance);
nodeInstance.setNodeId(nodeId);
nodeInstance.setNodeInstanceContainer(nodeInstanceContainer);
nodeInstance.setProcessInstance((org.jbpm.workflow.instance.WorkflowProcessInstance) processInstance);
nodeInstance.setId(id);
switch (nodeType) {
case PersisterEnums.COMPOSITE_NODE_INSTANCE:
case PersisterEnums.DYNAMIC_NODE_INSTANCE:
int nbVariables = context.readInt();
if (nbVariables > 0) {
Context variableScope = ((org.jbpm.process.core.Process) ((org.jbpm.process.instance.ProcessInstance)
processInstance).getProcess()).getDefaultContext(VariableScope.VARIABLE_SCOPE);
VariableScopeInstance variableScopeInstance = (VariableScopeInstance) ((CompositeContextNodeInstance) nodeInstance).getContextInstance(variableScope);
for (int i = 0; i < nbVariables; i++) {
String name = context.readUTF();
try {
Object value = context.readObject();
variableScopeInstance.internalSetVariable(name, value);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Could not reload variable " + name);
}
}
}
while (context.readShort() == PersisterEnums.NODE_INSTANCE) {
readNodeInstance(context,
(CompositeContextNodeInstance) nodeInstance,
processInstance);
}
int exclusiveGroupInstances = context.readInt();
for (int i = 0; i < exclusiveGroupInstances; i++) {
ExclusiveGroupInstance exclusiveGroupInstance = new ExclusiveGroupInstance();
((org.jbpm.process.instance.ProcessInstance) processInstance).addContextInstance(ExclusiveGroup.EXCLUSIVE_GROUP, exclusiveGroupInstance);
int nodeInstances = context.readInt();
for (int j = 0; j < nodeInstances; j++) {
long nodeInstanceId = context.readLong();
NodeInstance groupNodeInstance = processInstance.getNodeInstance(nodeInstanceId);
if (groupNodeInstance == null) {
throw new IllegalArgumentException("Could not find node instance when deserializing exclusive group instance: " + nodeInstanceId);
}
exclusiveGroupInstance.addNodeInstance(groupNodeInstance);
}
}
break;
case PersisterEnums.FOR_EACH_NODE_INSTANCE:
while (context.readShort() == PersisterEnums.NODE_INSTANCE) {
readNodeInstance(context,
(ForEachNodeInstance) nodeInstance,
processInstance);
}
break;
default:
// do nothing
}
return nodeInstance;
}
protected NodeInstanceImpl readNodeInstanceContent(int nodeType, MarshallerReaderContext context, WorkflowProcessInstance processInstance) throws IOException {
NodeInstanceImpl nodeInstance = null;
switch (nodeType) {
case PersisterEnums.RULE_SET_NODE_INSTANCE:
nodeInstance = new RuleSetNodeInstance();
int nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((RuleSetNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.HUMAN_TASK_NODE_INSTANCE:
nodeInstance = new HumanTaskNodeInstance();
((HumanTaskNodeInstance) nodeInstance).internalSetWorkItemId(context.readLong());
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((HumanTaskNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.WORK_ITEM_NODE_INSTANCE:
nodeInstance = new WorkItemNodeInstance();
((WorkItemNodeInstance) nodeInstance).internalSetWorkItemId(context.readLong());
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((WorkItemNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.SUB_PROCESS_NODE_INSTANCE:
nodeInstance = new SubProcessNodeInstance();
((SubProcessNodeInstance) nodeInstance).internalSetProcessInstanceId(context.readLong());
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((SubProcessNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.MILESTONE_NODE_INSTANCE:
nodeInstance = new MilestoneNodeInstance();
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((MilestoneNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.TIMER_NODE_INSTANCE:
nodeInstance = new TimerNodeInstance();
((TimerNodeInstance) nodeInstance).internalSetTimerId(context.readLong());
break;
case PersisterEnums.EVENT_NODE_INSTANCE:
nodeInstance = new EventNodeInstance();
break;
case PersisterEnums.JOIN_NODE_INSTANCE:
nodeInstance = new JoinInstance();
int number = context.readInt();
if (number > 0) {
Map triggers = new HashMap();
for (int i = 0; i < number; i++) {
long l = context.readLong();
int count = context.readInt();
triggers.put(l,
count);
}
((JoinInstance) nodeInstance).internalSetTriggers(triggers);
}
break;
case PersisterEnums.COMPOSITE_NODE_INSTANCE:
nodeInstance = new CompositeContextNodeInstance();
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((CompositeContextNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.FOR_EACH_NODE_INSTANCE:
nodeInstance = new ForEachNodeInstance();
break;
case PersisterEnums.DYNAMIC_NODE_INSTANCE:
nodeInstance = new DynamicNodeInstance();
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((CompositeContextNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
case PersisterEnums.STATE_NODE_INSTANCE:
nodeInstance = new StateNodeInstance();
nbTimerInstances = context.readInt();
if (nbTimerInstances > 0) {
List timerInstances = new ArrayList();
for (int i = 0; i < nbTimerInstances; i++) {
timerInstances.add(context.readLong());
}
((CompositeContextNodeInstance) nodeInstance).internalSetTimerInstances(timerInstances);
}
break;
default:
throw new IllegalArgumentException("Unknown node type: " + nodeType);
}
return nodeInstance;
}
}
