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org.jbpm.workflow.instance.node.EventNodeInstance 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.workflow.instance.node;
import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.core.event.EventTransformer;
import org.jbpm.process.instance.ContextInstance;
import org.jbpm.process.instance.InternalProcessRuntime;
import org.jbpm.process.instance.ProcessInstance;
import org.jbpm.process.instance.context.variable.VariableScopeInstance;
import org.jbpm.process.instance.timer.TimerInstance;
import org.jbpm.process.instance.timer.TimerManager;
import org.jbpm.util.PatternConstants;
import org.jbpm.workflow.core.node.EventNode;
import org.jbpm.workflow.instance.WorkflowProcessInstance;
import org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl;
import org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl;
import org.kie.api.runtime.process.EventListener;
import org.kie.api.runtime.process.NodeInstance;
import org.mvel2.MVEL;
import static org.jbpm.workflow.instance.impl.DummyEventListener.EMPTY_EVENT_LISTENER;
/**
* Runtime counterpart of an event node.
*
*/
public class EventNodeInstance extends ExtendedNodeInstanceImpl implements EventNodeInstanceInterface, EventBasedNodeInstanceInterface {
private static final long serialVersionUID = 510l;
public void signalEvent(String type, Object event) {
if ("timerTriggered".equals(type)) {
TimerInstance timerInstance = (TimerInstance) event;
if (timerInstance.getId() == slaTimerId) {
handleSLAViolation();
}
} else if (("slaViolation:" + getId()).equals(type)) {
handleSLAViolation();
} else {
String variableName = getEventNode().getVariableName();
if (variableName != null) {
VariableScopeInstance variableScopeInstance = (VariableScopeInstance)
resolveContextInstance(VariableScope.VARIABLE_SCOPE, variableName);
if (variableScopeInstance == null) {
throw new IllegalArgumentException(
"Could not find variable for event node: " + variableName);
}
EventTransformer transformer = getEventNode().getEventTransformer();
if (transformer != null) {
event = transformer.transformEvent(event);
}
variableScopeInstance.setVariable(variableName, event);
}
triggerCompleted(type, event);
}
}
protected void triggerCompleted(String type, Object event) {
triggerCompleted();
}
public void internalTrigger(final NodeInstance from, String type) {
if (!org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
throw new IllegalArgumentException(
"An EventNode only accepts default incoming connections!");
}
addEventListeners();
// Do nothing, event activated
}
protected void configureSla() {
String slaDueDateExpression = (String) getNode().getMetaData().get("customSLADueDate");
if (slaDueDateExpression != null) {
TimerInstance timer = ((WorkflowProcessInstanceImpl)getProcessInstance()).configureSLATimer(slaDueDateExpression, getNodeName());
if (timer != null) {
this.slaTimerId = timer.getId();
this.slaDueDate = new Date(System.currentTimeMillis() + timer.getDelay());
this.slaCompliance = ProcessInstance.SLA_PENDING;
logger.debug("SLA for node instance {} is PENDING with due date {}", this.getId(), this.slaDueDate);
}
}
}
protected void handleSLAViolation() {
if (slaCompliance == ProcessInstance.SLA_PENDING) {
InternalProcessRuntime processRuntime = ((InternalProcessRuntime) getProcessInstance().getKnowledgeRuntime().getProcessRuntime());
processRuntime.getProcessEventSupport().fireBeforeSLAViolated(getProcessInstance(), this, getProcessInstance().getKnowledgeRuntime());
logger.debug("SLA violated on node instance {}", getId());
this.slaCompliance = ProcessInstance.SLA_VIOLATED;
this.slaTimerId = -1;
processRuntime.getProcessEventSupport().fireAfterSLAViolated(getProcessInstance(), this, getProcessInstance().getKnowledgeRuntime());
}
}
private void cancelSlaTimer() {
if (this.slaTimerId > -1) {
TimerManager timerManager = ((InternalProcessRuntime)
getProcessInstance().getKnowledgeRuntime().getProcessRuntime()).getTimerManager();
timerManager.cancelTimer(this.slaTimerId);
logger.debug("SLA Timer {} has been canceled", this.slaTimerId);
}
}
protected void addTimerListener() {
((WorkflowProcessInstance) getProcessInstance()).addEventListener("timerTriggered", new VariableExternalEventListener("timerTriggered"), false);
((WorkflowProcessInstance) getProcessInstance()).addEventListener("timer", new VariableExternalEventListener("timer"), true);
((WorkflowProcessInstance) getProcessInstance()).addEventListener("slaViolation:" + getId(), new VariableExternalEventListener("slaViolation"), true);
}
public void removeTimerListeners() {
((WorkflowProcessInstance) getProcessInstance()).removeEventListener("timerTriggered", new VariableExternalEventListener("timerTriggered"), false);
((WorkflowProcessInstance) getProcessInstance()).removeEventListener("timer", new VariableExternalEventListener("timer"), true);
((WorkflowProcessInstance) getProcessInstance()).removeEventListener("slaViolation:" + getId(), new VariableExternalEventListener("slaViolation"), true);
}
public EventNode getEventNode() {
return (EventNode) getNode();
}
public void triggerCompleted() {
getProcessInstance().removeEventListener(getEventType(), getEventListener(), true);
removeTimerListeners();
if (this.slaCompliance == ProcessInstance.SLA_PENDING) {
if (System.currentTimeMillis() > slaDueDate.getTime()) {
// completion of the node instance is after expected SLA due date, mark it accordingly
this.slaCompliance = ProcessInstance.SLA_VIOLATED;
} else {
this.slaCompliance = ProcessInstance.STATE_COMPLETED;
}
}
cancelSlaTimer();
((org.jbpm.workflow.instance.NodeInstanceContainer)getNodeInstanceContainer()).setCurrentLevel(getLevel());
triggerCompleted(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE, true);
}
@Override
public void cancel(CancelType cancelType) {
getProcessInstance().removeEventListener(getEventType(), getEventListener(), true);
removeTimerListeners();
if (this.slaCompliance == ProcessInstance.SLA_PENDING) {
if (System.currentTimeMillis() > slaDueDate.getTime()) {
// completion of the process instance is after expected SLA due date, mark it accordingly
this.slaCompliance = ProcessInstance.SLA_VIOLATED;
} else {
this.slaCompliance = ProcessInstance.SLA_ABORTED;
}
}
removeTimerListeners();
super.cancel(cancelType);
}
private class VariableExternalEventListener implements EventListener, Serializable {
private static final long serialVersionUID = 5L;
private String eventType;
VariableExternalEventListener(String eventType) {
this.eventType = eventType;
}
public String[] getEventTypes() {
return new String[] {eventType};
}
public void signalEvent(String type, Object event) {
callSignal(type, event);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + getOuterType().hashCode();
result = prime * result + ((eventType == null) ? 0 : eventType.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
VariableExternalEventListener other = (VariableExternalEventListener) obj;
if (!getOuterType().equals(other.getOuterType()))
return false;
if (eventType == null) {
if (other.eventType != null)
return false;
} else if (!eventType.equals(other.eventType))
return false;
return true;
}
private EventNodeInstance getOuterType() {
return EventNodeInstance.this;
}
}
@Override
public void addEventListeners() {
String eventType = getEventType();
if (isVariableExpression(getEventNode().getType())) {
getProcessInstance().addEventListener(eventType, new VariableExternalEventListener(eventType), true);
} else {
getProcessInstance().addEventListener(eventType, getEventListener(), true);
}
if (slaTimerId > -1) {
addTimerListener();
}
}
@Override
public void removeEventListeners() {
}
public String getEventType() {
return resolveVariable(getEventNode().getType());
}
protected EventListener getEventListener() {
return EMPTY_EVENT_LISTENER;
}
private boolean isVariableExpression(String eventType) {
if (eventType == null ){
return false;
}
Matcher matcher = PatternConstants.PARAMETER_MATCHER.matcher(eventType);
if (matcher.find()) {
return true;
}
return false;
}
private String resolveVariable(String s) {
if (s == null) {
return null;
}
Map replacements = new HashMap();
Matcher matcher = PatternConstants.PARAMETER_MATCHER.matcher(s);
while (matcher.find()) {
String paramName = matcher.group(1);
if (replacements.get(paramName) == null) {
VariableScopeInstance variableScopeInstance = (VariableScopeInstance) resolveContextInstance(VariableScope.VARIABLE_SCOPE, paramName);
if (variableScopeInstance != null) {
Object variableValue = variableScopeInstance.getVariable(paramName);
String variableValueString = variableValue == null ? "" : variableValue.toString();
replacements.put(paramName, variableValueString);
} else {
List ctxIntances = resolveContextInstance(VariableScope.VARIABLE_SCOPE);
for(ContextInstance ci : ctxIntances) {
VariableScopeInstance vsi = (VariableScopeInstance) ci;
try {
Object eval = MVEL.eval(paramName, vsi.getVariables());
replacements.put(paramName, eval.toString());
break;
} catch (Exception e) {
// do nothing. errors here is because paramName is not an expression
}
}
}
}
}
for (Map.Entry replacement: replacements.entrySet()) {
s = s.replace("#{" + replacement.getKey() + "}", replacement.getValue());
}
return s;
}
private void callSignal(String type, Object event) {
signalEvent(type, event);
}
}
