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/*
* 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.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.instance.context.variable.VariableScopeInstance;
import org.jbpm.workflow.core.node.AsyncEventNode;
import org.jbpm.workflow.core.node.Join;
import org.jbpm.workflow.core.node.Split;
import org.jbpm.workflow.instance.impl.NodeInstanceImpl;
import org.kie.api.definition.process.Connection;
import org.kie.api.definition.process.Node;
import org.kie.api.runtime.process.NodeInstance;
import org.kie.api.runtime.process.NodeInstanceContainer;
/**
* Runtime counterpart of a join node.
*
*/
public class JoinInstance extends NodeInstanceImpl {
private static final long serialVersionUID = 510l;
private Map triggers = new HashMap();
protected Join getJoin() {
return (Join) getNode();
}
public void internalTrigger(final NodeInstance from, String type) {
if (!org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
throw new IllegalArgumentException(
"An ActionNode only accepts default incoming connections!");
}
final Join join = getJoin();
switch ( join.getType() ) {
case Join.TYPE_XOR :
triggerCompleted();
break;
case Join.TYPE_AND :
Integer count = (Integer) this.triggers.get( from.getNodeId() );
if ( count == null ) {
this.triggers.put( from.getNodeId(),
1 );
} else {
this.triggers.put( from.getNodeId(),
count.intValue() + 1 );
}
if (checkAllActivated()) {
decreaseAllTriggers();
triggerCompleted();
}
break;
case Join.TYPE_DISCRIMINATOR :
boolean triggerCompleted = triggers.isEmpty();
triggers.put( from.getNodeId(), new Integer( 1 ) );
if (checkAllActivated()) {
resetAllTriggers();
}
if (triggerCompleted) {
triggerCompleted();
}
break;
case Join.TYPE_N_OF_M :
count = (Integer) this.triggers.get( from.getNodeId() );
if ( count == null ) {
this.triggers.put( from.getNodeId(),
1 );
} else {
this.triggers.put( from.getNodeId(),
count.intValue() + 1 );
}
int counter = 0;
for (final Connection connection: getJoin().getDefaultIncomingConnections()) {
if ( this.triggers.get( connection.getFrom().getId() ) != null ) {
counter++;
}
}
String n = join.getN();
Integer number = null;
if (n.startsWith("#{") && n.endsWith("}")) {
n = n.substring(2, n.length() - 1);
VariableScopeInstance variableScopeInstance = (VariableScopeInstance)
resolveContextInstance(VariableScope.VARIABLE_SCOPE, n);
if (variableScopeInstance == null) {
throw new IllegalArgumentException(
"Could not find variable " + n + " when executing join.");
}
Object value = variableScopeInstance.getVariable(n);
if (value instanceof Number) {
number = ((Number) value).intValue();
} else {
throw new IllegalArgumentException(
"Variable " + n + " did not return a number when executing join: " + value);
}
} else {
number = new Integer(n);
}
if (counter >= number) {
resetAllTriggers();
triggerCompleted();
}
break;
case Join.TYPE_OR :
NodeInstanceContainer nodeInstanceContainer = (NodeInstanceContainer) getNodeInstanceContainer();
boolean activePathExists = existsActiveDirectFlow(nodeInstanceContainer, getJoin());
if (!activePathExists ) {
triggerCompleted();
}
break;
default :
throw new IllegalArgumentException( "Illegal join type " + join.getType() );
}
}
private boolean checkAllActivated() {
// check whether all parent nodes have been triggered
for (final Connection connection: getJoin().getDefaultIncomingConnections()) {
if ( this.triggers.get( connection.getFrom().getId() ) == null ) {
return false;
}
}
return true;
}
private void decreaseAllTriggers() {
// decrease trigger count for all incoming connections
for (final Connection connection: getJoin().getDefaultIncomingConnections()) {
final Integer count = (Integer) this.triggers.get( connection.getFrom().getId() );
if ( count.intValue() == 1 ) {
this.triggers.remove( connection.getFrom().getId() );
} else {
this.triggers.put( connection.getFrom().getId(),
count.intValue() - 1 );
}
}
}
private boolean existsActiveDirectFlow(NodeInstanceContainer nodeInstanceContainer, final Node lookFor) {
Collection activeNodeInstancesOrig = nodeInstanceContainer.getNodeInstances();
List activeNodeInstances = new ArrayList(activeNodeInstancesOrig);
// sort active instances in the way that lookFor nodeInstance will be last to not finish too early
Collections.sort(activeNodeInstances, new Comparator() {
@Override
public int compare(NodeInstance o1, NodeInstance o2) {
if (o1.getNodeId() == lookFor.getId()) {
return 1;
} else if (o2.getNodeId() == lookFor.getId()) {
return -1;
}
return 0;
}
});
for (NodeInstance nodeInstance : activeNodeInstances) {
// do not consider NodeInstanceContainers to be checked, enough to treat is as black box
if (((org.jbpm.workflow.instance.NodeInstance)nodeInstance).getLevel() != getLevel()) {
continue;
}
Node node = nodeInstance.getNode();
Set vistedNodes = new HashSet();
checkNodes(vistedNodes,node, node, lookFor);
if (vistedNodes.contains(lookFor.getId()) && !vistedNodes.contains(node.getId())) {
return true;
}
}
return false;
}
private boolean checkNodes(Set vistedNodes, Node startAt, Node currentNode, Node lookFor) {
if (currentNode == null) {
// for dynamic/ad hoc task there is no node
return false;
}
if (currentNode instanceof AsyncEventNode) {
currentNode = ((AsyncEventNode) currentNode).getActualNode();
}
List connections = currentNode.getOutgoingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
// special handling for XOR split as it usually is used for arbitrary loops
if (currentNode instanceof Split && ((Split) currentNode).getType() == Split.TYPE_XOR) {
if (vistedNodes.contains(startAt.getId())) {
return false;
}
for (Connection conn : connections) {
Set xorCopy = new HashSet(vistedNodes);
Node nextNode = conn.getTo();
if (nextNode == null) {
continue;
} else {
xorCopy.add(nextNode.getId());
if (nextNode.getId() != lookFor.getId()) {
checkNodes(xorCopy, currentNode, nextNode, lookFor);
}
}
if (xorCopy.contains(lookFor.getId())) {
vistedNodes.addAll(xorCopy);
return true;
}
}
} else {
for (Connection conn : connections) {
Node nextNode = conn.getTo();
if (nextNode == null) {
continue;
} else {
if (vistedNodes.contains(nextNode.getId())) {
// we have already been here so let's continue
continue;
}
if (nextNode.getId() == lookFor.getId()) {
// we found the node that we are looking for, add it and continue to find out other parts
// as it could be part of a loop
vistedNodes.add(nextNode.getId());
continue;
}
vistedNodes.add(nextNode.getId());
if (startAt.getId() == nextNode.getId()) {
return true;
} else {
boolean nestedCheck = checkNodes(vistedNodes, startAt, nextNode, lookFor);
if (nestedCheck) {
return true;
}
}
}
}
}
return false;
}
private void resetAllTriggers() {
triggers.clear();
}
public void triggerCompleted() {
// join nodes are only removed from the container when they contain no more state
triggerCompleted(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE, triggers.isEmpty());
}
public Map getTriggers() {
return triggers;
}
public void internalSetTriggers(Map triggers) {
this.triggers = triggers;
}
}
