org.camunda.bpm.engine.impl.migration.instance.parser.CompensationEventSubscriptionWalker Maven / Gradle / Ivy
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* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.camunda.bpm.engine.impl.migration.instance.parser;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.camunda.bpm.engine.impl.bpmn.helper.CompensationUtil;
import org.camunda.bpm.engine.impl.migration.instance.MigratingActivityInstance;
import org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity;
import org.camunda.bpm.engine.impl.tree.ReferenceWalker;
import org.camunda.bpm.engine.impl.persistence.entity.EventSubscriptionEntity;
/**
* Ensures that event subscriptions are visited in a top-down fashion, i.e.
* for a compensation handler in a scope that has an event scope execution, it is guaranteed
* that first the scope subscription is visited, and then the compensation handler
*
* @author Thorben Lindhauer
*/
public class CompensationEventSubscriptionWalker extends ReferenceWalker {
public CompensationEventSubscriptionWalker(Collection collection) {
super(collectCompensationEventSubscriptions(collection));
}
protected static List collectCompensationEventSubscriptions(Collection activityInstances) {
List eventSubscriptions = new ArrayList();
for (MigratingActivityInstance activityInstance : activityInstances) {
if (activityInstance.getSourceScope().isScope()) {
ExecutionEntity scopeExecution = activityInstance.resolveRepresentativeExecution();
eventSubscriptions.addAll(scopeExecution.getCompensateEventSubscriptions());
}
}
return eventSubscriptions;
}
@Override
protected Collection nextElements() {
EventSubscriptionEntity eventSubscriptionEntity = getCurrentElement();
ExecutionEntity compensatingExecution = CompensationUtil.getCompensatingExecution(eventSubscriptionEntity);
if (compensatingExecution != null) {
return compensatingExecution.getCompensateEventSubscriptions();
}
else {
return Collections.emptyList();
}
}
}