/* 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.activiti.engine.impl.bpmn.helper;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.persistence.entity.CompensateEventSubscriptionEntity;
import org.activiti.engine.impl.persistence.entity.EventSubscriptionEntity;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.pvm.PvmProcessDefinition;
import org.activiti.engine.impl.pvm.PvmScope;
import org.activiti.engine.impl.pvm.delegate.ActivityBehavior;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.pvm.runtime.InterpretableExecution;
/**
* @author Daniel Meyer
* @author Nico Rehwaldt
*/
public class ScopeUtil {
/**
* Find the next scope execution in the parent execution hierarchy
* That method works different than {@link #findScopeExecutionForScope(org.activiti.engine.impl.persistence.entity.ExecutionEntity, org.activiti.engine.impl.pvm.PvmScope)}
* which returns the most outer scope execution.
*
* @param execution the execution from which to start the search
* @return the next scope execution in the parent execution hierarchy
*/
public static ActivityExecution findScopeExecution(ActivityExecution execution) {
while(!execution.isScope()) {
execution = execution.getParent();
}
if(execution.isConcurrent()) {
execution = execution.getParent();
}
return execution;
}
/**
* returns the top-most execution sitting in an activity part of the scope defined by 'scopeActivitiy'.
*/
public static ExecutionEntity findScopeExecutionForScope(ExecutionEntity execution, PvmScope scopeActivity) {
// TODO: this feels hacky!
if (scopeActivity instanceof PvmProcessDefinition) {
return execution.getProcessInstance();
} else {
ActivityImpl currentActivity = execution.getActivity();
ExecutionEntity candiadateExecution = null;
ExecutionEntity originalExecution = execution;
while (execution != null) {
currentActivity = execution.getActivity();
if (scopeActivity.getActivities().contains(currentActivity) /* does not search rec*/
|| scopeActivity.equals(currentActivity)) {
// found a candidate execution; lets still check whether we find an
// execution which is also sitting in an activity part of this scope
// higher up the hierarchy
candiadateExecution = execution;
} else if (currentActivity!= null
&& currentActivity.contains((ActivityImpl)scopeActivity) /*searches rec*/) {
// now we're too "high", the candidate execution is the one.
break;
}
execution = execution.getParent();
}
// if activity is scope, we need to get the parent at least:
if(originalExecution == candiadateExecution
&& originalExecution.getActivity().isScope()
&& !originalExecution.getActivity().equals(scopeActivity)) {
candiadateExecution = originalExecution.getParent();
}
return candiadateExecution;
}
}
public static ActivityImpl findInParentScopesByBehaviorType(ActivityImpl activity, Class<? extends ActivityBehavior> behaviorType) {
while (activity != null) {
for (ActivityImpl childActivity : activity.getActivities()) {
if(behaviorType.isAssignableFrom(childActivity.getActivityBehavior().getClass())) {
return childActivity;
}
}
activity = activity.getParentActivity();
}
return null;
}
/**
* we create a separate execution for each compensation handler invocation.
*/
public static void throwCompensationEvent(List<CompensateEventSubscriptionEntity> eventSubscriptions, ActivityExecution execution, boolean async) {
// first spawn the compensating executions
for (EventSubscriptionEntity eventSubscription : eventSubscriptions) {
ExecutionEntity compensatingExecution = null;
// check whether compensating execution is already created
// (which is the case when compensating an embedded subprocess,
// where the compensating execution is created when leaving the subprocess
// and holds snapshot data).
if(eventSubscription.getConfiguration() !=null) {
compensatingExecution = Context.getCommandContext()
.getExecutionManager()
.findExecutionById(eventSubscription.getConfiguration());
// move the compensating execution under this execution:
compensatingExecution.setParent((InterpretableExecution) execution);
compensatingExecution.setEventScope(false);
} else {
compensatingExecution = (ExecutionEntity) execution.createExecution();
eventSubscription.setConfiguration(compensatingExecution.getId());
}
compensatingExecution.setConcurrent(true);
}
// signal compensation events in reverse order of their 'created' timestamp
Collections.sort(eventSubscriptions, new Comparator<EventSubscriptionEntity>() {
public int compare(EventSubscriptionEntity o1, EventSubscriptionEntity o2) {
return o2.getCreated().compareTo(o1.getCreated());
}
});
for (CompensateEventSubscriptionEntity compensateEventSubscriptionEntity : eventSubscriptions) {
compensateEventSubscriptionEntity.eventReceived(null, async);
}
}
/**
* creates an event scope for the given execution:
*
* create a new event scope execution under the parent of the given
* execution and move all event subscriptions to that execution.
*
* this allows us to "remember" the event subscriptions after finishing a
* scope
*/
public static void createEventScopeExecution(ExecutionEntity execution) {
ExecutionEntity eventScope = ScopeUtil.findScopeExecutionForScope(execution, execution.getActivity().getParent());
List<CompensateEventSubscriptionEntity> eventSubscriptions = execution.getCompensateEventSubscriptions();
if(eventSubscriptions.size() > 0) {
ExecutionEntity eventScopeExecution = eventScope.createExecution();
eventScopeExecution.setActive(false);
eventScopeExecution.setConcurrent(false);
eventScopeExecution.setEventScope(true);
eventScopeExecution.setActivity((ActivityImpl) execution.getActivity());
execution.setConcurrent(false);
// copy local variables to eventScopeExecution by value. This way,
// the eventScopeExecution references a 'snapshot' of the local variables
Map<String, Object> variables = execution.getVariablesLocal();
for (Entry<String, Object> variable : variables.entrySet()) {
eventScopeExecution.setVariableLocal(variable.getKey(), variable.getValue());
}
// set event subscriptions to the event scope execution:
for (CompensateEventSubscriptionEntity eventSubscriptionEntity : eventSubscriptions) {
eventSubscriptionEntity = eventSubscriptionEntity.moveUnder(eventScopeExecution);
}
CompensateEventSubscriptionEntity eventSubscription = CompensateEventSubscriptionEntity.createAndInsert(eventScope);
eventSubscription.setActivity(execution.getActivity());
eventSubscription.setConfiguration(eventScopeExecution.getId());
}
}
}