public override Void execute(CommandContext commandContext)
{
ExecutionEntity sourceInstanceExecution = determineSourceInstanceExecution(commandContext);
// Outline:
// 1. find topmost scope execution beginning at scopeExecution that has exactly
// one child (this is the topmost scope we can cancel)
// 2. cancel all children of the topmost execution
// 3. cancel the activity of the topmost execution itself (if applicable)
// 4. remove topmost execution (and concurrent parent) if topmostExecution is not the process instance
ExecutionEntity topmostCancellableExecution = sourceInstanceExecution;
ExecutionEntity parentScopeExecution = (ExecutionEntity)topmostCancellableExecution.getParentScopeExecution(false);
// if topmostCancellableExecution's scope execution has no other non-event-scope children,
// we have reached the correct execution
while (parentScopeExecution != null && (parentScopeExecution.NonEventScopeExecutions.Count <= 1))
{
topmostCancellableExecution = parentScopeExecution;
parentScopeExecution = (ExecutionEntity)topmostCancellableExecution.getParentScopeExecution(false);
}
if (topmostCancellableExecution.PreserveScope)
{
topmostCancellableExecution.interrupt(cancellationReason, skipCustomListeners, skipIoMappings);
topmostCancellableExecution.leaveActivityInstance();
topmostCancellableExecution.setActivity(null);
}
else
{
topmostCancellableExecution.deleteCascade(cancellationReason, skipCustomListeners, skipIoMappings);
ModificationUtil.handleChildRemovalInScope(topmostCancellableExecution);
}
return(null);
}
public static void handleChildRemovalInScope(ExecutionEntity removedExecution)
{
ActivityImpl activity = removedExecution.getActivity();
if (activity == null)
{
if (removedExecution.getSuperExecution() != null)
{
removedExecution = removedExecution.getSuperExecution();
activity = removedExecution.getActivity();
if (activity == null)
{
return;
}
}
else
{
return;
}
}
ScopeImpl flowScope = activity.FlowScope;
PvmExecutionImpl scopeExecution = removedExecution.getParentScopeExecution(false);
PvmExecutionImpl executionInParentScope = removedExecution.Concurrent ? removedExecution : removedExecution.Parent;
if (flowScope.ActivityBehavior != null && flowScope.ActivityBehavior is ModificationObserverBehavior)
{
// let child removal be handled by the scope itself
ModificationObserverBehavior behavior = (ModificationObserverBehavior)flowScope.ActivityBehavior;
behavior.destroyInnerInstance(executionInParentScope);
}
else
{
if (executionInParentScope.Concurrent)
{
executionInParentScope.remove();
scopeExecution.tryPruneLastConcurrentChild();
scopeExecution.forceUpdate();
}
}
}