/// <summary>
/// Actual implementation of leaving an activity.
/// </summary>
/// <param name="execution">
/// The current execution context
/// </param>
/// <param name="checkConditions">
/// Whether or not to check conditions before determining whether or
/// not to take a transition.
/// </param>
/// <param name="throwExceptionIfExecutionStuck">
/// If true, an <seealso cref="ProcessEngineException" /> will be thrown in case no
/// transition could be found to leave the activity.
/// </param>
protected internal virtual void PerformOutgoingBehavior(IActivityExecution execution, bool checkConditions,
bool throwExceptionIfExecutionStuck, IList <IActivityExecution> reusableExecutions)
{
Log.LeavingActivity(execution.Activity.Id);
var defaultSequenceFlow = (string)execution.Activity.GetProperty("default");
IList <IPvmTransition> transitionsToTake = new List <IPvmTransition>();
IList <IPvmTransition> outgoingTransitions = execution.Activity.OutgoingTransitions;
foreach (IPvmTransition outgoingTransition in outgoingTransitions)
{
if (defaultSequenceFlow == null || outgoingTransition.Id != defaultSequenceFlow)
{
var condition = (ICondition)outgoingTransition.GetProperty(BpmnParse.PropertynameCondition);
if ((condition == null) || !checkConditions || condition.Evaluate(execution))
{
transitionsToTake.Add(outgoingTransition);
}
}
}
if (transitionsToTake.Count == 1)
{
execution.LeaveActivityViaTransition(transitionsToTake.ElementAt(0));
}
else if (transitionsToTake.Count >= 1)
{
if (reusableExecutions == null || reusableExecutions.Count == 0)
{
execution.LeaveActivityViaTransitions(transitionsToTake, new List <IActivityExecution>()
{
execution
});
}
else
{
execution.LeaveActivityViaTransitions(transitionsToTake, reusableExecutions);
}
}
else
{
//if (!ReferenceEquals(defaultSequenceFlow, null))
if (!string.IsNullOrEmpty(defaultSequenceFlow))
{
var defaultTransition = execution.Activity.FindOutgoingTransition(defaultSequenceFlow);
if (defaultTransition != null)
{
execution.LeaveActivityViaTransition(defaultTransition);
}
else
{
throw Log.MissingDefaultFlowException(execution.Activity.Id, defaultSequenceFlow);
}
}
else if (outgoingTransitions.Count > 0)
{
throw Log.MissingConditionalFlowException(execution.Activity.Id);
}
else
{
if (((ActivityImpl)execution.Activity).CompensationHandler &&
IsAncestorCompensationThrowing(execution))
{
execution.EndCompensation();
}
else
{
Log.MissingOutgoingSequenceFlow(execution.Activity.Id);
execution.End(true);
if (throwExceptionIfExecutionStuck)
{
throw Log.StuckExecutionException(execution.Activity.Id);
}
}
}
}
}
