/// <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); } } } } }