/// <summary>
/// Cancel active transition.
/// Returns tokens to input places if the transition has been STARTED.
/// </summary>
/// <param name="correlationId"></param>
private void CancelTransition(string correlationId)
{
TaskShell at = GetActiveTransition(correlationId);
if (at == null) throw new Exception("Invalid correlation Id");
log.Info("Cancelling transition {0}", at.ToString());
if (at.Status != TransitionStatus.ENABLED && at.Status != TransitionStatus.STARTED) throw new Exception("Invalid transition status");
if (at.Status == TransitionStatus.STARTED)
{
//return tokens to input places
foreach (string plid in at.AllocatedPlaces)
{
AddToken(plid);
}
}
at.CancelTask();
at.Status = TransitionStatus.CANCELLED;
ActiveTransitionCancelled ac = new ActiveTransitionCancelled();
ac.CorrelationId = at.CorrelationId;
ac.DefinitionId = ProcessDefinitionId;
ac.InstanceId = InstanceId;
ac.TaskId = at.TaskId;
ac.TaskType = Definition.GetTask(at.TaskId).GetType().Name;
NotifyProcessEvent(ac);
}
/// <summary>
/// Cancel active transition instance
/// How do we do that?
/// 1. Do activity-specific cancellation
/// 2. Update status of each input token: if it has no more enabled transitions, put it into READY state. Otherwise, leave it in WAITING_TASK
/// </summary>
/// <param name="at"></param>
private void CancelActiveTransition(TaskShell at)
{
log.Info("Cancelling transition {0}", at.CorrelationId);
if (at.IsImmediate) throw new Exception("Cannot cancel an immediate transition");
if (at.Status != TransitionStatus.ENABLED && at.Status != TransitionStatus.STARTED) throw new Exception("Invalid transition status");
at.CancelTask();
Debug.Assert(at.Status == TransitionStatus.CANCELLED);
foreach (string t in at.Tokens)
{
Token tok = GetToken(t);
Debug.Assert(tok.Status == TokenStatus.LOCKED_ENABLED || tok.Status == TokenStatus.LOCKED_ALLOCATED);
Debug.Assert(tok.ActiveTransitions.Contains(at.CorrelationId));
if (!tok.ActiveTransitions.Remove(at.CorrelationId)) throw new Exception("Error removing transition id from token"); //should never happen
if (tok.ActiveTransitions.Count == 0)
{
tok.Status = TokenStatus.READY;
}
}
ActiveTransitionCancelled ac = new ActiveTransitionCancelled();
ac.CorrelationId = at.CorrelationId;
ac.DefinitionId = ProcessDefinitionId;
ac.InstanceId = InstanceId;
ac.TaskId = at.TaskId;
ac.TaskType = Definition.GetTask(at.TaskId).GetType().Name;
NotifyProcessEvent(ac);
}
