/// <summary>
/// Does any processing after a transition occurs.
/// </summary>
protected virtual void OnAfterTransition(OperationContext context, Transition transition, QualifiedName cause)
{
// raise a notification that a transition has occurred.
if (m_TransitionCompleted != null)
{
StateMachineTransitionEventArgs args = new StateMachineTransitionEventArgs(
transition.FromState.BrowseName,
transition.ToState.BrowseName,
cause);
m_TransitionCompleted(context, this, args);
}
}
/// <summary>
/// Does any processing before a transition occurs.
/// </summary>
protected virtual void OnBeforeTransition(OperationContext context, Transition transition, QualifiedName cause)
{
// raise a notification that a transition is about to occur.
if (m_TransitionInitiated != null)
{
StateMachineTransitionEventArgs args = new StateMachineTransitionEventArgs(transition.FromState.BrowseName, transition.ToState.BrowseName, cause);
m_TransitionInitiated(context, this, args);
if (args.Cancel)
{
throw ServiceResultException.Create(StatusCodes.Bad, "Transition to State '{0}' was cancelled because: '{1}'.", transition.ToState.DisplayName, args.CancelReason);
}
}
}
/// <summary>
/// Does any processing after a transition occurs.
/// </summary>
protected virtual void OnAfterTransition(OperationContext context, Transition transition, QualifiedName cause)
{
// raise a notification that a transition has occurred.
if (m_TransitionCompleted != null)
{
StateMachineTransitionEventArgs args = new StateMachineTransitionEventArgs(
transition.FromState.BrowseName,
transition.ToState.BrowseName,
cause);
m_TransitionCompleted(context, this, args);
}
}
/// <summary>
/// Does any processing before a transition occurs.
/// </summary>
protected virtual void OnBeforeTransition(OperationContext context, Transition transition, QualifiedName cause)
{
// raise a notification that a transition is about to occur.
if (m_TransitionInitiated != null)
{
StateMachineTransitionEventArgs args = new StateMachineTransitionEventArgs(transition.FromState.BrowseName, transition.ToState.BrowseName, cause);
m_TransitionInitiated(context, this, args);
if (args.Cancel)
{
throw ServiceResultException.Create(StatusCodes.Bad, "Transition to State '{0}' was cancelled because: '{1}'.", transition.ToState.DisplayName, args.CancelReason);
}
}
}
/// <summary>
/// Called when the program changes state.
/// </summary>
public void Simulation_TransitionInitiated(OperationContext context, StateMachine machine, StateMachineTransitionEventArgs e)
{
lock (DataLock)
{
switch (e.ToState.Name)
{
case Opc.Ua.BrowseNames.Ready:
{
if (m_timer != null)
{
m_timer.Dispose();
m_timer = null;
}
break;
}
case Opc.Ua.BrowseNames.Suspended:
case Opc.Ua.BrowseNames.Halted:
{
if (m_timer != null)
{
m_timer.Dispose();
m_timer = null;
}
break;
}
case Opc.Ua.BrowseNames.Running:
{
OnStartSimulation();
break;
}
}
}
}
