/// <summary>
/// Implements consistent transition between states. Throws IllegalStateException if an invalid transition is attempted.
/// </summary>
/// <param name="fromState">State being transitioning from</param>
/// <param name="toState">State being transitioned to</param>
/// <exception cref="IllegalStateException">
/// This exception is thrown if an invalid transition is attempted from <paramref name="fromState"/> to <paramref name="toState"/>.
/// </exception>
private void Transition(AtomicState fromState, AtomicState toState)
{
if (SwapState(fromState, toState))
{
Debug.WriteLine("Successful transition from {0} to {1}", fromState, toState);
toState.Enter();
}
// else some other thread already swapped state
}
/// <summary>
/// Implements consistent transition between states. Throws IllegalStateException if an invalid transition is attempted.
/// </summary>
/// <param name="fromState">State being transitioning from</param>
/// <param name="toState">State being transitioned to</param>
/// <exception cref="IllegalStateException">
/// This exception is thrown if an invalid transition is attempted from <paramref name="fromState"/> to <paramref name="toState"/>.
/// </exception>
private void Transition(AtomicState fromState, AtomicState toState)
{
if (SwapState(fromState, toState))
{
Debug.WriteLine("Successful transition from {0} to {1}", fromState, toState);
toState.Enter();
}
else
{
throw new IllegalStateException($"Illegal transition attempted from {fromState} to {toState}");
}
}