private void WaitForGameState(EngineGameState target)
{
// Immediately returns if the engine is in the target state,
// or if the engine has previously crashed.
lock (_SyncRoot)
{
if (_IsInCrash)
{
return;
}
}
try
{
CheckStateIs(target, null);
// If we get here, it means that the engine is in the target state.
return;
}
catch (InvalidOperationException)
{
// The engine is performing a concurrent operation.
// Let's keep on going.
}
// Sets up a manual reset event that is set when the engine state
// changes to the target game state.
System.Threading.ManualResetEvent resetEvent = new System.Threading.ManualResetEvent(false);
PropertyChangedEventHandler handler = new PropertyChangedEventHandler((o, e) =>
{
if (e.PropertyName == "GameState")
{
try
{
CheckStateIs(target, null);
// The engine is not in a concurrent game operation.
// Let's signal the event.
resetEvent.Set();
}
catch (InvalidOperationException)
{
// The engine is performing a concurrent operation.
// Let's wait some more.
return;
}
}
});
PropertyChanged += handler;
// Waits on the event.
resetEvent.WaitOne();
// Removes the handler.
PropertyChanged -= handler;
}
#endregion
