Fix ClassCastException in SensoryEventResponseHandler

[mltheuser]

🐛 Problem

A ClassCastException was thrown in production when the SensoryEventResponseHandler received a TransitionFailed event while awaiting a specific event via the NotifyOnEvent reaction.

Exception:

class com.ing.baker.runtime.akka.actor.process_instance.ProcessInstanceProtocol$TransitionFailed 
cannot be cast to class com.ing.baker.runtime.akka.actor.process_instance.ProcessInstanceProtocol$TransitionFired

🔍 Cause

In the streaming method, the guard condition for NotifyOnEvent blindly cast cache.head to TransitionFired without checking the actual type. When an interaction fails and a TransitionFailed event is added to the cache, the subsequent check causes a crash.

🛠️ Fix

Replaced the unsafe asInstanceOf cast with pattern matching that safely handles both TransitionFired and TransitionFailed events.

Before (Unsafe)

if (Option(cache.head.asInstanceOf[TransitionFired].output.asInstanceOf[EventInstance]).exists(_.name == onEvent))

After (Safe)

if (cache.head match {
  case fired: TransitionFired => Option(fired.output).collect { case e: EventInstance => e }.exists(_.name == onEvent)
  case _ => false
})

🧪 Testing

• Added a regression test that verifies TransitionFailed events are handled gracefully without crashing the handler.