private void SysMsgInvokeAll(EarliestFirstSystemMessageList messages, int currentState)
{
var nextState = currentState;
var todo = messages;
while(true)
{
var m = todo.Head;
todo = messages.Tail;
m.Unlink();
try
{
// TODO: replace with direct cast
if (ShouldStash(m, nextState))
{
Stash(m);
}
if (m is ActorTaskSchedulerMessage) HandleActorTaskSchedulerMessage((ActorTaskSchedulerMessage)m);
else if (m is Failed) HandleFailed(m as Failed);
else if (m is DeathWatchNotification)
{
var msg = m as DeathWatchNotification;
WatchedActorTerminated(msg.Actor, msg.ExistenceConfirmed, msg.AddressTerminated);
}
else if (m is Create) Create((m as Create).Failure);
else if (m is Watch)
{
var watch = m as Watch;
AddWatcher(watch.Watchee, watch.Watcher);
}
else if (m is Unwatch)
{
var unwatch = m as Unwatch;
RemWatcher(unwatch.Watchee, unwatch.Watcher);
}
else if (m is Recreate) FaultRecreate((m as Recreate).Cause);
else if (m is Suspend) FaultSuspend();
else if (m is Resume) FaultResume((m as Resume).CausedByFailure);
else if (m is Terminate) Terminate();
else if (m is Supervise)
{
var supervise = m as Supervise;
Supervise(supervise.Child, supervise.Async);
}
else
{
throw new NotSupportedException($"Unknown message {m.GetType().Name}");
}
}
catch (Exception cause)
{
HandleInvokeFailure(cause);
}
nextState = CalculateState();
// As each state accepts a strict subset of another state, it is enough to unstash if we "walk up" the state
// chain
todo = nextState < currentState ? todo + UnstashAll() : todo;
if (IsTerminated)
{
SendAllToDeadLetters(todo);
return;
}
if (todo.IsEmpty) return; // keep running until the stash is empty
}
}
private void SendAllToDeadLetters(EarliestFirstSystemMessageList messages)
{
if (messages.IsEmpty) return; // don't run any of this if there are no system messages
do
{
var msg = messages.Head;
messages = messages.Tail;
msg.Unlink();
SystemImpl.Provider.DeadLetters.Tell(msg, Self);
} while (messages.NonEmpty);
}