private void OnStateChanged(object requestor, CancellationToken token, ParserState state, ParserState oldStatus)
{
Interlocked.Increment(ref _stateChangedInvocations);
Logger.Info($"{nameof(RubberduckParserState)} ({_stateChangedInvocations}) is invoking {nameof(StateChanged)} ({Status})");
var highPriorityHandler = StateChangedHighPriority;
if (highPriorityHandler != null && !token.IsCancellationRequested)
{
try
{
var args = new ParserStateEventArgs(state, oldStatus, token);
highPriorityHandler.Invoke(requestor, args);
}
catch (OperationCanceledException cancellation)
{
throw;
}
catch (Exception e)
{
// Error state, because this implies consumers are not exception-safe!
// this behaviour could leave us in a state where some consumers have correctly updated and some have not
Logger.Error(e, "An exception occurred when notifying consumers of updated parser state.");
}
}
var handler = StateChanged;
if (handler != null && !token.IsCancellationRequested)
{
try
{
var args = new ParserStateEventArgs(state, oldStatus, token);
handler.Invoke(requestor, args);
}
catch (OperationCanceledException cancellation)
{
throw;
}
catch (Exception e)
{
// Error state, because this implies consumers are not exception-safe!
// this behaviour could leave us in a state where some consumers have correctly updated and some have not
Logger.Error(e, "An exception occurred when notifying consumers of updated parser state.");
}
}
}