code: @Override
      public synchronized FailureScope currentFailureScope() {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "currentFailureScope", this);
  
          if (_currentFailureScope == null) {
              _currentFailureScope = new FileFailureScope();
          }
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "currentFailureScope", _currentFailureScope);
          return _currentFailureScope;
      }
docs: Invoked by a client service to determine the "current" FailureScope. This is
  defined as a FailureScope that identifies the current point of execution. In
  practice this means the current server on distributed or server region on 390.
  
  @return FailureScope The current FailureScope.