code: public void fireServiceActivated() {
          if (!activated.compareAndSet(false, true)) {
              return;
          }
  
          activationTime = System.currentTimeMillis();
  
          for (IoServiceListener l : listeners) {
              try {
                  l.serviceActivated(service);
              } catch (Throwable e) {
                  ExceptionMonitor.getInstance().exceptionCaught(e);
              }
          }
      }
docs: Calls {@link IoServiceListener#serviceActivated(IoService)}
  for all registered listeners.