code: public void subscribe (DObjectManager omgr)
      {
          if (_active) {
              log.warning("Active safesub asked to resubscribe " + this + ".", new Exception());
              return;
          }
  
          // note that we are now again in the "wishing to be subscribed" state
          _active = true;
  
          // make sure we dont have an object reference (which should be
          // logically impossible)
          if (_object != null) {
              log.warning("Incroyable! A safesub has an object and was " +
                          "non-active!? " + this + ".", new Exception());
              // make do in the face of insanity
              _subscriber.objectAvailable(_object);
              return;
          }
  
          if (_pending) {
              // we were previously asked to subscribe, then they asked to
              // unsubscribe and now they've asked to subscribe again, all
              // before the original subscription even completed; we need do
              // nothing here except as the original subscription request
              // will eventually come through and all will be well
              return;
          }
  
          // we're not pending and we just became active, that means we need
          // to request to subscribe to our object
          _pending = true;
          omgr.subscribeToObject(_oid, this);
      }
docs: Initiates the subscription process.