docs: private void _initializeInbox() {
          synchronized (inboxControllerLock) {
              if (this.ctInboxController != null) {
                  _notifyInboxInitialized();
                  return;
              }
              this.ctInboxController = new CTInboxController(getCleverTapID(), loadDBAdapter(context), haveVideoPlayerSupport);
              _notifyInboxInitialized();
          }
      }