code: SimpleProxyId<BaseProxy> getId(final IdMessage op) {
      if (Strength.SYNTHETIC.equals(op.getStrength())) {
        return this.allocateSyntheticId(op.getTypeToken(), op.getSyntheticId());
      }
      return this.state.requestFactory.getId(op.getTypeToken(), op.getServerId(), op.getClientId());
    }
docs: Resolves an IdMessage into an SimpleProxyId.