public Builder withThreads(int threads){
  properties.setProperty(NettyOptions.THREADS,String.valueOf(Assert.argNot(threads,threads <= 0,"threads must be positive")));
  return this;
}

public Builder withThreads ( int threads ) { properties . setProperty ( NettyOptions . THREADS , String . valueOf ( Assert . argNot ( threads , threads <= 0 , "threads must be positive" ) ) ) ; return this ; }
sets the number of netty event loop threads .
