public void stopSync() throws InterruptedException {
        bossGroup.shutdownGracefully().sync();
        workerGroup.shutdownGracefully().sync();
    }
A Simple Netty Server intended to be used as a base for gremlin test servers.
Server behavior is defined by the {@link ChannelInitializer} passed in the start method.
gremlin-tools/gremlin-socket-server/src/main/java/org/apache/tinkerpop/gremlin/socket/server/SimpleSocketServer.java