import org.apache.cassandra.auth.ISaslAwareAuthenticator; //导入依赖的package包/类
private void run()
{
    // Check that a SaslAuthenticator can be provided by the configured
    // IAuthenticator. If not, don't start the server.
    IAuthenticator authenticator = DatabaseDescriptor.getAuthenticator();
    if (authenticator.requireAuthentication() && !(authenticator instanceof ISaslAwareAuthenticator))
    {
        logger.error("Not starting native transport as the configured IAuthenticator is not capable of SASL authentication");
        isRunning.compareAndSet(true, false);
        return;
    }

    // Configure the server.
    executionHandler = new ExecutionHandler(new RequestThreadPoolExecutor());
    factory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
    ServerBootstrap bootstrap = new ServerBootstrap(factory);

    bootstrap.setOption("child.tcpNoDelay", true);

    // Set up the event pipeline factory.
    final EncryptionOptions.ClientEncryptionOptions clientEnc = DatabaseDescriptor.getClientEncryptionOptions();
    if (clientEnc.enabled)
    {
        logger.info("Enabling encrypted CQL connections between client and server");
        bootstrap.setPipelineFactory(new SecurePipelineFactory(this, clientEnc));
    }
    else
    {
        bootstrap.setPipelineFactory(new PipelineFactory(this));
    }

    // Bind and start to accept incoming connections.
    logger.info("Starting listening for CQL clients on {}...", socket);
    Channel channel = bootstrap.bind(socket);
    connectionTracker.allChannels.add(channel);
}
 

import org.apache.cassandra.auth.ISaslAwareAuthenticator; //导入依赖的package包/类
private void run()
{
    // Check that a SaslAuthenticator can be provided by the configured
    // IAuthenticator. If not, don't start the server.
    IAuthenticator authenticator = DatabaseDescriptor.getAuthenticator();
    if (authenticator.requireAuthentication() && !(authenticator instanceof ISaslAwareAuthenticator))
    {
        logger.error("Not starting native transport as the configured IAuthenticator is not capable of SASL authentication");
        isRunning.compareAndSet(true, false);
        return;
    }

    // Configure the server.
    eventExecutorGroup = new RequestThreadPoolExecutor();


    boolean hasEpoll = enableEpoll ? Epoll.isAvailable() : false;
    if (hasEpoll)
    {
        workerGroup = new EpollEventLoopGroup();
        logger.info("Netty using native Epoll event loop");
    }
    else
    {
        workerGroup = new NioEventLoopGroup();
        logger.info("Netty using Java NIO event loop");
    }

    ServerBootstrap bootstrap = new ServerBootstrap()
                                .group(workerGroup)
                                .channel(hasEpoll ? EpollServerSocketChannel.class : NioServerSocketChannel.class)
                                .childOption(ChannelOption.TCP_NODELAY, true)
                                .childOption(ChannelOption.SO_LINGER, 0)
                                .childOption(ChannelOption.SO_KEEPALIVE, DatabaseDescriptor.getRpcKeepAlive())
                                .childOption(ChannelOption.ALLOCATOR, CBUtil.allocator)
                                .childOption(ChannelOption.WRITE_BUFFER_HIGH_WATER_MARK, 32 * 1024)
                                .childOption(ChannelOption.WRITE_BUFFER_LOW_WATER_MARK, 8 * 1024);

    final EncryptionOptions.ClientEncryptionOptions clientEnc = DatabaseDescriptor.getClientEncryptionOptions();
    if (clientEnc.enabled)
    {
        logger.info("Enabling encrypted CQL connections between client and server");
        bootstrap.childHandler(new SecureInitializer(this, clientEnc));
    }
    else
    {
        bootstrap.childHandler(new Initializer(this));
    }

    // Bind and start to accept incoming connections.
    logger.info("Using Netty Version: {}", Version.identify().entrySet());
    logger.info("Starting listening for CQL clients on {}...", socket);

    ChannelFuture bindFuture = bootstrap.bind(socket);
    if (!bindFuture.awaitUninterruptibly().isSuccess())
        throw new IllegalStateException(String.format("Failed to bind port %d on %s.", socket.getPort(), socket.getAddress().getHostAddress()));

    connectionTracker.allChannels.add(bindFuture.channel());
    isRunning.set(true);
}