dubbo笔记-remoting(2)Netty实现

接上篇
dubbo笔记-remoting(1)

1.Channel

1.1 AbstractChannel

AbstractChannel基本没做什么

public abstract class AbstractChannel extends AbstractPeer implements Channel {

    public AbstractChannel(URL url, ChannelHandler handler) {
        super(url, handler);
    }

    @Override
    public void send(Object message, boolean sent) throws RemotingException {
        if (isClosed()) {
            throw new RemotingException(this, "Failed to send message "
                    + (message == null ? "" : message.getClass().getName()) + ":" + message
                    + ", cause: Channel closed. channel: " + getLocalAddress() + " -> " + getRemoteAddress());
        }
    }

    @Override
    public String toString() {
        return getLocalAddress() + " -> " + getRemoteAddress();
    }

}

1.2 NettyChannel

其内部实现由io.netty.channel.Channel完成,attribute则由attributes完成

final class NettyChannel extends AbstractChannel {

    private static final Logger logger = LoggerFactory.getLogger(NettyChannel.class);

    private final Channel channel;

    private final Map<String, Object> attributes = new ConcurrentHashMap<String, Object>();

    private NettyChannel(Channel channel, URL url, ChannelHandler handler) {
        super(url, handler);
        if (channel == null) {
            throw new IllegalArgumentException("netty channel == null;");
        }
        this.channel = channel;
    }
}

2.Server

2.1 AbstractServer

AbstractServer实现了默认的Server接口,并从URL中获取了很多必要的信息,构造函数就是一个模板方法,将doOpen方法留给子类实现

public abstract class AbstractServer extends AbstractEndpoint implements Server {

    protected static final String SERVER_THREAD_POOL_NAME = "DubboServerHandler";
    private static final Logger logger = LoggerFactory.getLogger(AbstractServer.class);
    ExecutorService executor;
    private InetSocketAddress localAddress;
    private InetSocketAddress bindAddress;
    private int accepts;
    private int idleTimeout = 600; //600 seconds

    public AbstractServer(URL url, ChannelHandler handler) throws RemotingException {
        super(url, handler);
        localAddress = getUrl().toInetSocketAddress();

        String bindIp = getUrl().getParameter(Constants.BIND_IP_KEY, getUrl().getHost());
        int bindPort = getUrl().getParameter(Constants.BIND_PORT_KEY, getUrl().getPort());
        if (url.getParameter(Constants.ANYHOST_KEY, false) || NetUtils.isInvalidLocalHost(bindIp)) {
            bindIp = NetUtils.ANYHOST;
        }
        bindAddress = new InetSocketAddress(bindIp, bindPort);
        this.accepts = url.getParameter(Constants.ACCEPTS_KEY, Constants.DEFAULT_ACCEPTS);
        this.idleTimeout = url.getParameter(Constants.IDLE_TIMEOUT_KEY, Constants.DEFAULT_IDLE_TIMEOUT);
        try {
            doOpen();
            if (logger.isInfoEnabled()) {
                logger.info("Start " + getClass().getSimpleName() + " bind " + getBindAddress() + ", export " + getLocalAddress());
            }
        } catch (Throwable t) {
            throw new RemotingException(url.toInetSocketAddress(), null, "Failed to bind " + getClass().getSimpleName()
                    + " on " + getLocalAddress() + ", cause: " + t.getMessage(), t);
        }
        //fixme replace this with better method
        DataStore dataStore = ExtensionLoader.getExtensionLoader(DataStore.class).getDefaultExtension();
        executor = (ExecutorService) dataStore.get(Constants.EXECUTOR_SERVICE_COMPONENT_KEY, Integer.toString(url.getPort()));
    }
}

2.2 NettyServer

NettyServer是真正启动Netty的Server端的流程

public class NettyServer extends AbstractServer implements Server {

    private static final Logger logger = LoggerFactory.getLogger(NettyServer.class);

    private Map<String, Channel> channels; // <ip:port, channel>

    private ServerBootstrap bootstrap;

    private io.netty.channel.Channel channel;

    private EventLoopGroup bossGroup;
    private EventLoopGroup workerGroup;

    public NettyServer(URL url, ChannelHandler handler) throws RemotingException {
        super(url, ChannelHandlers.wrap(handler, ExecutorUtil.setThreadName(url, SERVER_THREAD_POOL_NAME)));
    }

    @Override
    protected void doOpen() throws Throwable {
        NettyHelper.setNettyLoggerFactory();

        bootstrap = new ServerBootstrap();

        bossGroup = new NioEventLoopGroup(1, new DefaultThreadFactory("NettyServerBoss", true));
        workerGroup = new NioEventLoopGroup(getUrl().getPositiveParameter(Constants.IO_THREADS_KEY, Constants.DEFAULT_IO_THREADS),
                new DefaultThreadFactory("NettyServerWorker", true));

        final NettyServerHandler nettyServerHandler = new NettyServerHandler(getUrl(), this);
        channels = nettyServerHandler.getChannels();

        bootstrap.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .childOption(ChannelOption.TCP_NODELAY, Boolean.TRUE)
                .childOption(ChannelOption.SO_REUSEADDR, Boolean.TRUE)
                .childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                .childHandler(new ChannelInitializer<NioSocketChannel>() {
                    @Override
                    protected void initChannel(NioSocketChannel ch) throws Exception {
                        NettyCodecAdapter adapter = new NettyCodecAdapter(getCodec(), getUrl(), NettyServer.this);
                        ch.pipeline()//.addLast("logging",new LoggingHandler(LogLevel.INFO))//for debug
                                .addLast("decoder", adapter.getDecoder())
                                .addLast("encoder", adapter.getEncoder())
                                .addLast("handler", nettyServerHandler);
                    }
                });
        // bind
        ChannelFuture channelFuture = bootstrap.bind(getBindAddress());
        channelFuture.syncUninterruptibly();
        channel = channelFuture.channel();

    }
}

3.Client

3.1 AbstractClient

类似AbstractServer,AbstractClient也是一个模板类, doOpen方法留给子类实现

public abstract class AbstractClient extends AbstractEndpoint implements Client {

    protected static final String CLIENT_THREAD_POOL_NAME = "DubboClientHandler";
    private static final Logger logger = LoggerFactory.getLogger(AbstractClient.class);
    private static final AtomicInteger CLIENT_THREAD_POOL_ID = new AtomicInteger();
    private static final ScheduledThreadPoolExecutor reconnectExecutorService = new ScheduledThreadPoolExecutor(2, new NamedThreadFactory("DubboClientReconnectTimer", true));
    private final Lock connectLock = new ReentrantLock();
    private final boolean send_reconnect;
    private final AtomicInteger reconnect_count = new AtomicInteger(0);
    // Reconnection error log has been called before?
    private final AtomicBoolean reconnect_error_log_flag = new AtomicBoolean(false);
    // reconnect warning period. Reconnect warning interval (log warning after how many times) //for test
    private final int reconnect_warning_period;
    private final long shutdown_timeout;
    protected volatile ExecutorService executor;
    private volatile ScheduledFuture<?> reconnectExecutorFuture = null;
    // the last successed connected time
    private long lastConnectedTime = System.currentTimeMillis();


    public AbstractClient(URL url, ChannelHandler handler) throws RemotingException {
        super(url, handler);

        send_reconnect = url.getParameter(Constants.SEND_RECONNECT_KEY, false);

        shutdown_timeout = url.getParameter(Constants.SHUTDOWN_TIMEOUT_KEY, Constants.DEFAULT_SHUTDOWN_TIMEOUT);

        // The default reconnection interval is 2s, 1800 means warning interval is 1 hour.
        reconnect_warning_period = url.getParameter("reconnect.waring.period", 1800);

        try {
            doOpen();
        } catch (Throwable t) {
            close();
            throw new RemotingException(url.toInetSocketAddress(), null,
                    "Failed to start " + getClass().getSimpleName() + " " + NetUtils.getLocalAddress()
                            + " connect to the server " + getRemoteAddress() + ", cause: " + t.getMessage(), t);
        }
        try {
            // connect.
            connect();
            if (logger.isInfoEnabled()) {
                logger.info("Start " + getClass().getSimpleName() + " " + NetUtils.getLocalAddress() + " connect to the server " + getRemoteAddress());
            }
        } catch (RemotingException t) {
            if (url.getParameter(Constants.CHECK_KEY, true)) {
                close();
                throw t;
            } else {
                logger.warn("Failed to start " + getClass().getSimpleName() + " " + NetUtils.getLocalAddress()
                        + " connect to the server " + getRemoteAddress() + " (check == false, ignore and retry later!), cause: " + t.getMessage(), t);
            }
        } catch (Throwable t) {
            close();
            throw new RemotingException(url.toInetSocketAddress(), null,
                    "Failed to start " + getClass().getSimpleName() + " " + NetUtils.getLocalAddress()
                            + " connect to the server " + getRemoteAddress() + ", cause: " + t.getMessage(), t);
        }

        executor = (ExecutorService) ExtensionLoader.getExtensionLoader(DataStore.class)
                .getDefaultExtension().get(Constants.CONSUMER_SIDE, Integer.toString(url.getPort()));
        ExtensionLoader.getExtensionLoader(DataStore.class)
                .getDefaultExtension().remove(Constants.CONSUMER_SIDE, Integer.toString(url.getPort()));
    }
}

3.2 NettyClient

同样NettyClient也是Netty的Client实现

public class NettyClient extends AbstractClient {

    private static final Logger logger = LoggerFactory.getLogger(NettyClient.class);

    private static final NioEventLoopGroup nioEventLoopGroup = new NioEventLoopGroup(Constants.DEFAULT_IO_THREADS, new DefaultThreadFactory("NettyClientWorker", true));

    private Bootstrap bootstrap;

    private volatile Channel channel; // volatile, please copy reference to use

    public NettyClient(final URL url, final ChannelHandler handler) throws RemotingException {
        super(url, wrapChannelHandler(url, handler));
    }

    @Override
    protected void doOpen() throws Throwable {
        NettyHelper.setNettyLoggerFactory();
        final NettyClientHandler nettyClientHandler = new NettyClientHandler(getUrl(), this);
        bootstrap = new Bootstrap();
        bootstrap.group(nioEventLoopGroup)
                .option(ChannelOption.SO_KEEPALIVE, true)
                .option(ChannelOption.TCP_NODELAY, true)
                .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                //.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, getTimeout())
                .channel(NioSocketChannel.class);

        if (getTimeout() < 3000) {
            bootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 3000);
        } else {
            bootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, getTimeout());
        }

        bootstrap.handler(new ChannelInitializer() {

            @Override
            protected void initChannel(Channel ch) throws Exception {
                NettyCodecAdapter adapter = new NettyCodecAdapter(getCodec(), getUrl(), NettyClient.this);
                ch.pipeline()//.addLast("logging",new LoggingHandler(LogLevel.INFO))//for debug
                        .addLast("decoder", adapter.getDecoder())
                        .addLast("encoder", adapter.getEncoder())
                        .addLast("handler", nettyClientHandler);
            }
        });
    }
}

4.相关适配器

dubbo定义了很多的适配器,都是通过构造函数传入参数,内部实现均是代理实现

public class ClientDelegate implements Client {

    private transient Client client;

    public ClientDelegate() {
    }

    public ClientDelegate(Client client) {
        setClient(client);
    }

    public Client getClient() {
        return client;
    }

    public void setClient(Client client) {
        if (client == null) {
            throw new IllegalArgumentException("client == null");
        }
        this.client = client;
    }

    @Override
    public void reset(URL url) {
        client.reset(url);
    }

    @Override
    @Deprecated
    public void reset(com.alibaba.dubbo.common.Parameters parameters) {
        reset(getUrl().addParameters(parameters.getParameters()));
    }

    @Override
    public URL getUrl() {
        return client.getUrl();
    }

    @Override
    public InetSocketAddress getRemoteAddress() {
        return client.getRemoteAddress();
    }

    @Override
    public void reconnect() throws RemotingException {
        client.reconnect();
    }
}
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