io.netty.channel.kqueue.KQueueDatagramChannel#io.netty.channel.epoll.EpollDatagramChannel源码实例Demo

private CompletableFuture<Bootstrap> setupNetty(InetSocketAddress address, ChannelHandler handler) {
    var future = new CompletableFuture<Bootstrap>();

    var bootstrap = new Bootstrap()
            .group(vertx.nettyEventLoopGroup());

    if (Epoll.isAvailable()) {
        logger.info("epoll support is available, using it for UDP connections.");
        bootstrap.channel(EpollDatagramChannel.class);
    } else {
        logger.info("epoll unavailable, falling back to NIO.");
        bootstrap.channel(NioDatagramChannel.class);
    }

    bootstrap.option(ChannelOption.SO_REUSEADDR, true);
    bootstrap.option(ChannelOption.IP_TOS, 0x10 | 0x08); // IPTOS_LOWDELAY | IPTOS_THROUGHPUT
    bootstrap.handler(handler).connect(address).addListener(res -> {
        if (res.isSuccess()) {
            future.complete(bootstrap);
        } else {
            future.completeExceptionally(res.cause());
        }
    });

    return future;
}
 

public UDPServerSocket(ThreadedLogger logger, int port, String interfaz) {
    this.logger = logger;
    try {
            bootstrap = new Bootstrap()
                    .channel(EPOLL ? EpollDatagramChannel.class : NioDatagramChannel.class)
                    .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                    .handler(this)
                    .group(EPOLL ? new EpollEventLoopGroup() : new NioEventLoopGroup());
            this.logger.info("Epoll Status is " + EPOLL);
        channel = bootstrap.bind(interfaz, port).sync().channel();
    } catch (Exception e) {
        this.logger.critical("**** FAILED TO BIND TO " + interfaz + ":" + port + "!");
        this.logger.critical("Perhaps a server is already running on that port?");
        System.exit(1);
    }
}
 

public UdpServerChannel(int ioThreads) {
	if (ioThreads < 1) {
		throw new IllegalArgumentException("IO threads cound can't be less than 1");
	}
	boolean epollAvailabe = Epoll.isAvailable();
	if (!epollAvailabe) {
		ioThreads = 1;
	}
	group = epollAvailabe ? new EpollEventLoopGroup(ioThreads) : new NioEventLoopGroup(ioThreads);
	Class<? extends DatagramChannel> channel = epollAvailabe ? EpollDatagramChannel.class : NioDatagramChannel.class;
	ChannelInitializer<Channel> initializer = new ChannelInitializer<Channel>() {
		final ReadRouteChannelHandler ioReadRoute = new ReadRouteChannelHandler();
		@Override
		protected void initChannel(Channel ioChannel) throws Exception {
			ioChannel.pipeline().addLast(ioReadRoute);
		}
	};
	while (ioThreads-- > 0) {
		Bootstrap ioBootstrap = new Bootstrap().group(group).channel(channel).handler(initializer);
		if (epollAvailabe) {
			ioBootstrap.option(UnixChannelOption.SO_REUSEPORT, true);
		}
		ioBootstraps.add(ioBootstrap);
	}
}
 

@Override
@SuppressWarnings("unchecked")
public <CHANNEL extends Channel> CHANNEL getChannel(Class<CHANNEL> channelClass) {
	if (channelClass.equals(SocketChannel.class)) {
		return (CHANNEL) new EpollSocketChannel();
	}
	if (channelClass.equals(ServerSocketChannel.class)) {
		return (CHANNEL) new EpollServerSocketChannel();
	}
	if (channelClass.equals(DatagramChannel.class)) {
		return (CHANNEL) new EpollDatagramChannel();
	}
	if (channelClass.equals(DomainSocketChannel.class)) {
		return (CHANNEL) new EpollDomainSocketChannel();
	}
	if (channelClass.equals(ServerDomainSocketChannel.class)) {
		return (CHANNEL) new EpollServerDomainSocketChannel();
	}
	throw new IllegalArgumentException("Unsupported channel type: " + channelClass.getSimpleName());
}
 

public UDPServerSocket(ThreadedLogger logger, int port, String interfaz) {
    this.logger = logger;
    try {
        if (Epoll.isAvailable()) {
            bootstrap = new Bootstrap()
                    .channel(EpollDatagramChannel.class)
                    .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                    .handler(this)
                    .group(new EpollEventLoopGroup());
            this.logger.info("Epoll is available. EpollEventLoop will be used.");
        } else {
            bootstrap = new Bootstrap()
                    .group(new NioEventLoopGroup())
                    .channel(NioDatagramChannel.class)
                    .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                    .handler(this);
            this.logger.info("Epoll is unavailable. Reverting to NioEventLoop.");
        }
        channel = bootstrap.bind(interfaz, port).sync().channel();
    } catch (Exception e) {
        this.logger.critical("**** FAILED TO BIND TO " + interfaz + ":" + port + "!");
        this.logger.critical("Perhaps a server is already running on that port?");
        System.exit(1);
    }
}
 

/**
 * Returns the correct {@link Class} to use with the given {@link EventLoopGroup}.
 *
 * @param group the {@link EventLoopGroup} for which the class is needed
 * @return the class that should be used for bootstrapping
 */
public static Class<? extends DatagramChannel> datagramChannel(EventLoopGroup group) {
    if (useEpoll(group)) {
        return EpollDatagramChannel.class;
    } else if (useKQueue(group)) {
        return KQueueDatagramChannel.class;
    } else {
        return NioDatagramChannel.class;
    }
}
 

@SuppressWarnings("unused")
private void createEpollServer(Listener listener) {
    EpollEventLoopGroup eventLoopGroup = new EpollEventLoopGroup(
            1, new DefaultThreadFactory(ThreadNames.T_GATEWAY_WORKER)
    );
    eventLoopGroup.setIoRatio(100);
    createServer(listener, eventLoopGroup, EpollDatagramChannel::new);
}
 

@Override
@SuppressWarnings("unchecked")
public <CHANNEL extends Channel> Class<? extends CHANNEL> getChannelClass(Class<CHANNEL> channelClass) {
	if (channelClass.equals(SocketChannel.class)) {
		return (Class<? extends CHANNEL>) EpollSocketChannel.class;
	}
	if (channelClass.equals(ServerSocketChannel.class)) {
		return (Class<? extends CHANNEL>) EpollServerSocketChannel.class;
	}
	if (channelClass.equals(DatagramChannel.class)) {
		return (Class<? extends CHANNEL>) EpollDatagramChannel.class;
	}
	throw new IllegalArgumentException("Unsupported channel type: " + channelClass.getSimpleName());
}
 

public static Class<? extends DatagramChannel> getDatagramChannelClass(EventLoopGroup eventLoopGroup) {
    if (eventLoopGroup instanceof EpollEventLoopGroup) {
        return EpollDatagramChannel.class;
    } else {
        return NioDatagramChannel.class;
    }
}
 

private RedisClient(RedisClientConfig config) {
    RedisClientConfig copy = new RedisClientConfig(config);
    if (copy.getTimer() == null) {
        copy.setTimer(new HashedWheelTimer());
        hasOwnTimer = true;
    }
    if (copy.getGroup() == null) {
        copy.setGroup(new NioEventLoopGroup());
        hasOwnGroup = true;
    }
    if (copy.getExecutor() == null) {
        copy.setExecutor(Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 2));
        hasOwnExecutor = true;
    }
    if (copy.getResolverGroup() == null) {
        if (config.getSocketChannelClass() == EpollSocketChannel.class) {
            copy.setResolverGroup(new DnsAddressResolverGroup(EpollDatagramChannel.class, DnsServerAddressStreamProviders.platformDefault()));
        } else {
            copy.setResolverGroup(new DnsAddressResolverGroup(NioDatagramChannel.class, DnsServerAddressStreamProviders.platformDefault()));
        }
        hasOwnResolver = true;
    }

    this.config = copy;
    this.executor = copy.getExecutor();
    this.timer = copy.getTimer();
    
    uri = copy.getAddress();
    resolvedAddr = copy.getAddr();
    
    if (resolvedAddr != null) {
        resolvedAddrFuture.set(RedissonPromise.newSucceededFuture(resolvedAddr));
    }
    
    channels = new DefaultChannelGroup(copy.getGroup().next()); 
    bootstrap = createBootstrap(copy, Type.PLAIN);
    pubSubBootstrap = createBootstrap(copy, Type.PUBSUB);
    
    this.commandTimeout = copy.getCommandTimeout();
}
 

/**
 * Initializes event loop group.
 */
private void initEventLoopGroup() {

    // try to use EpollEventLoopGroup if possible,
    // if OS does not support native Epoll, fallback to use netty NIO
    try {
        eventLoopGroup = new EpollEventLoopGroup();
        channelClass = EpollDatagramChannel.class;
    } catch (NoClassDefFoundError e) {
        log.debug("Failed to initialize native (epoll) transport. "
                    + "Reason: {}. Proceeding with NIO event group.", e);
    }
    eventLoopGroup = new NioEventLoopGroup();
    channelClass = NioDatagramChannel.class;
}
 

protected MasterSlaveConnectionManager(Config cfg, UUID id) {
    this.id = id.toString();
    Version.logVersion();

    if (cfg.getTransportMode() == TransportMode.EPOLL) {
        if (cfg.getEventLoopGroup() == null) {
            this.group = new EpollEventLoopGroup(cfg.getNettyThreads(), new DefaultThreadFactory("redisson-netty"));
        } else {
            this.group = cfg.getEventLoopGroup();
        }

        this.socketChannelClass = EpollSocketChannel.class;
        if (PlatformDependent.isAndroid()) {
            this.resolverGroup = DefaultAddressResolverGroup.INSTANCE;
        } else {
            this.resolverGroup = cfg.getAddressResolverGroupFactory().create(EpollDatagramChannel.class, DnsServerAddressStreamProviders.platformDefault());
        }
    } else if (cfg.getTransportMode() == TransportMode.KQUEUE) {
        if (cfg.getEventLoopGroup() == null) {
            this.group = new KQueueEventLoopGroup(cfg.getNettyThreads(), new DefaultThreadFactory("redisson-netty"));
        } else {
            this.group = cfg.getEventLoopGroup();
        }

        this.socketChannelClass = KQueueSocketChannel.class;
        if (PlatformDependent.isAndroid()) {
            this.resolverGroup = DefaultAddressResolverGroup.INSTANCE;
        } else {
            this.resolverGroup = cfg.getAddressResolverGroupFactory().create(KQueueDatagramChannel.class, DnsServerAddressStreamProviders.platformDefault());
        }
    } else {
        if (cfg.getEventLoopGroup() == null) {
            this.group = new NioEventLoopGroup(cfg.getNettyThreads(), new DefaultThreadFactory("redisson-netty"));
        } else {
            this.group = cfg.getEventLoopGroup();
        }

        this.socketChannelClass = NioSocketChannel.class;
        if (PlatformDependent.isAndroid()) {
            this.resolverGroup = DefaultAddressResolverGroup.INSTANCE;
        } else {
            this.resolverGroup = cfg.getAddressResolverGroupFactory().create(NioDatagramChannel.class, DnsServerAddressStreamProviders.platformDefault());
        }
    }
    
    if (cfg.getExecutor() == null) {
        int threads = Runtime.getRuntime().availableProcessors() * 2;
        if (cfg.getThreads() != 0) {
            threads = cfg.getThreads();
        }
        executor = Executors.newFixedThreadPool(threads, new DefaultThreadFactory("redisson"));
    } else {
        executor = cfg.getExecutor();
    }

    this.cfg = cfg;
    this.codec = cfg.getCodec();
    this.commandExecutor = new CommandSyncService(this);
}