MqttHeartBeatClient Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/mqtt/heartBeat/MqttHeartBeatClient.java lines 32–66

public final class MqttHeartBeatClient {
    private MqttHeartBeatClient() {
    }

    private static final String HOST = System.getProperty("host", "127.0.0.1");
    private static final int PORT = Integer.parseInt(System.getProperty("port", "1883"));
    private static final String CLIENT_ID = System.getProperty("clientId", "guestClient");
    private static final String USER_NAME = System.getProperty("userName", "guest");
    private static final String PASSWORD = System.getProperty("password", "guest");

    public static void main(String[] args) throws Exception {
        EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());

        try {
            Bootstrap b = new Bootstrap();
            b.group(group);
            b.channel(NioSocketChannel.class);
            b.handler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ch.pipeline().addLast("encoder", MqttEncoder.INSTANCE);
                    ch.pipeline().addLast("decoder", new MqttDecoder());
                    ch.pipeline().addLast("heartBeatHandler", new IdleStateHandler(0, 20, 0, TimeUnit.SECONDS));
                    ch.pipeline().addLast("handler", new MqttHeartBeatClientHandler(CLIENT_ID, USER_NAME, PASSWORD));
                }
            });

            ChannelFuture f = b.connect(HOST, PORT).sync();
            System.out.println("Client connected");
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}