UptimeClient Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/uptime/UptimeClient.java lines 33–67

public final class UptimeClient {

    static final String HOST = System.getProperty("host", "127.0.0.1");
    static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
    // Sleep 5 seconds before a reconnection attempt.
    static final int RECONNECT_DELAY = Integer.parseInt(System.getProperty("reconnectDelay", "5"));
    // Reconnect when the server sends nothing for 10 seconds.
    private static final int READ_TIMEOUT = Integer.parseInt(System.getProperty("readTimeout", "10"));

    private static final UptimeClientHandler handler = new UptimeClientHandler();
    private static final Bootstrap bs = new Bootstrap();

    public static void main(String[] args) throws Exception {
        EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
        bs.group(group)
                .channel(NioSocketChannel.class)
                .remoteAddress(HOST, PORT)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ch.pipeline().addLast(new IdleStateHandler(READ_TIMEOUT, 0, 0), handler);
                    }
                });
        bs.connect();
    }

    static void connect() {
        bs.connect().addListener(future -> {
            if (future.cause() != null) {
                handler.startTime = -1;
                handler.println("Failed to connect: " + future.cause());
            }
        });
    }
}