DiscardClientHandler Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/discard/DiscardClientHandler.java lines 26–75

public class DiscardClientHandler extends SimpleChannelInboundHandler<Object> {

    private ByteBuf content;
    private ChannelHandlerContext ctx;

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        this.ctx = ctx;

        // Initialize the message.
        content = ctx.alloc().directBuffer(DiscardClient.SIZE).writeZero(DiscardClient.SIZE);

        // Send the initial messages.
        generateTraffic();
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        content.release();
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
        // Server is supposed to send nothing, but if it sends something, discard it.
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        cause.printStackTrace();
        ctx.close();
    }

    long counter;

    private void generateTraffic() {
        // Flush the outbound buffer to the socket.
        // Once flushed, generate the same amount of traffic again.
        ctx.writeAndFlush(content.retainedDuplicate()).addListener(trafficGenerator);
    }

    private final ChannelFutureListener trafficGenerator = future -> {
        if (future.isSuccess()) {
            generateTraffic();
        } else {
            future.cause().printStackTrace();
            future.channel().close();
        }
    };
}