RelayHandler Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/socksproxy/RelayHandler.java lines 24–58

public final class RelayHandler extends ChannelInboundHandlerAdapter {

    private final Channel relayChannel;

    public RelayHandler(Channel relayChannel) {
        this.relayChannel = relayChannel;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (relayChannel.isActive()) {
            relayChannel.writeAndFlush(msg);
        } else {
            ReferenceCountUtil.release(msg);
        }
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        if (relayChannel.isActive()) {
            SocksServerUtils.closeOnFlush(relayChannel);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}