FactorialServerHandler Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/factorial/FactorialServerHandler.java lines 30–53

public class FactorialServerHandler extends SimpleChannelInboundHandler<BigInteger> {

    private BigInteger lastMultiplier = new BigInteger("1");
    private BigInteger factorial = new BigInteger("1");

    @Override
    public void channelRead0(ChannelHandlerContext ctx, BigInteger msg) throws Exception {
        // Calculate the cumulative factorial and send it to the client.
        lastMultiplier = msg;
        factorial = factorial.multiply(msg);
        ctx.writeAndFlush(factorial);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.err.printf("Factorial of %,d is: %,d%n", lastMultiplier, factorial);
    }

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