A small enhancement to ReplayingDecoder

["이희승 (Trustin Lee)"]

Hi Bruno,

Same thing can be achieved by using checkpoint(enum) and a counter
member variable, no?

public class MyDecoder extends ReplayingDecoder {

    int nParams;

    public void decode (...) {
        switch (state) {
        case PARAM_CNT:
            nParams = ...;
            checkpoint(PARAM_SIZE);
        case PARAM_SIZE:
            param = new byte[...];
            checkpoint(PARAM_VALUE);
        case PARAM_VALUE:
            params.add(...);
            if (this.params.size() >= this.nParams) {
                checkpoint(PARAM_CNT);
            } else {
                checkpoint(PARAM_SIZE);
            }
            break;
        }
    }
}

Bruno de Carvalho wrote:
> Hey y'all,
> 
> 
> Since I've subscribed to this mailing list I've seen at least a couple
> of some people struggling with ReplayingDecoder to handle complex
> message structures, mainly when integrating with legacy protocols where
> the message structure is dynamic, sometimes even with repeating fields.
> 
> I've had such an experience recently and I came up with this little
> helper.
> 
> http://bruno.factor45.org/blag/2010/08/21/an-enhanced-version-of-replayingdecoder-for-netty/
> 
> Hope this helps someone out there as well!
> 
> 
> Cheers,
>   Bruno
> 
> _______________________________________________
> netty-users mailing list
> netty-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/netty-users

-- 
Trustin Lee - http://gleamynode.net/


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