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<H1>[99s-extend] Mandatory init/3 and optional handle/2 and terminate/3</H1>
<B>Paulo F. Oliveira</B>
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TITLE="[99s-extend] Mandatory init/3 and optional handle/2 and terminate/3">paulo.ferraz.oliveira at gmail.com
</A><BR>
<I>Thu Jun 5 01:49:01 CEST 2014</I>
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<PRE>Got it, thanks.
This here <<A HREF="http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/">http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/</A>> had
the fine print that I hadn't read apparently: "This module cannot be
described as a behaviour due to most of the callbacks it defines being
optional. It has the same semantics as a behaviour otherwise."
- Paulo F. Oliveira
On 4 June 2014 22:46, Loïc Hoguin <<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>> wrote:
><i> You shouldn't say -behavior(cowboy_http_handler) if you don't actually
</I>><i> implement it.
</I>><i>
</I>><i> On 06/04/2014 11:37 PM, Paulo F. Oliveira wrote:
</I>><i>
</I>>><i> Hello.
</I>>><i>
</I>>><i> You wrote here
</I>>><i> <<A HREF="http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/">http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/</A>> that "The
</I>>><i>
</I>>><i> only mandatory callback is init/3, needed to perform the protocol
</I>>><i> upgrade."
</I>>><i>
</I>>><i> In my code I have only this function for the protocol upgrade:
</I>>><i>
</I>>><i> init({_TransportName, _ProtocolName}, _Req, []) ->
</I>>><i> {upgrade, protocol, cowboy_rest}.
</I>>><i>
</I>>><i> On the other hand, when compiling, I get the following warnings:
</I>>><i>
</I>>><i> src/handler_transactions.erl:3: Warning: undefined callback function
</I>>><i> handle/2 (behaviour 'cowboy_http_handler')
</I>>><i> src/handler_transactions.erl:3: Warning: undefined callback function
</I>>><i> terminate/3 (behaviour 'cowboy_http_handler')
</I>>><i>
</I>>><i> Is this the expected behavior? I know I _can_ ignore the warnings, but
</I>>><i> not if I want to use Erlang compiler option warnings_as_errors, for
</I>>><i> example.
</I>>><i>
</I>>><i> Many thanks.
</I>>><i>
</I>>><i> - Paulo F. Oliveira
</I>>><i>
</I>>><i>
</I>>><i> _______________________________________________
</I>>><i> Extend mailing list
</I>>><i> <A HREF="https://lists.ninenines.eu/listinfo/extend">Extend at lists.ninenines.eu</A>
</I>>><i> <A HREF="https://lists.ninenines.eu/listinfo/extend">https://lists.ninenines.eu/listinfo/extend</A>
</I>>><i>
</I>>><i>
</I>><i> --
</I>><i> Loïc Hoguin
</I>><i> <A HREF="http://ninenines.eu">http://ninenines.eu</A>
</I>><i>
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