Multiple inheritance, why why why....

[Taylor Dondich]

Haha.  Pretty much, I was just venting.  Obviously the configuration
tool needs to make sure it works properly with Nagios.  I just feel
like the multiple inheritance situation is easy to shoot yourself in
the foot.

Just for history, I wrote Fruity, a configuration tool for Nagios,
which is used quite a bit.  I didn't think of it as "half-complete",
but there's some back history on why it hasnt' been updated (previous
employer garbage).  I'm rewriting the tool as Nagios 3 support, and it
is not, for sure, half complete.  It has support for the sophisticated
time periods, dependencies, escalations, multiple inheritance.  It has
a rich importing and export system and the first release may have the
full auto-discovery feature built-in.  I plan on it being complete
around late this weekend.  The UI is complete, the backend is as well.
 Just the import and export engine are being finalized.

Taylor

On Wed, Aug 20, 2008 at 10:36 PM, Hendrik Bäcker
<andurin at process-zero.de> wrote:
> Hi Taylor,
>
> Taylor Dondich schrieb:
>> First off, was there REALLY a need for multiple inheritance?  It's
>> something that I think would REALLY stab you in the foot.  With a well
>> planned template structure with single inheritance, I'd think you'd
>> resolve any issue.   However, because we have it, it's good to
>> understand it.
>>
>> Does anyone want to explain to me WHY it was chosen that the
>> precedence order of variables go from left to right, instead of right
>> to left?  I mean, if you have the following:
>>
>> define host {
>>   host_name testhost
>>   use templatea, templateb
>> }
>>
>> And both templates have different values for check_interval.  That the
>> value in templatea is the one used instead of the one from templateb.
>> That's how the docs describe it.  Does it make sense to most people
>> that this is "correct" or would you think it'd be the other way?
>>
> Left to right, right to left where's the different if you know how it
> works? Something had to be choosen so the devels might thought: "First
> come, first serve" might be a good thing.
> >From left to right, the configuration (wo)men only must think off: "The
> first directive set will be taken from a template, but it can be
> overwritten be the atomic service object".
>
> But I see there would be a logic for the other way too: "generic-service
> for all, then the closer special ones" - but anyway: I would say it's to
> late to discuss this. Many people out there has already Nagios3, they
> might alreade use multiple inheritance in the actual way.
>> I'm writing a configuration tool and visually it's a vertical list, so
>> my idea is that the bottom level template overrides any values from
>> upper templates.  It just seems weird.
>>
> 1. Please not another config tool - there are too many half ready tools
> out there.
> 2. Who must change in your opinion? Nagios to your config tool or vice
> versa? (SCNR)
>
> Regards,
> Hendrik
>
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