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Re: [T2TRG] OCF Observe on special interfaces, design question, RFC requirements?

Michael Koster <michaeljohnkoster@gmail.com> Wed, 10 July 2019 00:12 UTC

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From: Michael Koster <michaeljohnkoster@gmail.com>
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Date: Tue, 09 Jul 2019 17:11:58 -0700
In-Reply-To: <59F4C3E9-1400-4A75-B915-69BC27E0FE7E@smartthings.com>
Cc: Klaus Hartke <hartke@projectcool.de>, "t2trg@irtf.org" <t2trg@irtf.org>, core <core@ietf.org>
To: Michael Koster <michael.koster@smartthings.com>
References: <166B0435-8C96-4B83-98CB-A1D6F0838335@smartthings.com> <CAAzbHvYGVtNiw5taGMaVVRe4RuN9s2y4Y6RkJxR06Nk=w3CiTQ@mail.gmail.com> <E74FBEFC-D7CA-48E4-BB71-6031BAB830FA@gmail.com> <59F4C3E9-1400-4A75-B915-69BC27E0FE7E@smartthings.com>
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Subject: Re: [T2TRG] OCF Observe on special interfaces, design question, RFC requirements?
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More formally, the observed (projected) resource, referenced through an alternate URL, would be a log of recent activity on the base resource, with a maximum depth of one. 

Is it a satisfactory definition?

> On Jul 9, 2019, at 5:08 PM, Michael Koster <michael.koster@smartthings.com> wrote:
> 
> Hi Klaus,
> 
> What if we retained the last notified state such that it would also be returned by polling?
> 
>> On Jul 9, 2019, at 4:34 PM, Michael Koster <michaeljohnkoster@gmail.com <mailto:michaeljohnkoster@gmail.com>> wrote:
>> 
>> Thank you, Klaus.
>> 
>>> On Jul 9, 2019, at 3:24 PM, Klaus Hartke <hartke@projectcool.de <mailto:hartke@projectcool.de>> wrote:
>>> 
>>> When observing a resource with a rather large representation, it might
>>> often make more sense to observe a projection of that resource. That
>>> is, to observe a resource X whose state depends on the state of
>>> another resource Y.
>> 
>> This is already the intention with providing the alternate URI through the use of the query parameter. It is a different resource which is a projection of the state of the base resource.
>> 
>> klaus> * The state of X is a list of the last 10 additions/removals to that list.
>> 
>> Or perhaps the last one addition or removal...
>> 
>> What we are doing is not that different.
>> 
>> Best regards,
>> 
>> Michael
>> 
>> 
>

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